CIS275 CH8

While troubleshooting an IPv4 network connection problem, you start to wonder if the local computer's NIC is working correctly. What command should you enter at the command prompt to test your theory?

Ping 127.0.0.1 Loopback address that can be used to test to see if the NIC of a local computer is working properly or not

Different network devices function at different network communication layers, depending on their purpose. Using the TCP/IP model, identify the highest layer accessed by each of the following devices: a. Router b. Unmanaged switch c. Wireless access point d. Firewall

Router, internet layer Unmanged switch, link layer Wireless access point, link layer Firewall, application layer

You've been hired to help with installing cable at a new office building for the local branch of the Social Security Administration. You're wiring a connection into the first room on your list. List the colors of the wires in the order you should place them into the connector, starting with pin 1.

Standard T568A. green/white, green, orange/white, blue, blue/white, orange, brown/white, brown

You're setting up a secure email server on your local network that you want clients to be able to access from the Internet using IMAP4 and SMTP. Which ports should you open in your firewall? a. 25 and 143 b. 587 and 993 c. 80 and 443 d. 25 and 110

b. 587 and 993 Port 993 is used by IMAP secure protocol and used if the user wants to connect the IMAP securely. SMTP can be used with port 587 which is also termed as a message submission port.

A hub transmits all incoming messages to all of its ports except the port where the messages came in. A switch usually sends messages only to the destination computer. What information does a switch collect from messages crossing its interfaces so it knows where to send data in future transmissions? a. IP address b. MAC address c. Port number d. FQDN

b. MAC address

Lately your IPv6 network has experienced problems connecting new clients to the network. As part of your troubleshooting, you run an ipconfig command on one of the client computers and find two IPv6 addresses reported on the Ethernet interface: fe80::894d:c173:fef2 and fdb9::75f8:e30c:7cf4. Which one indicates the DHCPv6 server is probably working correctly? How do you know?

fdb9::75f8:e30c:7cf4 fe80: represents the local link address he computer assigns to itself. The other IP address is unique and can only be assigned by the DHCP server.

While investigating the settings on your SOHO router, you find two IP addresses reported on the device's routing table, which is used to determine where to send incoming data. The two IP addresses are 192.168.2.1 and 71.9.200.235. Which of these IP addresses would you see listed as the default gateway on the devices in your local network? How do you know?

192.168.2.1 is a type of private address. 71.9.200.235 is a general assigned address. So 192.168.2.1 is most likely the default gateway address.

Which of the following are valid IPv6 addresses? Select all that apply. a. fe80::64d2:bd2e:fa62:b911 b. fe80::g90p:bd2e:fa62:b911 c. fe80::64d2:bd2e::b911 d. ::1

A and D. fe80::64d2:bd2e: fa62: b911 is valid and proper format fe80: g90p:bd2e: fa62: b911 is not a valid as the second 8-bit group has an invalid hexadecimal number fe80::64d2:bd2e: bd911 is not valid as it has less bits than required ::1 is valid and represents a loopback address

Which of the following tools can be used to determine if a network cable is good? Choose all that apply. a.Cable tester b. Crimper c. Loopback plug d. Network multimeter

A, C and D A cable tester can test whether the network cable is working or not. A loopback plug can test if the network cable is faulty or not. A network multimiter can test the network cable by measuring voltage.

Which two of the following hosts on a corporate intranet are on the same subnet? a. 192.168.2.143 255.255.255.0 b. 172.54.98.3 255.255.0.0 c. 192.168.5.57 255.255.255.0 d. 172.54.72.89 255.255.0.0

B and D

You are configuring email on a customer's computer. Which port should you configure for pop.companymail.com? For smtp.companymail.com? a. 143, 25 b. 110, 143 c. 110, 25 d. 25, 110

C. POP uses 110 and SMTP uses 25

Your boss asks you to transmit a small file that includes sensitive personnel data to a server on the network. The server is running a Telnet server and an FTPS server. Why is it not a good idea to use Telnet to reach the remote computer? a. Telnet transmissions are not encrypted. b. Telnet is not reliable and the file might arrive corrupted. c. FTP is faster than Telnet. d. FTP running on the same computer as Telnet causes Telnet not to work.

Telnet transmissions are not encrypted.

While troubleshooting a network connection problem, you run the command ipconfig /all in a command prompt window and get the following output: Is the computer using a wired or wireless network connection? What is the local computer's MAC address? What is the IP address of the router on the local network?

The network is using an Ethernet adapter so the network is wired. MAC address is the same as the physical address, 54-53-ED-BB-AB-A3 IP address assigned by the local network to the router is the gateway address. 192.168.2.1

Your customer recently installed a new router in her dance studio, as shown in the diagram in Figure 8-56. She then ran Ethernet cables through the drop ceiling to computers in various offices. Without any further testing, which computers do you suspect are experiencing connection problems? Choose all that apply. a. Computer A b. Computer B c. Computer C d. None of them

computer B B is the farthest. The more the length of a cable, the lesser data rate it will have.

FTP requires confirmation that a file was successfully transmitted to a client, but it has no built-in mechanism to track this information for itself. What protocol does FTP rely on at the Transport layer of the TCP/IP model to ensure delivery is complete? a. UDP b. HTTP c. SSH d. TCP

d TCP

Your SOHO router has failed and you have installed a new router. The old router's static IP address on the network is 192.168.0.1. The new router has a static IP address of 10.0.0.1. You go to a computer to configure the new router and enter 10.0.0.1 in the browser address box. The router does not respond. You open a command prompt window and try to ping the router, which does not work. Next, you verify that the router has connectivity and you see that its local connection light is blinking, indicating connectivity. What is the most likely problem and its best solution? a. The computer you are using to configure the router has a corrupted TCP/IP configuration. Restart the computer. b. The router is defective. Return it for a full refund. c. The computer and the router are not in the same subnet. Release and renew the IP address of the computer. d. The computer and the router are not in the same subnet. Change the subnet mask assigned to the computer.

he computer and the router are not in the same subnet. Release and renew the IP address of the computer.