Security+ Network Security 20% (part 2)
QUESTION NO: 105 A network technician is on the phone with the system administration team. Power to the server room was lost and servers need to be restarted. The DNS services must be the first to be restarted. Several machines are powered off. Assuming each server only provides one service, which of the following should be powered on FIRST to establish DNS services? A. Bind server B. Apache server C. Exchange server D. RADIUS server
Answer: A Explanation: BIND (Berkeley Internet Name Domain) is the most widely used Domain Name System (DNS) software on the Internet. It includes the DNS server component contracted for name daemon. This is the only option that directly involves DNS.
A network administrator has been tasked with securing the WLAN. Which of the following cryptographic products would be used to provide the MOST secure environment for the WLAN? A. WPA2 CCMP B. WPA C. WPA with MAC filtering D. WPA2 TKIP
Answer: A Explanation: CCMP is the standard encryption protocol for use with the WPA2 standard and is much more secure than the WEP protocol and TKIP protocol of WPA. CCMP provides the following security services: Data confidentiality; ensures only authorized parties can access the information Authentication; provides proof of genuineness of the user Access control in conjunction with layer management Because CCMP is a block cipher mode using a 128-bit key, it is secure against attacks to the 264 steps of operation.
QUESTION NO: 171 A security administrator wishes to increase the security of the wireless network. Which of the following BEST addresses this concern? A. Change the encryption from TKIP-based to CCMP-based. B. Set all nearby access points to operate on the same channel. C. Configure the access point to use WEP instead of WPA2. D. Enable all access points to broadcast their SSIDs.
Answer: A Explanation: CCMP makes use of 128-bit AES encryption with a 48-bit initialization vector. This initialization vector makes cracking a bit more difficult.
QUESTION NO: 157 Which of the following means of wireless authentication is easily vulnerable to spoofing? A. MAC Filtering B. WPA - LEAP C. WPA - PEAP D. Enabled SSID
Answer: A Explanation: Each network interface on your computer or any other networked device has a unique MAC address. These MAC addresses are assigned in the factory, but you can easily change, or "spoof," MAC addresses in software. Networks can use MAC address filtering, only allowing devices with specific MAC addresses to connect to a network. This isn't a great security tool because people can spoof their MAC addresses.
QUESTION NO: 115 After a network outage, a PC technician is unable to ping various network devices. The network administrator verifies that those devices are working properly and can be accessed securely. Which of the following is the MOST likely reason the PC technician is unable to ping those devices? A. ICMP is being blocked B. SSH is not enabled C. DNS settings are wrong D. SNMP is not configured properly
Answer: A Explanation: ICMP is a protocol that is commonly used by tools such as ping, traceroute, and pathping. ICMP offers no information If ICMP request queries go unanswered, or ICMP replies are lost or blocked.
QUESTION NO: 158 Ann, a sales manager, successfully connected her company-issued smartphone to the wireless network in her office without supplying a username/password combination. Upon disconnecting from the wireless network, she attempted to connect her personal tablet computer to the same wireless network and could not connect. Which of the following is MOST likely the reason? A. The company wireless is using a MAC filter. B. The company wireless has SSID broadcast disabled. C. The company wireless is using WEP. D. The company wireless is using WPA2.
Answer: A Explanation: MAC filtering allows you to include or exclude computers and devices based on their MAC address.
QUESTION NO: 163 A security architect wishes to implement a wireless network with connectivity to the company's internal network. Before they inform all employees that this network is being put in place, the architect wants to roll it out to a small test segment. Which of the following allows for greater secrecy about this network during this initial phase of implementation? A. Disabling SSID broadcasting B. Implementing WPA2 - TKIP C. Implementing WPA2 - CCMP D. Filtering test workstations by MAC address
Answer: A Explanation: Network administrators may choose to disable SSID broadcast to hide their network from unauthorized personnel. However, the SSID is still needed to direct packets to and from the base station, so it's a discoverable value using a wireless packet sniffer. Thus, the SSID should be disabled if the network isn't for public use.
QUESTION NO: 162 An organization does not want the wireless network name to be easily discovered. Which of the following software features should be configured on the access points? A. SSID broadcast B. MAC filter C. WPA2 D. Antenna placement
Answer: A Explanation: Numerous networks broadcast their name (known as an SSID broadcast) to reveal their presence.
QUESTION NO: 138 Which of the following ports should be used by a system administrator to securely manage a remote server? A. 22 B. 69 C. 137 D. 445
Answer: A Explanation: Secure Shell (SSH) is a more secure replacement for Telnet, rlogon, rsh, and rcp. SSH can be called a remote access or remote terminal solution. SSH offers a means by which a commandline, text-only interface connection with a server, router, switch, or similar device can be established over any distance. SSH makes use of TCP port 22.
QUESTION NO: 178 After reviewing the firewall logs of her organization's wireless APs, Ann discovers an unusually high amount of failed authentication attempts in a particular segment of the building. She remembers that a new business moved into the office space across the street. Which of the following would be the BEST option to begin addressing the issue? A. Reduce the power level of the AP on the network segment B. Implement MAC filtering on the AP of the affected segment C. Perform a site survey to see what has changed on the segment D. Change the WPA2 encryption key of the AP in the affected segment
Answer: A Explanation: Some access points include power level controls that allow you to reduce the amount of output provided if the signal is traveling too far.
QUESTION NO: 168 Which of the following wireless security technologies continuously supplies new keys for WEP? A. TKIP B. Mac filtering C. WPA2 D. WPA
Answer: A Explanation: TKIP is a suite of algorithms that works as a "wrapper" to WEP, which allows users of legacy WLAN equipment to upgrade to TKIP without replacing hardware. TKIP uses the original WEP programming but "wraps" additional code at the beginning and end to encapsulate and modify it.
QUESTION NO: 118 Which of the following protocols is used by IPv6 for MAC address resolution? A. NDP B. ARP C. DNS D. NCP
Answer: A Explanation: The Neighbor Discovery Protocol (NDP) is a protocol in the Internet protocol suite used with Internet Protocol Version 6 (IPv6).
QUESTION NO: 152 Configuring key/value pairs on a RADIUS server is associated with deploying which of the following? A. WPA2-Enterprise wireless network B. DNS secondary zones C. Digital certificates D. Intrusion detection system
Answer: A Explanation: WPA2-Enterprise is designed for enterprise networks and requires a RADIUS authentication server.
QUESTION NO: 165 A company provides secure wireless Internet access for visitors and vendors working onsite. Some of the vendors using older technology report that they are unable to access the wireless network after entering the correct network information. Which of the following is the MOST likely reason for this issue? A. The SSID broadcast is disabled. B. The company is using the wrong antenna type. C. The MAC filtering is disabled on the access point. D. The company is not using strong enough encryption.
Answer: A Explanation: When the SSID is broadcast, any device with an automatic detect and connect feature is able to see the network and can initiate a connection with it. The fact that they cannot access the network means that they are unable to see it.
QUESTION NO: 174 Jane, an administrator, needs to make sure the wireless network is not accessible from the parking area of their office. Which of the following would BEST help Jane when deploying a new access point? A. Placement of antenna B. Disabling the SSID C. Implementing WPA2 D. Enabling the MAC filtering
Answer: A Explanation: You should try to avoid placing access points near metal (which includes appliances) or near the ground. Placing them in the center of the area to be served and high enough to get around most obstacles is recommended. On the chance that the signal is actually traveling too far, some access points include power level controls, which allow you to reduce the amount of output provided.
QUESTION NO: 148 Which of the following allows Pete, a security technician, to provide the MOST secure wireless implementation? A. Implement WPA B. Disable SSID C. Adjust antenna placement D. Implement WEP
Answer: A Explanation: Of the options supplied, WiFi Protected Access (WPA) is the most secure and is the replacement for WEP.
QUESTION NO: 137 Which of the following uses port 22 by default? (Select THREE). A. SSH B. SSL C. TLS D. SFTP E. SCP F. FTPS G. SMTP H. SNMP
Answer: A,D,E Explanation: SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also use TCP port 22.
QUESTION NO: 145 A technician is unable to manage a remote server. Which of the following ports should be opened on the firewall for remote server management? (Select TWO). A. 22 B. 135 C. 137 D. 143 E. 443 F. 3389
Answer: A,F Explanation: A secure remote administration solution and Remote Desktop protocol is required. Secure Shell (SSH) is a secure remote administration solution and makes use of TCP port 22. Remote Desktop Protocol (RDP) uses TCP port 3389.
QUESTION NO: 175 A security team has identified that the wireless signal is broadcasting into the parking lot. To reduce the risk of an attack against the wireless network from the parking lot, which of the following controls should be used? (Select TWO). A. Antenna placement B. Interference C. Use WEP D. Single Sign on E. Disable the SSID F. Power levels
Answer: A,F Explanation: Placing the antenna in the correct position is crucial. You can then adjust the power levels to exclude the parking lot.
QUESTION NO: 179 An administrator wants to establish a WiFi network using a high gain directional antenna with a narrow radiation pattern to connect two buildings separated by a very long distance. Which of the following antennas would be BEST for this situation? A. Dipole B. Yagi C. Sector D. Omni
Answer: B Explanation: A Yagi-Uda antenna, commonly known simply as a Yagi antenna, is a directional antenna consisting of multiple parallel dipole elements in a line, usually made of metal rods. It consists of a single driven element connected to the transmitter or receiver with a transmission line, and additional parasitic elements: a so-called reflector and one or more directors. The reflector element is slightly longer than the driven dipole, whereas the directors are a little shorter. This design achieves a very substantial increase in the antenna's directionality and gain compared to a simple dipole.
QUESTION NO: 126 A security analyst noticed a colleague typing the following command: `Telnet some-host 443' Which of the following was the colleague performing? A. A hacking attempt to the some-host web server with the purpose of achieving a distributed denial of service attack. B. A quick test to see if there is a service running on some-host TCP/443, which is being routed correctly and not blocked by a firewall. C. Trying to establish an insecure remote management session. The colleague should be using SSH or terminal services instead. D. A mistaken port being entered because telnet servers typically do not listen on port 443.
Answer: B Explanation: B: The Telnet program parameters are: telnet <hostname> <port> <hostname> is the name or IP address of the remote server to connect to. <port> is the port number of the service to use for the connection. TCP port 443 provides the HTTPS (used for secure web connections) service; it is the default SSL port. By running the Telnet some-host 443 command, the security analyst is checking that routing is done properly and not blocked by a firewall.
QUESTION NO: 170 An access point has been configured for AES encryption but a client is unable to connect to it. Which of the following should be configured on the client to fix this issue? A. WEP B. CCMP C. TKIP D. RC4
Answer: B Explanation: CCMP is an encryption protocol designed for Wireless LAN products that implement the standards of the IEEE 802.11i amendment to the original IEEE 802.11 standard. CCMP is an enhanced data cryptographic encapsulation mechanism designed for data confidentiality and based upon the Counter Mode with CBC-MAC (CCM) of the AES standard.
QUESTION NO: 172 The security administrator has been tasked to update all the access points to provide a more secure connection. All access points currently use WPA TKIP for encryption. Which of the following would be configured to provide more secure connections? A. WEP B. WPA2 CCMP C. Disable SSID broadcast and increase power levels D. MAC filtering
Answer: B Explanation: CCMP makes use of 128-bit AES encryption with a 48-bit initialization vector. This initialization vector makes cracking a bit more difficult.
QUESTION NO: 141 During the analysis of a PCAP file, a security analyst noticed several communications with a remote server on port 53. Which of the following protocol types is observed in this traffic? A. FTP B. DNS C. Email D. NetBIOS
Answer: B Explanation: DNS (Domain Name System) uses port 53.
QUESTION NO: 112 Which of the following is the MOST secure protocol to transfer files? A. FTP B. FTPS C. SSH D. TELNET
Answer: B Explanation: FTPS refers to FTP Secure, or FTP SSL. It is a secure variation of File Transfer Protocol (FTP).
QUESTION NO: 120 Pete, a network administrator, is implementing IPv6 in the DMZ. Which of the following protocols must he allow through the firewall to ensure the web servers can be reached via IPv6 from an IPv6 enabled Internet host? A. TCP port 443 and IP protocol 46 B. TCP port 80 and TCP port 443 C. TCP port 80 and ICMP D. TCP port 443 and SNMP
Answer: B Explanation: HTTP and HTTPS, which uses TCP port 80 and TCP port 443 respectively, is necessary for Communicating with Web servers. It should therefore be allowed through the firewall.
QUESTION NO: 159 After entering the following information into a SOHO wireless router, a mobile device's user reports being unable to connect to the network: PERMIT 0A: D1: FA. B1: 03: 37 DENY 01: 33: 7F: AB: 10: AB Which of the following is preventing the device from connecting? A. WPA2-PSK requires a supplicant on the mobile device. B. Hardware address filtering is blocking the device. C. TCP/IP Port filtering has been implemented on the SOHO router. D. IP address filtering has disabled the device from connecting.
Answer: B Explanation: MAC filtering allows you to include or exclude computers and devices based on their MAC address.
QUESTION NO: 139 Which of the following ports is used to securely transfer files between remote UNIX systems? A. 21 B. 22 C. 69 D. 445
Answer: B Explanation: SCP copies files securely between hosts on a network. It uses SSH for data transfer, and uses the same authentication and provides the same security as SSH. Unlike RCP, SCP will ask for passwords or passphrases if they are needed for authentication. SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also use TCP port 22.
QUESTION NO: 122 A network administrator is asked to send a large file containing PII to a business associate. Which of the following protocols is the BEST choice to use? A. SSH B. SFTP C. SMTP D. FTP
Answer: B Explanation: SFTP encrypts authentication and data traffic between the client and server by making use of SSH to provide secure FTP communications. As a result, SFTP offers protection for both the authentication traffic and the data transfer taking place between a client and server.
QUESTION NO: 101 A recent vulnerability scan found that Telnet is enabled on all network devices. Which of the following protocols should be used instead of Telnet? A. SCP B. SSH C. SFTP D. SSL
Answer: B Explanation: SSH transmits both authentication traffic and data in a secured encrypted form, whereas Telnet transmits both authentication credentials and data in clear text.
QUESTION NO: 140 Which of the following secure file transfer methods uses port 22 by default? A. FTPS B. SFTP C. SSL D. S/MIME
Answer: B Explanation: SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also use TCP port 22.
QUESTION NO: 111 An achievement in providing worldwide Internet security was the signing of certificates associated with which of the following protocols? A. TCP/IP B. SSL C. SCP D. SSH
Answer: B Explanation: SSL (Secure Sockets Layer) is used for establishing an encrypted link between two computers, typically a web server and a browser. SSL is used to enable sensitive information such as login credentials and credit card numbers to be transmitted securely.
QUESTION NO: 103 A security analyst needs to logon to the console to perform maintenance on a remote server. Which of the following protocols would provide secure access? A. SCP B. SSH C. SFTP D. HTTPS
Answer: B Explanation: Secure Shell (SSH) is a tunneling protocol originally used on Unix systems. It's now available for both Unix and Windows environments. SSH is primarily intended for interactive terminal sessions. SSH is used to establish a command-line, text-only interface connection with a server, router, switch, or similar device over any distance.
QUESTION NO: 124 Which of the following is the default port for TFTP? A. 20 B. 69 C. 21 D. 68
Answer: B Explanation: TFTP makes use of UDP port 69.
QUESTION NO: 125 A network consists of various remote sites that connect back to two main locations. Pete, the security administrator, needs to block TELNET access into the network. Which of the following, by default, would be the BEST choice to accomplish this goal? A. Block port 23 on the L2 switch at each remote site B. Block port 23 on the network firewall C. Block port 25 on the L2 switch at each remote site D. Block port 25 on the network firewall
Answer: B Explanation: Telnet is a terminal-emulation network application that supports remote connectivity for executing commands and running applications but doesn't support transfer of fi les. Telnet uses TCP port 23. Because it's a clear text protocol and service, it should be avoided and replaced with SSH.
QUESTION NO: 132 After a new firewall has been installed, devices cannot obtain a new IP address. Which of the following ports should Matt, the security administrator, open on the firewall? A. 25 B. 68 C. 80 D. 443
Answer: B Explanation: The Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on Internet Protocol (IP) networks for distributing IP addresses for interfaces and services. DHCP makes use of port 68.
QUESTION NO: 164 While previously recommended as a security measure, disabling SSID broadcast is not effective against most attackers because network SSIDs are: A. no longer used to authenticate to most wireless networks. B. contained in certain wireless packets in plaintext. C. contained in all wireless broadcast packets by default. D. no longer supported in 802.11 protocols.
Answer: B Explanation: The SSID is still required for directing packets to and from the base station, so it can be discovered using a wireless packet sniffer.
QUESTION NO: 130 A firewall technician has been instructed to disable all non-secure ports on a corporate firewall. The technician has blocked traffic on port 21, 69, 80, and 137-139. The technician has allowed traffic on ports 22 and 443. Which of the following correctly lists the protocols blocked and allowed? A. Blocked: TFTP, HTTP, NetBIOS; Allowed: HTTPS, FTP B. Blocked: FTP, TFTP, HTTP, NetBIOS; Allowed: SFTP, SSH, SCP, HTTPS C. Blocked: SFTP, TFTP, HTTP, NetBIOS; Allowed: SSH, SCP, HTTPS D. Blocked: FTP, HTTP, HTTPS; Allowed: SFTP, SSH, SCP, NetBIOS
Answer: B Explanation: The question states that traffic on port 21, 69, 80, and 137-139 is blocked, while ports 22 and 443 are allowed. Port 21 is used for FTP by default. Port 69 is used for TFTP. Port 80 is used for HTTP. Ports 137-139 are used for NetBIOS. VMM uses SFTP over default port 22. Port 22 is used for SSH by default. SCP runs over TCP port 22 by default. Port 443 is used for HTTPS.
QUESTION NO: 161 ON NO: 161 If you don't know the MAC address of a Linux-based machine, what command-line utility can you use to ascertain it? A. macconfig B. ifconfig C. ipconfig D. config
Answer: B Explanation: To find MAC address of a Unix/Linux workstation, use ifconfig or ip a.
QUESTION NO: 133 A security administrator has configured FTP in passive mode. Which of the following ports should the security administrator allow on the firewall by default? A. 20 B. 21 C. 22 D. 23
Answer: B Explanation: When establishing an FTP session, clients start a connection to an FTP server that listens on TCP port 21 by default.
QUESTION NO: 176 Which of the following would Pete, a security administrator, do to limit a wireless signal from penetrating the exterior walls? A. Implement TKIP encryption B. Consider antenna placement C. Disable the SSID broadcast D. Disable WPA
Answer: B Explanation: Cinderblock walls, metal cabinets, and other barriers can reduce signal strength significantly. Therefore, antenna placement is critical.
QUESTION NO: 107 Which of the following should be implemented to stop an attacker from mapping out addresses and/or devices on a network? A. Single sign on B. IPv6 C. Secure zone transfers D. VoIP
Answer: C Explanation: C: A primary DNS server has the "master copy" of a zone, and secondary DNS servers keep copies of the zone for redundancy. When changes are made to zone data on the primary DNS server, these changes must be distributed to the secondary DNS servers for the zone. This is done through zone transfers. If you allow zone transfers to any server, all the resource records in the zone are viewable by any host that can contact your DNS server. Thus you will need to secure the zone transfers to stop an attacker from mapping out your addresses and devices on your network.
QUESTION NO: 143 A technician has just installed a new firewall onto the network. Users are reporting that they cannot reach any website. Upon further investigation, the technician determines that websites can be reached by entering their IP addresses. Which of the following ports may have been closed to cause this issue? A. HTTP B. DHCP C. DNS D. NetBIOS
Answer: C Explanation: DNS links IP addresses and human-friendly fully qualified domain names (FQDNs), which are made up of the Top-level domain (TLD), the registered domain name, and the Subdomain or hostname. Therefore, if the DNS ports are blocked websites will not be reachable.
QUESTION NO: 116 A security administrator wishes to change their wireless network so that IPSec is built into the protocol and NAT is no longer required for address range extension. Which of the following protocols should be used in this scenario? A. WPA2 B. WPA C. IPv6 D. IPv4
Answer: C Explanation: IPSec security is built into IPv6.
QUESTION NO: 166 Which of the following best practices makes a wireless network more difficult to find? A. Implement MAC filtering B. UseWPA2-PSK C. Disable SSID broadcast D. Power down unused WAPs
Answer: C Explanation: Network administrators may choose to disable SSID broadcast to hide their network from unauthorized personnel. However, the SSID is still needed to direct packets to and from the base station, so it's a discoverable value using a wireless packet sniffer. Thus, the SSID should be disabled if the network isn't for public use.
QUESTION NO: 155 Which of the following would satisfy wireless network implementation requirements to use mutual authentication and usernames and passwords? A. EAP-MD5 B. WEP C. PEAP-MSCHAPv2 D. EAP-TLS
Answer: C Explanation: PEAP-MS-CHAP v2 is easier to deploy than EAP-TLS or PEAP-TLS because user authentication is accomplished via password-base credentials (user name and password) rather than digital certificates or smart cards.
QUESTION NO: 144 Which of the following ports would be blocked if Pete, a security administrator, wants to deny access to websites? A. 21 B. 25 C. 80 D. 3389
Answer: C Explanation: Port 80 is used by HTTP, which is the foundation of data communication for the World Wide Web.
QUESTION NO: 147 Which of the following protocols operates at the HIGHEST level of the OSI model? A. ICMP B. IPSec C. SCP D. TCP
Answer: C Explanation: SCP (Secure Copy) uses SSH (Secure Shell). SSH runs in the application layer (layer 7) of the OSI model.
QUESTION NO: 136 Pete needs to open ports on the firewall to allow for secure transmission of files. Which of the following ports should be opened on the firewall? A. TCP 23 B. UDP 69 C. TCP 22 D. TCP 21
Answer: C Explanation: SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also use TCP port 22. Secure Copy Protocol (SCP) is a secure file-transfer facility based on SSH and Remote Copy Protocol (RCP). Secure FTP (SFTP) is a secured alternative to standard File Transfer Protocol (FTP).
QUESTION NO: 177 Ann, a security administrator, has concerns regarding her company's wireless network. The network is open and available for visiting prospective clients in the conference room, but she notices that many more devices are connecting to the network than should be. Which of the following would BEST alleviate Ann's concerns with minimum disturbance of current functionality for clients? A. Enable MAC filtering on the wireless access point. B. Configure WPA2 encryption on the wireless access point. C. Lower the antenna's broadcasting power. D. Disable SSID broadcasting.
Answer: C Explanation: Some access points include power level controls that allow you to reduce the amount of output provided if the signal is traveling too far.
QUESTION NO: 127 A malicious program modified entries in the LMHOSTS file of an infected system. Which of the following protocols would have been affected by this? A. ICMP B. BGP C. NetBIOS D. DNS
Answer: C Explanation: The LMHOSTS file provides a NetBIOS name resolution method that can be used for small networks that do not use a WINS server. NetBIOS has been adapted to run on top of TCP/IP, and is still extensively used for name resolution and registration in Windows-based environments.
QUESTION NO: 119 Which of the following protocols allows for the LARGEST address space? A. IPX B. IPv4 C. IPv6 D. Appletalk
Answer: C Explanation: The main advantage of IPv6 over IPv4 is its larger address space. The length of an IPv6 address is 128 bits, compared with 32 bits in IPv4.
QUESTION NO: 110 An administrator configures all wireless access points to make use of a new network certificate authority. Which of the following is being used? A. WEP B. LEAP C. EAP-TLS D. TKIP
Answer: C Explanation: The majority of the EAP-TLS implementations require client-side X.509 certificates without giving the option to disable the requirement.
QUESTION NO: 149 A malicious user is sniffing a busy encrypted wireless network waiting for an authorized client to connect to it. Only after an authorized client has connected and the hacker was able to capture the client handshake with the AP can the hacker begin a brute force attack to discover the encryption key. Which of the following attacks is taking place? A. IV attack B. WEP cracking C. WPA cracking D. Rogue AP
Answer: C Explanation: There are three steps to penetrating a WPA-protected network. Sniffing Parsing Attacking
QUESTION NO: 109 Which of the following protocols is used to authenticate the client and server's digital certificate? A. PEAP B. DNS C. TLS D. ICMP
Answer: C Explanation: Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network. It uses X.509 certificates and hence asymmetric cryptography to authenticate the counterparty with whom it is communicating, and to exchange a symmetric key.
A company has implemented PPTP as a VPN solution. Which of the following ports would need to be opened on the firewall in order for this VPN to function properly? (Select TWO). A. UDP 1723 B. TCP 500 C. TCP 1723 D. UDP 47 E. TCP 47
Answer: C,D Explanation: A PPTP tunnel is instantiated by communication to the peer on TCP port 1723. This TCP connection is then used to initiate and manage a second GRE tunnel to the same peer. The PPTP GRE packet format is non-standard, including an additional acknowledgement field replacing the typical routing field in the GRE header. However, as in a normal GRE connection, those modified GRE packets are directly encapsulated into IP packets, and seen as IP protocol number 47.
QUESTION NO: 114 Which of the following protocols allows for secure transfer of files? (Select TWO). A. ICMP B. SNMP C. SFTP D. SCP E. TFTP
Answer: C,D Explanation: Standard FTP is a protocol often used to move files between one system and another either over the Internet or within private networks. SFTP is a secured alternative to standard FTP. Secure Copy Protocol (SCP) is a secure file-transfer facility based on SSH and Remote Copy Protocol (RCP).
QUESTION NO: 167 Jane, the security administrator, sets up a new AP but realizes too many outsiders are able to connect to that AP and gain unauthorized access. Which of the following would be the BEST way to mitigate this issue and still provide coverage where needed? (Select TWO). A. Disable the wired ports B. Use channels 1, 4 and 7 only C. Enable MAC filtering D. Disable SSID broadcast E. Switch from 802.11a to 802.11b
Answer: C,D Explanation: Network administrators may choose to disable SSID broadcast to hide their network from unauthorized personnel. However, the SSID is still needed to direct packets to and from the base station, so it's a discoverable value using a wireless packet sniffer. Thus, the SSID should be disabled if the network isn't for public use. A MAC filter is a list of authorized wireless client interface MAC addresses that is used by a WAP to block access to all unauthorized devices.
QUESTION NO: 142 A security technician needs to open ports on a firewall to allow for domain name resolution. Which of the following ports should be opened? (Select TWO). A. TCP 21 B. TCP 23 C. TCP 53 D. UDP 23 E. UDP 53
Answer: C,E Explanation: DNS uses TCP and UDP port 53. TCP port 53 is used for zone transfers, whereas UDP port 53 is used for queries.
QUESTION NO: 160 A security analyst has been tasked with securing a guest wireless network. They recommend the company use an authentication server but are told the funds are not available to set this up. Which of the following BEST allows the analyst to restrict user access to approved devices? A. Antenna placement B. Power level adjustment C. Disable SSID broadcasting D. MAC filtering
Answer: D Explanation: A MAC filter is a list of authorized wireless client interface MAC addresses that is used by a WAP to block access to all unauthorized devices.
QUESTION NO: 173 A system administrator wants to enable WPA2 CCMP. Which of the following is the only encryption used? A. RC4 B. DES C. 3DES D. AES
Answer: D Explanation: Cipher Block Chaining Message Authentication Code Protocol (CCMP) makes use of 128-bit AES encryption with a 48-bit initialization vector.
QUESTION NO: 151 A security administrator must implement a wireless security system, which will require users to enter a 30 character ASCII password on their accounts. Additionally the system must support 3DS wireless encryption. Which of the following should be implemented? A. WPA2-CCMP with 802.1X B. WPA2-PSK C. WPA2-CCMP D. WPA2-Enterprise
Answer: D Explanation: D: WPA-Enterprise is also referred to as WPA-802.1X mode, and sometimes just WPA (as opposed to WPA-PSK), this is designed for enterprise networks and requires a RADIUS authentication server. This requires a more complicated setup, but provides additional security (e.g. protection against dictionary attacks on short passwords). Various kinds of the Extensible Authentication Protocol (EAP) are used for authentication. RADIUS can be managed centrally, and the servers that allow access to a network can verify with a RADIUS server whether an incoming caller is authorized. Thus the RADIUS server can perform all authentications. This will require users to use their passwords on their user accounts.
QUESTION NO: 153 A security administrator must implement a network authentication solution which will ensure encryption of user credentials when users enter their username and password to authenticate to the network. Which of the following should the administrator implement? A. WPA2 over EAP-TTLS B. WPA-PSK C. WPA2 with WPS D. WEP over EAP-PEAP
Answer: D Explanation: D: Wired Equivalent Privacy (WEP) is designed to provide security equivalent to that of a wired network. WEP has vulnerabilities and isn't considered highly secure. Extensible Authentication Protocol (EAP) provides a framework for authentication that is often used with wireless networks. Among the five EAP types adopted by the WPA/ WPA2 standard are EAP-TLS, EAP-PSK, EAP MD5, as well as LEAP and PEAP. PEAP is similar in design to EAP-TTLS, requiring only a server-side PKI certificate to create a secure TLS tunnel to protect user authentication, and uses server-side public key certificates to authenticate the server. It then creates an encrypted TLS tunnel between the client and the authentication server. In most configurations, the keys for this encryption are transported using the server's public key. The ensuing exchange of authentication information inside the tunnel to authenticate the client is then encrypted and user credentials are safe from eavesdropping.
QUESTION NO: 123 Which of the following is a difference between TFTP and FTP? A. TFTP is slower than FTP. B. TFTP is more secure than FTP. C. TFTP utilizes TCP and FTP uses UDP. D. TFTP utilizes UDP and FTP uses TCP.
Answer: D Explanation: FTP employs TCP ports 20 and 21 to establish and maintain client-to-server communications, whereas TFTP makes use of UDP port 69.
QUESTION NO: 117 A system administrator attempts to ping a hostname and the response is 2001:4860:0:2001::68. Which of the following replies has the administrator received? A. The loopback address B. The local MAC address C. IPv4 address D. IPv6 address
Answer: D Explanation: IPv6 addresses are 128-bits in length. An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits (two octets). The groups are separated by colons (:). The hexadecimal digits are case-insensitive, but IETF recommendations suggest the use of lower case letters. The full representation of eight 4-digit groups may be simplified by several techniques, eliminating parts of the representation.
An information bank has been established to store contacts, phone numbers and other records. A UNIX application needs to connect to the index server using port 389. Which of the following authentication services should be used on this port by default? A. RADIUS B. Kerberos C. TACACS+ D. LDAP
Answer: D Explanation: LDAP makes use of port 389.
QUESTION NO: 156 Matt, a systems security engineer, is determining which credential-type authentication to use within a planned 802.1x deployment. He is looking for a method that does not require a client certificate, has a server side certificate, and uses TLS tunnels for encryption. Which credential type authentication method BEST fits these requirements? A. EAP-TLS B. EAP-FAST C. PEAP-CHAP D. PEAP-MSCHAPv2
Answer: D Explanation: PEAP-MS-CHAP v2 is easier to deploy than EAP-TLS or PEAP-TLS because user authentication is accomplished via password-base credentials (user name and password) rather than digital certificates or smart cards. Only servers running Network Policy Server (NPS) or PEAP-MS-CHAP v2 are required to have a certificate.
QUESTION NO: 146 Ann, a technician, is attempting to establish a remote terminal session to an end user's computer using Kerberos authentication, but she cannot connect to the destination machine. Which of the following default ports should Ann ensure is open? A. 22 B. 139 C. 443 D. 3389
Answer: D Explanation: Remote Desktop Protocol (RDP) uses TCP port 3389.
QUESTION NO: 102 Which of the following is BEST used as a secure replacement for TELNET? A. HTTPS B. HMAC C. GPG D. SSH
Answer: D Explanation: SSH transmits both authentication traffic and data in a secured encrypted form, whereas Telnet transmits both authentication credentials and data in clear text.
QUESTION NO: 121 Which of the following ports and protocol types must be opened on a host with a host-based firewall to allow incoming SFTP connections? A. 21/UDP B. 21/TCP C. 22/UDP D. 22/TCP
Answer: D Explanation: SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also use TCP port 22.
QUESTION NO: 134 TION NO: 134 Which of the following ports is used for SSH, by default? A. 23 B. 32 C. 12 D. 22
Answer: D Explanation: Secure Shell (SSH) is a cryptographic network protocol for securing data communication. It establishes a secure channel over an insecure network in a client-server architecture, connecting an SSH client application with an SSH server. Common applications include remote command-line login, remote command execution, but any network service can be secured with SSH. SSH uses port 22.
QUESTION NO: 180 A company has recently implemented a high density wireless system by having a junior technician install two new access points for every access point already deployed. Users are now reporting random wireless disconnections and slow network connectivity. Which of the following is the MOST likely cause? A. The old APs use 802.11a B. Users did not enter the MAC of the new APs C. The new APs use MIMO D. A site survey was not conducted
Answer: D Explanation: To test the wireless AP placement, a site survey should be performed.
QUESTION NO: 154 Which of the following BEST describes the weakness in WEP encryption? A. The initialization vector of WEP uses a crack-able RC4 encryption algorithm. Once enough packets are captured an XOR operation can be performed and the asymmetric keys can be derived. B. The WEP key is stored in plain text and split in portions across 224 packets of random data. Once enough packets are sniffed the IV portion of the packets can be removed leaving the plain text key. C. The WEP key has a weak MD4 hashing algorithm used. A simple rainbow table can be used to generate key possibilities due to MD4 collisions. D. The WEP key is stored with a very small pool of random numbers to make the cipher text. As the random numbers are often reused it becomes easy to derive the remaining WEP key.
Answer: D Explanation: WEP is based on RC4, but due to errors in design and implementation, WEP is weak in a number of areas, two of which are the use of a static common key and poor implementation of initiation vectors (IVs). When the WEP key is discovered, the attacker can join the network and then listen in on all other wireless client communications.
QUESTION NO: 150 Which of the following is a step in deploying a WPA2-Enterprise wireless network? A. Install a token on the authentication server B. Install a DHCP server on the authentication server C. Install an encryption key on the authentication server D. Install a digital certificate on the authentication server
Answer: D Explanation: When setting up a wireless network, you'll find two very different modes of Wi-Fi Protected Access (WPA) security, which apply to both the WPA and WPA2 versions. The easiest to setup is the Personal mode, technically called the Pre-Shared Key (PSK) mode. It doesn't require anything beyond the wireless router or access points (APs) and uses a single passphrase or password for all users/devices. The other is the Enterprise mode —which should be used by businesses and organizations—and is also known as the RADIUS, 802.1X, 802.11i, or EAP mode. It provides better security and key management, and supports other enterprise-type functionality, such as VLANs and NAP. However, it requires an external authentication server, called a Remote Authentication Dial In User Service (RADIUS) server to handle the 802.1X authentication of users. To help you better understand the process of setting up WPA/WPA2-Enterprise and 802.1X, here's the basic overall steps: Choose, install, and configure a RADIUS server, or use a hosted service. Create a certificate authority (CA), so you can issue and install a digital certificate onto the RADIUS server, which may be done as a part of the RADIUS server installation and configuration. Alternatively, you could purchase a digital certificate from a public CA, such as GoDaddy or Verisign, so you don't have to install the server certificate on all the clients. If using EAP-TLS, you'd also create digital certificates for each end-user. On the server, populate the RADIUS client database with the IP address and shared secret for each AP. On the server, populate user data with usernames and passwords for each end-user. On each AP, configure the security for WPA/WPA2-Enterprise and input the RADIUS server IP address and the shared secret you created for that particular AP. On each Wi-Fi computer and device, configure the security for WPA/WPA2-Enterprise and set the 802.1X authentication settings.
QUESTION NO: 113 FTP/S uses which of the following TCP ports by default? A. 20 and 21 B. 139 and 445 C. 443 and 22 D. 989 and 990
Answer: D Explanation: FTPS uses ports 989 and 990.
QUESTION NO: 106 When reviewing security logs, an administrator sees requests for the AAAA record of www.comptia.com. Which of the following BEST describes this type of record? A. DNSSEC record B. IPv4 DNS record C. IPSEC DNS record D. IPv6 DNS record
Answer: D Explanation: The AAAA Address record links a FQDN to an IPv6 address.
QUESTION NO: 108 A security engineer, Joe, has been asked to create a secure connection between his mail server and the mail server of a business partner. Which of the following protocol would be MOST appropriate? A. HTTPS B. SSH C. FTP D. TLS
Answer: D Explanation: Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network. It uses X.509 certificates and hence asymmetric cryptography to authenticate the counterparty with whom it is communicating, and to exchange a symmetric key. The TLS protocol allows client-server applications to communicate across a network in a way designed to prevent eavesdropping and tampering.
QUESTION NO: 104 A UNIX administrator would like to use native commands to provide a secure way of connecting to other devices remotely and to securely transfer files. Which of the following protocols could be utilized? (Select TWO). A. RDP B. SNMP C. FTP D. SCP E. SSH
Answer: D,E Explanation: SSH is used to establish a command-line, text-only interface connection with a server, router, switch, or similar device over any distance. Secure Copy Protocol (SCP) is a secure file-transfer facility based on SSH and Remote Copy Protocol (RCP). SCP is commonly used on Linux and Unix platforms.
QUESTION NO: 135 By default, which of the following uses TCP port 22? (Select THREE). A. FTPS B. STELNET C. TLS D. SCP E. SSL F. HTTPS G. SSH H. SFTP
Answer: D,G,H Explanation: G: Secure Shell (SSH) is a cryptographic network protocol for securing data communication. It establishes a secure channel over an insecure network in a client-server architecture, connecting an SSH client application with an SSH server. Common applications include remote command-line login, remote command execution, but any network service can be secured with SSH. SSH uses port 22. D: SCP stands for Secure Copy. SCP is used to securely copy files over a network. SCP uses SSH to secure the connection and therefore uses port 22. H: SFTP stands for stands for Secure File Transfer Protocol and is used for transferring files using FTP over a secure network connection. SFTP uses SSH to secure the connection and therefore uses port 22.
QUESTION NO: 128 DRAG DROP
Protocol/port simulation
