Networking - Chapter 6: Firewall and Intrusion Detection

Which options are you able to set on a firewall? (Select three.) A. Sequence number B. Digital signature C. Acknowledgement number D. Packet source address E. Port number F. Checksum G. Packet destination address

C. Acknowledgement number D. Packet source address G. Packet destination address

Which of the following does the sudo iptables -F command accomplish? A. Clears all the current rules. B. Drops all incoming traffic. C. Lists all the current rules. D. Saves changes to iptables.

A. Clears all the current rules.

Which of the following are specific to extended Access control lists? (Select two.) A. Use the number ranges 100-199 and 2000-2699. B. Are the most used type of ACL. C. Are used by route maps and VPN filters. D. Should be placed as close to the destination as possible. E. Identify traffic based on the destination address.

A. Use the number ranges 100-199 and 2000-2699. B. Are the most used type of ACL.

How many network interfaces does a dual-homed gateway typically have? A. four B. two C. three D. one

C. three

Which of the following is true about a network-based firewall? A. A network-based firewall is installed at the edge of a private network or network segment. B. A network-based firewall is installed on a single computer. C. A network-based firewall is less expensive and easier to use than host-based firewalls. D. A network-based firewall are considered software firewalls.

A. A network-based firewall is installed at the edge of a private network or network segment.

You have been given a laptop to use for work. You connect the laptop to your company network, use the laptop from home, and use it while traveling. You want to protect the laptop from internet-based attacks. Which solution should you use? A. Host-based firewall B. VPN concentrator C. Proxy server D. Network-based firewall

A. Host-based firewall

Which of the following combines several layers of security services and network functions into one piece of hardware? A. Unified Threat Management (UTM) B. Circuit-level gateway C. Firewall D. Intrusion detection system (IDS)

A. Unified Threat Management (UTM)

Which of the following terms describes a network device that is exposed to attacks and has been hardened against those attacks? A. Kernel proxy B. Bastion C. Multi-homed D. Circuit proxy

B. Bastion

Which IDS type can alert you to trespassers? A. NIDS B. PIDS C. VMIDS D. HIDS

B. PIDS

Which IDS method searches for intrusion or attack attempts by recognizing patterns or identifying entities listed in a database? A. Anomaly analysis-based IDS B. Signature-based IDS C. Heuristics-based IDS D. Stateful inspection-based IDS

B. Signature-based IDS

Which IDS method defines a baseline of normal network traffic and then looks for anything that falls outside of that baseline? A. Pattern matching B. Misuse detection C. Anomaly-based D. Dictionary recognition

C. Anomaly-based

Which of the following chains is used for incoming connections that aren't delivered locally? A. Drop B. Output C. Forward D. Reject

C. Forward

Which of the following is true about a firewall? A. Host-based firewalls and network-based firewalls can be installed separately, but they cannot be placed together to provide multiple layers of protection. B. Implicit deny is used to deny permissions to a specific user even when the rest of the user's group is allowed access. C. You must manually specify which traffic you want to allow through the firewall. Everything else is blocked. D. Firewalls protect against email spoofing attacks.

C. You must manually specify which traffic you want to allow through the firewall. Everything else is blocked.

Which of the following is a firewall function? A. Frame filtering B. FTP hosting C. Encrypting D. Packet filtering

D. Packet filtering

As a security precaution, you've implemented IPsec to work between any two devices on your network. IPsec provides encryption for traffic between devices. You would like to implement a solution that can scan the contents of the encrypted traffic to prevent any malicious attacks. Which solution should you implement? A. Protocol analyzer B. Network-based IDS C. VPN concentrator D. Port scanner E. Host-based IDS

E. Host-based IDS

Which of the following BEST describes a stateful inspection? A. Determines the legitimacy of traffic based on the state of the connection from which the traffic originated. B. Allows all internal traffic to share a single public IP address when connecting to an outside entity. C. Offers secure connectivity between many entities and uses encryption to provide an effective defense against sniffing. D. Designed to sit between a host and a web server and communicate with the server on behalf of the host.

A. Determines the legitimacy of traffic based on the state of the connection from which the traffic originated.

Which of the following are true about reverse proxy? (Select two.) A. Handles requests from the internet to a server on a private network. B. Clients always know they are using reverse proxy. C. Handles requests from inside a private network out to the internet. D. Can perform load balancing, authentication, and caching. E. Sits between a client computer and the internet.

A. Handles requests from the internet to a server on a private network. D. Can perform load balancing, authentication, and caching.

You're concerned about attacks directed at your network firewall. You want to be able to identify and be notified of any attacks. In addition, you want the system to take immediate action to stop or prevent the attack, if possible. Which tool should you use? A. IPS B. Packet sniffer C. IDS D. Port scanner

A. IPS

You have used firewalls to create a screened subnet. You have a web server that needs to be accessible to internet users. The web server must communicate with a database server to retrieve product, customer, and order information. How should you place devices on the network to best protect the servers? (Select two.) A. Put the database server on the private network. B. Put the database server outside the screened subnet. C. Put the database server inside the screened subnet. D. Put the web server inside the screened subnet. E. Put the web server on the private network.

A. Put the database server on the private network. D. Put the web server inside the screened subnet.

You are managing a network and have used firewalls to create a screened subnet. You have a web server that internet users need to access. It must communicate with a database server to retrieve product, customer, and order information. How should you place devices on the network to best protect the servers? (Select two.) A. Put the web server inside the screened subnet. B. Put the database server inside the screened subnet. C. Put the web server on the private network. D. Put the database server and the web server inside the screened subnet. E. Put the database server on the private network.

A. Put the web server inside the screened subnet. E. Put the database server on the private network.

Which of the following uses access control lists (ACLs) to filter packets as a form of security? A. Screened router B. Dual-homed gateway C. Screened-host gateway D. Screened subnet

A. Screened router

Which of the following are characteristics of a packet-filtering firewall? (Select two.) A. Stateless B. Stateful C. Filters based on URL D. Filters based on sessions E. Filters IP address and port

A. Stateless E. Filters IP address and port

Which of the following are true about routed firewalls? (Select two.) A. Supports multiple interfaces. B. Internal and external interfaces connect to the same network segment. C. Easily introduced to an existing network. D. Counts as a router hop. E. Operates at Layer 2.

A. Supports multiple interfaces. D. Counts as a router hop.

Which device combines multiple security features, such as anti-spam, load-balancing, and antivirus, into a single network appliance? A. Unified Threat Management (UTM) B. Next Generation Firewall (NGFW) C. Circuit-level gateway D. Packet-filtering firewall

A. Unified Threat Management (UTM)

You have a company network that is connected to the internet. You want all users to have internet access, but you need to protect your private network and users. You also need to make a web server publicly available to the internet users. Which solution should you use? A. Use firewalls to create a screened subnet. Place the web server inside the screened subnet and the private network behind the screened subnet. B. Use a single firewall. Put the web server in front of the firewall and the private network behind the firewall. C. Use firewalls to create a screened subnet. Place the web server and the private network inside the screened subnet. D. Use a single firewall. Put the server and the private network behind the firewall.

A. Use firewalls to create a screened subnet. Place the web server inside the screened subnet and the private network behind the screened subnet.

Your company has an internet connection. You also have a web server and an email server that you want to make available to your internet users, and you want to create a screened subnet for these two servers. Which of the following should you use? A. A host-based firewall B. A network-based firewall C. An IPS D. An IDS

B. A network-based firewall

How does a proxy server differ from a packet-filtering firewall? A. A proxy server includes filters for the session ID as well as the IP address and port number. B. A proxy server operates at the Application layer, while a packet-filtering firewall operates at the Network layer. C. A proxy server can prevent unknown network attacks, while a packet-filtering firewall can only prevent known attacks. D. A proxy server is used to create a screened subnet, while a packet-filtering firewall can only be used with screened subnets.

B. A proxy server operates at the Application layer, while a packet-filtering firewall operates at the Network layer.

Which of the following describes how access control lists can improve network security? A. An access control list filters traffic based on the frame header, such as source or destination MAC address. B. An access control list filters traffic based on the IP header information, such as source or destination IP address, protocol, or socket number. C. An access control list looks for patterns of traffic between multiple packets and takes action to stop detected attacks. D. An access control list identifies traffic that must use authentication or encryption.

B. An access control list filters traffic based on the IP header information, such as source or destination IP address, protocol, or socket number.

Based on the diagram, which type of proxy server is handling the client's request? A. Circuit-level proxy server B. Reverse proxy server C. Forward proxy server D. Open proxy server

B. Reverse proxy server

Which of the following can serve as a buffer zone between a private, secured network and an untrusted network? A. Padded cell B. Screened subnet C. Extranet D. Intranet

B. Screened subnet

Which of the following describes the worst possible action by an IDS? A. The system identified harmless traffic as offensive and generated an alarm. B. The system identified harmful traffic as harmless and allowed it to pass without generating any alerts. C. The system correctly deemed harmless traffic as inoffensive and let it pass. D. The system detected a valid attack and the appropriate alarms and notifications were generated.

B. The system identified harmful traffic as harmless and allowed it to pass without generating any alerts.

Your Cisco router has three network interfaces configured. S0/1/0 is a WAN interface that is connected to an ISP. F0/0 is connected to an Ethernet LAN segment with a network address of 192.168.1.0/24. F0/1 is connected to an Ethernet LAN segment with a network address of 192.168.2.0/24. You have configured an access control list on this router using the following rules: deny ip 192.168.1.0 0.0.0.255 any deny ip 192.168.2.0 0.0.0.255 any These rules will be applied to the WAN interface on the router. Your goal is to block any IP traffic coming in on the WAN interface that has a spoofed source address that makes it appear to be coming from the two internal networks. However, when you enable the ACL, you find that no traffic is being allowed through the WAN interface. What should you do? A. Apply the access list to the Fa0/1 interface instead of the S0/1/0 interface. B. Use the out parameter instead of the in parameter within each ACL rule. C. Add a permit statement to the bottom of the access list. D. Apply the access list to the Fa0/0 interface instead of the S0/1/0 interface.

C. Add a permit statement to the bottom of the access list.

What do you need to configure on a firewall to allow traffic directed to the public resources on the screened subnet? A. Subnet B. FTP C. Packet filters D. VPN

C. Packet filters

Which of the following is another name for a firewall that performs router functions? A. Screened subnet B. Dual-homed gateway C. Screening router D. Screened-host gateway

C. Screening router

You've just installed a new network-based IDS system that uses signature recognition. What should you do on a regular basis? A. Modify clipping levels. B. Generate a new baseline. C. Update the signature files. D. Check for backdoors.

C. Update the signature files.

Which of the following is the BEST solution to allow access to private resources from the internet? A. Subnet B. FTP C. VPN D. Packet filters

C. VPN

In which of the following situations would you MOST likely implement a screened subnet? A. You want users to see a single IP address when they access your company network. B. You want to encrypt data sent between two hosts using the internet. C. You want to protect a public web server from attack. D. You want to detect and respond to attacks in real time.

C. You want to protect a public web server from attack.

Which of the following is true about an intrusion detection system? A. An intrusion detection system can terminate or restart other processes on the system. B. An intrusion detection system maintains an active security role within the network. C. An intrusion detection system can block malicious activities. D. An intrusion detection system monitors data packets for malicious or unauthorized traffic.

D. An intrusion detection system monitors data packets for malicious or unauthorized traffic.

Which IDS traffic assessment indicates that the system identified harmless traffic as offensive and generated an alarm or stopped the traffic? A. False negative B. Negative C. Positive D. False positive

D. False positive

Which of the following is true about an NIDS? A. It can monitor changes that you've made to applications and systems. B. It can access encrypted data packets. C. It can analyze fragmented packets. D. It detects malicious or unusual incoming and outgoing traffic in real time.

D. It detects malicious or unusual incoming and outgoing traffic in real time.