Ingleses, alemanes, austriacos y su aporte a la difusión

Page Lesson 1 Review

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1. Which of the following statements about a network’s infrastructure is true?

a. A network infrastructure includes hardware products only.

b. A network infrastructure includes software products only.

c. A network infrastructure includes both hardware and software products.

d. A network infrastructure is a design that does not include specific hardware or software products.

c

2. Which type of network infrastructure includes the selection of the network and transport layer protocols that are to be used on the network?

The logical infrastructure

3. Maintaining a network infrastructure includes which of the following processes? (Choose three.)

a. Updating the network

b. Troubleshooting the network

c. Implementing the network

d. Monitoring the network a, b, and d

Page Lesson 2 Practice

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For each of the following situations, specify which Ethernet variation you would rec­ ommend and provide a reason for your selection.

1. A legacy Category 3 UTP cable installation.

10Base-T, because this is the only Ethernet variation that can use Category 3 UTP cable.

2. A high-bandwidth backbone network 1,000 meters long.

1000Base-LX Gigabit Ethernet with single-mode fiber-optic cable, because this is the only high- bandwidth Ethernet variation that supports a 1,000-meter cable length.

3. A Fast Ethernet LAN connecting 50 workstations in a factory environment with large amounts of electromagnetic interference.

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Page 1-29

Lesson 2 Review

1. Data-link layer protocols used on LANs, such as Ethernet, include functions asso­ ciated with which two layers of the OSI reference model?

The physical and data-link layers.

2. What phenomenon never occurs on a properly functioning Token Ring network but is a normal occurrence on an Ethernet network?

Collisions.

3. List two advantages and two disadvantages of using fiber-optic cable to build a network.

Advantages: Fiber-optic cables are immune to electromagnetic interference, can span longer distances, and are inherently more secure than copper cables. Disadvantages: Fiber-optic cables are more expensive than copper, more difficult to install, and require specialized tools.

Lesson 3 Review

1. Which of the following network/transport layer protocols can you use for Windows file sharing when installed alone?

a. TCP/IP only

b. TCP/IP and NetBEUI only

c. TCP/IP and IPX only

d. TCP/IP, IPX, and NetBEUI d

2. Under what conditions would a network designer be obliged to install the IPX protocol suite on workstations using Windows operating systems?

The IPX protocols are required on workstations using Windows operating systems only when it is necessary to connect with NetWare servers earlier than version 5 or running IPX only.

3. Which of the following are connection-oriented protocols? (Choose all that apply.)

a. NetWare Core Protocol (NCP)

b. Transmission Control Protocol (TCP)

c. Sequenced Packet Exchange (SPX)

d. User Datagram Protocol (UDP) b and c

Page Lesson 4 Practice 1-35

For each of the following pieces of information, give a reason why a network infra­ structure blueprint would contain that information.

1. Locations of fluorescent light fixtures

For a network that uses copper-based cables, fluorescent light fixtures can be a significant source of electromagnetic interference. A network blueprint should contain the locations of these fixtures so that the network designer can route cables around them.

2. Cable color

For a network using an external cable installation, matching the cable color to the wall color can help make the cables less visible.

3. Ceiling height

Cable length measurements must include vertical as well as horizontal distances. Specifying ceiling height enables the network designer to account for vertical cable runs from the ceiling down to the wall plate.

4. Size of cable conduits running between floors

The configuration of a large network in a building with several floors can be partially dependent on the amount of space available to run cables between floors. If this space is limited, it might not be practical to run a large number of cables to centrally located hubs in a data center. The designer might have to locate individual hubs on each floor instead.

5. Locations of locked rooms and closets

In most cases, it is best to place servers, hubs, routers, and other critical or expensive devices in physically secure locations. A network blueprint should specify these secure locations.

Page Lesson 4 Review

1. List one piece of information that a diagram of an external cable installation needs that an internal installation diagram does not need.

The diagram should specify where and how the cables are to be secured.

2. Which of the following is the term for a LAN that connects all the computers on a single floor of a building?

a. Backbone network b. Horizontal network c. Internetwork d. Patch panel b 1-36

3. What negative result can occur when you connect an enterprise server to a hori­ zontal network?

The horizontal network on which the server is located can be overloaded with traffic from all the other horizontal networks.

Page Case Scenario Exercise

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1. Specify which floor of the building is best suited for each of the three departments listed and give your reasons why.

The first floor is best suited to the outside sales department, because it provides individual offices for the salespeople’s meetings, and because it is wired with Category 5 cable, providing the potential for more bandwidth to support more elaborate applications required by the users. The second floor is best suited to the inside sales call center, because it already has cubicles in place that are wired with Category 3 UTP. This cable supports a 10Base-T network, which is sufficient for the users’ needs. The third floor is best suited to the research and development department, because the fiber-optic cable provides the combination of high bandwidth and security that these users need.

2. Which of the three departments to be housed in the new building could best make use of a wireless network medium? Why?

The outside sales department could best make use of a wireless network medium, because the salespeople use portable computers. A wireless network would enable them to access net- work resources from any location in their department.

3. Which of the three floors has the most secure cable installation at the present time? Why?

The third floor is currently the most secure, because it uses fiber-optic cable, which cannot eas­ ily be tapped.

4. Assuming that you plan to use Ethernet throughout the building, which variant would you use on each floor? Why?

The Category 5 UTP cable on the first floor supports 100Base-TX Fast Ethernet, which is the current standard for horizontal Ethernet networks. The Category 3 UTP cable installed on the second floor network can’t support Fast Ethernet, so you must use 10Base-T Ethernet. The fiber-optic cable on the third floor supports 100Base-FX Fast Ethernet, providing sufficient bandwidth for the R&D users.

5. Apart from the computers themselves, what connectivity components must Lit- ware install on each of the three networks in the building to make it a functioning Ethernet network?

6. What components would you have to add to the plan to connect the LANs on each of the three floors to a single 1000Base-T Gigabit Ethernet backbone network? To connect the three horizontal networks to a 1000Base-T backbone, you must install a router on each of the three networks and connect each of the three routers to a 1000Base-T hub using a length of UTP cable rated at least Category 5.

7. Assuming that all three networks are connected to a single backbone, on which network would it make the most sense to connect the server hosting the com­ pany’s customer database? Explain your answer.

a. The first floor network

b. The second floor network

c. The third floor network

d. The backbone network

d, because users on the first and second floor networks have to access the customer data- base, and connecting the server to the backbone prevents any one of the horizontal networks from being flooded with database traffic from the other networks.

8. Assuming that all three networks are connected to a single backbone, which would be the best network/transport layer protocol to use for the entire internet- work? Why are the other available protocols less suitable?

TCP/IP is the best protocol suite to use for the internetwork. IPX is less suitable because it is designed for use with Novell NetWare servers. NetBEUI is less suitable because it does not support routing traffic between networks.

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Planning a TCP/IP Network