CPMT-1305 Chapter 6

A technician needs to add a new wireless device to a small WLAN. The WLAN is a mixture of old and newer 802.11b and 802.11g devices. What choice for the new device would provide the most interoperability for present and future growth?

Add a new 802.11n device. 802.11n devices are interoperable with all the other standards, and provide more bandwidth than the other standards. 802.11a is not interoperable with any of the other standards. 802.11b and 802.11g interoperate with each other, but do not provide the bandwidth supplied by 802.11n devices.

What security technique could provide secure access to a server located in a small office without the expense of implementing a DMZ or purchasing a hardware firewall?

Implement port forwarding

A customer has a web server for a small business. The business uses both wired and wireless networking. A Linksys WRT300N wireless router provides wireless and wired connectivity. What firewall option may be enabled in order for customers to gain access to the web server from their remote locations?

Port forwarding directs traffic between networks using forwarding rules. WPA encrypts wireless information, and MAC filtering prevents unauthorized access to the WLAN. Port triggering is a technique used with NAT configurations. The correct answer is: port forwarding

A small company is upgrading its phone system with IP phones. These phones can be used just by plugging into a network port in the offices. Which technology would support the IP phones?

Power over Ethernet Power over Ethernet (PoE) is implemented through switches. A PoE switch transfers small amounts of DC current over an Ethernet cable, along with the data, to power PoE devices. Low voltage devices that support PoE, such as IP phones, can be powered through the Ethernet cable.

What is the proper CIDR prefix notation for a subnet mask of 255.0.0.0?

/8

A device has been assigned the IPv6 address of 2001:0db8:cafe:4500:1000:00d8:0058:00ab/64. Which is the host identifier of the device?

1000:00d8:0058:00ab

Which is the compressed format of the IPv6 address 2001:0db8:0000:0000:0000:a0b0:0008:0001?

2001:db8::a0b0:8:1

Which IPv6 address represents the most compressed form of the IPv6 address 2001:0db8:cafe:0000:0835:0000:0000:0aa0/80?

2001:db8:cafe:0:835::aa0/80

What is the correct compressed format of the IPv6 address 2001:0db8:eeff:000a:0000:0000:0000:0001?

2001:db8:eeff:a::1

How many bits are used to represent the OUI part of the MAC address of a NIC card?

24

A computer is assigned an IP address of 169.254.33.16. What can be said about the computer, based on the assigned address?

If a computer is configured with DHCP but it cannot communicate with the DHCP server in order to obtain an IP address, the Windows OS automatically assigns a link-local IP, in the range of 169.254.0.0 to 169.254.255.255. The computer can only communicate with other computers connected to the same 169.254.0.0/16 network and cannot communicate with computers in another network. The correct answer is: It cannot communicate outside its own network.

The current IP configuration of a small company is done manually and is time-consuming. Because of increased network growth, a technician needs a simpler way for IP configuration of workstations. Which service would simplify the workstation IP configuration task?

DHCP

Which network protocol is used to automatically assign an IP address to a computer on a network?

DHCP

Which protocol dynamically assigns IP addresses to network devices?

DHCP

A wired network is undergoing several changes that could leave it vulnerable to connection by unauthorized devices while the work is in progress. Which two temporary measures would enable the authorized devices to continue to have network access but prevent unauthorized devices from connecting? (Choose two.)

Disable DHCP Assign static IP addresses to the authorized devices.

After having talked to the customer, a network technician suspects that an invalid IP address is the most likely cause of a network issue. Which step of the troubleshooting process does this represent?

Establish a theory of probable cause

A computer has been assigned an IP address of 169.254.33.16. What command initiates the process of requesting a new IP address?

Forcing a PC to release its DHCP binding allows a new DHCP request operation to occur. The net, tracert, and nslookup commands do not have any effect on DHCP configurations. The correct answer is: ipconfig /release

Multiple users report that the workstations are assigned a 169.254.x.x IP address. The users are able to communicate only between each other. What is a possible solution?

Restart the DHCP server.

A group of users is unable to connect to the network. When testing several of the PCs and issuing the command ipconfig , the technician notices that all of them have an IP address in the 169.254.x.x range. What is the most likely cause of this problem?

The DHCP server is not operational.

Which protocol is used by ping to test connectivity between network hosts?

The Internet Control Message Protocol (ICMP) is used by ping to test connectivity between network hosts. The Address Resolution Protocol (ARP) is used to map IP addresses to MAC addresses. The Dynamic Host Configuration Protocol (DHCP) is used to dynamically assign IP addresses to network hosts. The Transmission Control Protocol (TCP) is considered a reliable protocol that segments the application layer data into segments for transmission. The correct answer is: ICMP

A user can print to a printer that is on the same network, but the traffic of the user cannot reach the Internet. What is a possible cause of the problem?

The PC default gateway address is missing or incorrect.

What two default wireless router settings can affect network security? (Choose two.)

The SSID is broadcast, A well-known administrator password is set

A device has been assigned the IPv6 address of 2001:0db8:cafe:4500:1000:00d8:0058:00ab/64. Which is the network identifier of the device?

The address has a prefix length of /64. The first 64 bits represent the network portion, whereas the last 64 bits represent the host portion of the IPv6 address. In this example the network bits are 2001:0db8:cafe:4500. The correct answer is: 2001:0db8:cafe:4500

A technician is troubleshooting a problem where the user claims access to the Internet is not working, but there was access to the Internet the day before. Upon investigation, the technician determines that the user cannot access the network printer in the office either. The network printer is on the same network as the computer. The computer has 169.254.100.88 assigned as an IP address. What is the most likely problem?

The computer cannot communicate with a DHCP server

A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?

The computer has an invalid default gateway address The default gateway is the address of the device a host uses to access the Internet or another network. If the default gateway is missing or incorrect, that host will not be able to communicate outside the local network. Because the host can access other hosts on the local network, the network cable and the other parts of the IP configuration are working.

A new computer workstation has been installed in a small office. The user of the workstation can print a document using a network printer on the LAN, but cannot access the Internet. What is a possible cause of the problem?

The fact that the workstation can print at a networked printer indicates that the TCP/IP stack is functional. However, that the workstation cannot communicate with external networks indicates that the most likely problem is the incorrect default gateway address. If the workstation is configured to obtain an IP address automatically, the DHCP server address does not to be configured. The correct answer is: The gateway IP address is misconfigured.

A PC is not able to connect to a wired network. Pinging the loopback address is successful, but the gateway cannot be reached. On the network switch all the interface lights are on, except for the interface connected to the PC. The LED on the network card is off. What is the most likely cause of this problem?

The network cable is faulty

A user reports that the corporate web server cannot be accessed. A technician verifies that the web server can be accessed by its IP address. What are two possible causes of the problem? (Choose two.)

The web server information is misconfigured on the DNS server.

A workstation has been moved from the first floor to the fifth floor within an organization. The user is now reporting that the workstation cannot connect to the network. A technician suspects that the workstation could not obtain an IP address from a DHCP server. What is a possible cause of the problem?

The workstation has been configured with a static IP address

A network technician is setting up a web server for a small company. The company has obtained a domain name companyX.com from a domain registry service. The web server must provide secure communication through SSL/TLS technology. When the technician enters companyX.com in the web browser, the unsecured part of the website is displayed. What should the technician do to make the web browser display the secure content of the web server?

Use https://companyX.com as the URL. A web URL is in the form protocol://domain-name/resource. HTTP is the default protocol used by all web browsers so that if a user does not specify the protocol in the URL, HTTP is used by default. In order to access the secure content serviced through SSL/TLS, a user must specify HTTPS as the protocol in the URL.

What is the problem if a computer automatically configures an IP address in the 169.254.x.x address range?

When a computer automatically configures an IP address in the 169.254.x.x range, then it is an indication that the DHCP is inaccessible or down. The correct answer is: The DHCP server is unreachable.

What is a result when the DHCP servers are not operational in a network?

When workstations are configured with obtaining IP address automatically but DHCP servers are not available to respond to the requests, a workstation can assign itself an IP addresses from the 169.254.0.0/16 network. The correct answer is: Workstations are assigned with IP addresses in the 169.254.0.0/16 network.

Which filtering method uses IP addresses to specify allowed devices on your network?

Whitelisting and blacklisting specify which IP addresses are allowed or denied on your network. This is typically done using an access list or access policy. The correct answer is: whitelisting

A wireless router is displaying the IP address of 192.168.0.1. What could this mean?

Wireless routers usually come with factory default settings. The IP address is often set to 192.168.0.1. The default username and password are often admin. The IP address, username, and password should all be modified to help secure the router. The correct answer is: The wireless router still has the factory default IP address.

A network technician is checking a computer to see if the DHCP client is working correctly. The technician issues the ipconfig /all command. Which two parameters should the technician review? (Choose two.)

default gateway subnet mask

A technician troubleshooting a network problem has used CLI commands to determine that a computer has not been allocated a correct IP address from the DHCP server. Which command can the technician use to solve this problem?

ipconfig/renew

What command can be used to troubleshoot domain name resolution issues?

nslookup

A company is setting up one new laser printer on every floor. What type of server will store the print jobs in a queue and then spool them to the device when it is ready?

print server

What physical layer medium is used by DSL to provide high-speed data communications?

telephone lines DSL uses existing telephone lines to carry voice and data traffic at the same time. DSL uses a filter to separate the traffic.

Which network server is malfunctioning if a user can ping the IP address of a web server but cannot ping the web server host name?

the DNS server

A technician wishes to update the NIC driver for a computer. What is the best location for finding new drivers for the NIC?

the website for the manufacturer of the NIC

Users in a recently installed wireless network are complaining of slow data transfer and frequent loss of connectivity. The technician checks that the wireless security is correctly implemented, and there is no evidence of unauthorized users on the network. Which two problems might the technician suspect? (Choose two.)

the wireless signal is too weak, there is interference from outside sources

A technician is configuring the channel on a wireless router to either 1, 6, or 11. What is the purpose of adjusting the channel?

to avoid interference from nearby wireless devices

A user is setting up a home wireless network. Which type of device must the user have in order to establish the wireless network and provide access to the internet for multiple home devices?

wireless router A wireless router connects multiple wireless devices to the network. It will then aggregate the internet access requests from home devices to the internet.