1. You receive a call from one of your clients who is experiencing a network lay
ID: 3540213 • Letter: 1
Question
1. You receive a call from one of your clients who is experiencing a network layer problem on his three-segment internetwork. You ask how she knows it is a network layer problem. The client says that her users can access all of the servers on the company internetwork, but they cannot access the Internet, which is connected through a router. Is the client right or wrong in assuming that there is a network layer problem? Why?
a. The client is wrong, because a network layer problem at the router that connects to the Internet would prevent the users from accessing servers on other local area networks (LANs).
b. The client is wrong, because the users should be able to access the Internet, despite a network layer problem.
c. The client is right, because Internet access is provided by a router, which has probably malfunctioned with hardware problems.
d. There is no way to tell if the client is right or wrong from the information given.
2. The Lee family has three computers in the house: Mom%u2019s desktop, Dad%u2019s laptop, and another desktop shared by the kids. They decide to build a 100Base-T Ethernet network to connect their computers together so Dad and the kids can print documents on the printer in Mom%u2019s home office. Which of the following components do they have to install to achieve this goal? (Choose all answers that are correct.)
a. Network interface cards (NICs)
b. A hub or switch
c. A multistation access unit (MAU)
d. Unshielded twisted-pair (UTP) cables
3. A large campus internetwork for a university currently consists of a fiber optic backbone connecting all of the buildings together and separating Ethernet local area networks (LANs) for each of the scholastic departments, all connected to the backbone by routers. Each department LAN has its own servers and workstations connected to a single hub, and the majority of the traffic on the internetwork is generated by workstations accessing their departmental servers. However, there are also campus-wide e-mail and accounting services that are implemented on servers connected to the LAN in the university%u2019s computer center, which are accessed by users throughout the installation. Which one of the following modifications to the current internetwork configuration will most likely provide the greatest improvement in workstations%u2019 performance?
a. Split each LAN in two by installing a local transparent bridge.
b. Replace the routers connecting each LAN to the backbone with a multiport switch.
c. Replace the hub on each departmental LAN with a switch.
d. Move the e-mail and accounting servers from the computer center LAN to the backbone.
Explanation / Answer
c. The client is right, because Internet access is provided by a router, which has probably malfunctioned with hardware problems.
b. A hub or switch
c. Replace the hub on each departmental LAN with a switch.
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