Network+ Study Guide

2017-07-07 02:10:07

1.	Which of the following are characteristic of a peer-to-peer network? (Choose all that apply.) It has centralized security and administration. A computer can be both a client and a server. A limited number of computers are involved. It does not require a hub.
2.	The best cable choice for linking a few computers in a small office using a bus Ethernet network is cable with an ___________________ designation. RG-47 RG-58 RG-59 RG-62
3.	Which of the following are characteristic of a true client/server environment? (Choose all that apply.) It does not require a hub. A computer can be both a client and a server. It has centralized security and administration. It has a centralized backup.
4.	A network that uses 10Base2 requires ___________________ terminators for each network segment in order to function correctly. 0 1 2 3
5.	Which of the following is characteristic of a mesh network? It controls cable costs. It offers improved reliability. It is required by fire code. It needs a token to operate.
6.	Which type of network topology uses terminators? Star Bus Ring Mesh
7.	Which of the following best describes a star topology? It has centralized management. Any cable fault halts all network traffic. It uses less cable than a bus or ring. It is always completely wireless.
8.	A client/server approach uses what type of security model? Centralized Decentralized Server Distributed
9.	In a Thick Ethernet network, what typically connects the NIC’s transceiver to the backbone cable? Screws DIX Vampire Taps Bolts
10.	Plenum cable has which of the following characteristics? It has a lower cost than PVC. It meets fire codes. It transmits data faster. All the above.
11.	Which of the following is the most widely used LAN wiring system for connections between desktop and server? STP UTP Coax Fiber-optic
12.	Which of the following has the highest possible throughput? STP UTP Coax Fiber-optic
13.	Which 100-Megabit Ethernet standard is designed to use two pairs of wires in a UTP cable? 100BaseVG 10BaseF 100BaseT4 100BaseTX
14.	A transmission technology that divides that transmission medium into discrete channels so that multiple signals can share the same cable is known as ___________________. Duplex communications Baseband communications Sideband communications Broadband communications
15.	What is the primary advantage to network attached storage (NAS) devices over a “traditional” server? NAS devices have smaller monitors. NAS devices are less expensive. NAS devices contain more storage. All the above.
16.	An RJ-45 connector should be wired with ____________________ pairs when used on a Category 5 UTP cable. 1 2 4 8
17.	Thicknet can be extended to ___________________ meters per segment. 100 200 500 1000
18.	Which network component is used in conjunction with a router to provide access to a T1 circuit? Gateway T1 modem CSU/DSU Switch
19.	Failure to terminate a bus topology properly will result in _________. Electrical shock hazard Unwanted signal echo Fire hazard All the above
20.	What device must you install in a computer to provide it with a physical, an electrical, and an electronic connection to a network? Router NIC Gateway BNC connector

Answers

1.	B, C. Computers participating in a peer-to-peer network can be either client or server or both. Additionally, the peer-to-peer model has some practical limitations, including the number of computers involved. Answer A is incorrect, because the administration is not centralized. Answer D is incorrect because some peer-to-peer networks do use hubs.
2.	B. The only coax cable designation that should be used with Ethernet is RG-58. Other cable types (like RG-62) won’t meet the specifications for Ethernet.
3.	C, D. Answers C and D are correct, because in a true client/server environment, the server contains all the data and administration information. But it is just a server. It cannot run client applications (like word processing). Answer A is also incorrect, as a true client/server environment can use a hub, but it can also use a bus topology.
4.	C. Ethernet 10Base2 requires coaxial cable, which requires two terminators: one at the beginning of the network segment, and one at the end.
5.	B. The major advantage to mesh networks is their increased reliability. There are multiple redundant connections between all nodes in the network. Answer A is incorrect because the cable costs are much, much more than other networks. Answer C is simply a distracter; mesh is not required by fire codes. Answer D is incorrect, because most token-based networks could not operate in a mesh environment.
6.	B. The only type of network topology that uses terminators is the bus topology.
7.	A. The main advantage of a star topology is the fact that there is a central device (the hub) that controls and manages the physical aspects of the network. It doesn’t use less cable than a physical bus or physical ring. In fact, it uses more. Additionally, if there’s a cable fault, the hub will shut down traffic to that port, thus allowing the network to continue operating.
8.	A. In a centralized security model, one center entity (usually the server) maintains and controls the security information for the entire network.
9.	C. Vampire taps are used in Thick Ethernet to connect transceivers directly to the Thicknet cable.
10.	B. Answer B is the only correct answer. Plenum cable actually has a higher cost than PVC. Additionally, because the conductors are also made of copper, it doesn’t conduct data any faster than PVC-coated cable.
11.	B. Although fiber-optic, STP, and coax are all good choices for this application, UTP is currently the most popular due to its versatility, low cost, and ease of installation. Fiber-optic is quickly replacing UTP, but the cost is still somewhat prohibitive.
12.	D. Although all methods have megabit performance, fiber-optic has the greatest throughput potential.
13.	D. Answer D is the 100-Megabit standard that uses only two pairs of wires (four wires total). Answers A and C use all four pairs of a standard UTP. 10BaseF is a 10-Megabit standard, and it uses fiber-optic cable instead of UTP.
14.	D. In broadband communications (television communications, for example), the communications medium is divided into discrete channels. Each channel can carry its own signal. In baseband communications, the transmission takes up the whole communications channel. Duplex communications are where a sender and receiver can each send and receive signals simultaneously. Sideband is a distracter.
15.	B. Although, technically, NAS devices do have smaller monitors and do contain more storage than a workgroup server, their primary advantage over a traditional server is that they contain just as much storage as a workgroup server (and sometimes more) for a significantly lower cost.
16.	C. Although you can wire any combination of pairs in an RJ-45 connector, you should wire all four pairs in a Category 5 UTP into an RJ-45 connector to support those network technologies that may need all four pairs (such as 100BaseT), even if you aren’t currently using them.
17.	C. The maximum segment length for 10Base5 is 500 meters.
18.	C. The Channel Service Unit/Data Service Unit (CSU/DSU) translates LAN signals into signals that are used on T1 lines. Some people incorrectly call it a “T1 modem.” It’s not a modem because it doesn’t translate data into analog and back. Every signal stays in the digital format.
19.	B. If one or both of the ends of a bus cable are not terminated, the network signal will reflect off the end of the cable and interfere with the signal already present, causing problems. The terminator absorbs this echo, preventing the problem. Electrical shock and fire hazards are not problems that result from a failure to install the terminator(s).
20.	B. The Network Interface Card (NIC) is responsible for providing the physical, electrical, and electronic connections to the network. Routers and gateways are devices on the network. A BNC connector is a type of physical connector on a bus network.

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