Network Troubleshooting 8

Ralph is troubleshooting a workstation that cannot access the network. The workstation is plugged into a wall plate that should provide it with access to a DHCP-equipped network using the 192.168.4.0/24 network address. No one else on that network is reporting a problem. Ralph checks that the patch cable is properly plugged into the workstation and the wall plate, which they are, and then runs ipconfig /all on the user's workstation and examines the output. Which of the following could be the explanation for the user's problem, based on these ipconfig results?

• The Subnet Mask is incorrect.

• The Default Gateway address is missing.

• The DHCPv4 scope is exhausted.

• The DNS server addresses are incorrect.

Ralph is troubleshooting a workstation that cannot access the network. The workstation is plugged into a wall plate that should provide it with access to a DHCP-equipped network using the 192.168.32.0/20 network address. Ralph checks that the patch cable is properly plugged into the workstation and the wall plate, which they are, and then runs ipconfig /all on the user's workstation and examines the output. Which of the following could be the explanation for the user's problem, based on these ipconfig results?

• The IPv4 Address setting is incorrect.

• The Subnet Mask setting is incorrect.

• The Default Gateway setting is incorrect.

• The DNS Servers setting is located on another network.

Ralph is troubleshooting a workstation that cannot access the network. The workstation is plugged into a wall plate that should provide it with access to a DHCP-equipped network using the 192.168.4.0/24 network address. Ralph checks that the patch cable is properly plugged into the workstation and the wall plate, which they are, and then runs ipconfig /all on the user's workstation and examines the output. Which of the following could be the explanation for the user's problem, based on these ipconfig results?

• The workstation could not connect to a DHCP server.

• There is a rogue DHCP server on the network.

• The workstation is not configured to use DHCP.

• The IP address assigned by the DHCP server has expired.

Ralph is responsible for the network installation in a new building purchased by his company, and he has elected to have Category 6 (Cat 6) Unshielded Twisted Pair (UTP) cable installed. The company president has asked him if it is possible to run their Gigabit Ethernet network using two of the wire pairs in the cable, while using the other two pairs for telephone connections. Ralph is not sure, so he sets up a lab network using cables with only two pairs connected. When he plugs computers into the switch and turns them on, the Light-Emitting Diodes (LEDs) labeled 1000 light up, indicating that a Gigabit Ethernet connection has been established. Ralph gets excited at the thought of how much money he might save the company by using the same cable for both telephone and data. However, while the LED is lit, he cannot seem to connect to another system over his test network. Which of the following describes what he must do to correct the problem?

• Ralph must manually configure the network adapters to use Gigabit Ethernet, rather than let them autonegotiate.

• Ralph is using the wrong two wire pairs for the Gigabit Ethernet connection. He must rewire the connectors.

• Ralph is using the wrong pinout standard on his lab network. He must use T568A.

• Ralph must use all four wire pairs for a Gigabit Ethernet connection.

Ed is inspecting the cable runs recently installed for some new Gigabit Ethernet systems on his network. Looking at the patch panel connections, he notices that they are wired using the T568B pinout standard. However, when he examines the wall plate connections, he sees that they are wired using the T568A standard. What is the best way for Ed to resolve the problem?

• Call the contractor and have all of the wall plate connectors rewired using the T568B standard.

• Purchase crossover patch cables for all of the connections between the patch panel and the switches.

• Configure the switches to not use a crossover circuit for all of the ports connected to the patch panel.

• Do nothing. The cable runs will function properly as is.

Ralph has two computers that he long ago networked together by plugging one end of an Ethernet cable into each machine. He recently bought an old Ethernet hub at a garage sale and wants to use it to expand his network. The hub has four numbered ports and a fifth port marked with an X. Ralph plugs one computer into port 1 using his existing cable and buys a new cable to plug the other computer into port 4. The two computers cannot communicate, however. Which of the following solutions will not enable his computers to communicate?

• Move the port 4 cable to port 2

• Replace the old cable with a second new one

• Plug the computer with the old cable into the X port

• Plug the computer with the new cable into the X port

Ralph recently bought an old Ethernet hub and some twisted-pair cables at a garage sale and wants to use them to build a home network. He plugs two computers into the hub using the cables but finds that the computers are unable to communicate. Then he notices that one of the ports in the hub is labeled with an X. He tries plugging one of the computers into the X port, and now they can communicate. Which of the following statements is the most likely explanation for this behavior?

• The hub has a bad port.

• One of the cables is a crossover cable.

• Both of the cables are crossover cables.

• The X port provides extra strength to the signals.

Alice is a consultant who has been hired to move a client's old 20-node coaxial Ethernet network to a new location. She disassembles all of the network cabling and other components and packs them for shipping. At the new site, she sets up all of the computers, plugs a T-connector into each network adapter, and connects the cables, running them from one computer to the next to form the bus. When Alice is finished, she starts the computers and tests their network connectivity. She finds that 12 consecutive computers can communicate with each other, and the other 8 can communicate with each other, but the 12 cannot communicate with the 8. She makes sure that all of the connectors are securely tightened, especially the ones on the 12th computer, but the problem persists. Which of the following is the most likely cause of the difficulty?

• Alice has forgotten to terminate the computers at each end of the bus.

• One of the connectors on the 12th computer has a bent pin.

• Alice has forgotten to ground the network.

• The transmit and receive pins are reversed on the 12th computer.

Ed is troubleshooting some network performance problems. After exhausting many other possibilities, he is examining the twisted-pair cable runs in the office's drop ceiling. He finds that some cables have been damaged, apparently by electricians working in that space. In some cases, the cable sheath has been split along its length, and some of the insulation on the wires inside has been scraped off as well. Which of the following types of faults might be caused by this damage? (Choose all that apply.)

• Open circuits

• Short circuits

• Split pairs

• Transposed wires

Which of the following types of interference on a twisted-pair network are designed to be prevented by the twists in the wire pairs inside the cable?

• Crosstalk

• EMI

• Attenuation

• Latency