1
Q
- Why would a network administrator use plenum-rated cable during an installation? (Choose two.)
A. Low combustion temperature
B. High combustion temperature
C. Reduces toxic gas released during a fire
D. Is not susceptible to any interference
A
- B, C. Plenum-rated means that the cable’s coating doesn’t begin burning until a much higher temperature of heat, doesn’t release as many toxic fumes as PVC when it does burn, and is rated for use in air plenums that carry breathable air, usually as nonenclosed fresh-air return pathways that share space with cabling.
2
Q
2. Which of the following Ethernet Unshielded twisted-pair cabling types are commonly used? A. 10BaseT B. 100BaseTX C. 1000BaseTX D. All of the above
A
- D. UTP is commonly used in twisted-pair Ethernet like 10BaseT, 100BaseTX, 1000BaseTX, and so on.
3
Q
3. In which of the following categories is UTP cable not rated? A. Category 2 B. Category 3 C. Category 5e D. Category 8
A
- D. Unshielded twisted-pair has standards from Category 2 through 6 for use on Ethernet networks. There is no Category 8 defined.
4
Q
4. What type of connector does UTP cable typically use? A. BNC B. ST C. RJ-45 D. SC
A
- C. UTP usually connects with RJ-45. You use a crimper to attach an RJ connector to a cable.
5
Q
5. Which of the following provides the longest cable run distance? A. Single-mode fiber B. Multimode fiber C. Category 3 UTP D. Coax
A
- A. Single-mode fiber allows for the maximum cable run distances.
6
Q
6. You need to crimp on a connector using an RJ-45 connector. Which pin-out configuration would you use to connect a host into a switch? A. UTP B. Straight-through C. Crossover D. Rolled
A
- B. You would use a straight-through cable to connect a host to a switch, and the typical pin-out is called 568A.
7
Q
- Fiber-optic cable is immune to electromagnetic interference (EMI) and radio frequency interference (RFI) because it ___________________ .
A. Transmits analog signals using electricity
B. Transmits analog signals using light impulses
C. Transmits digital signals using light impulses
D. Transmits digital signals using electricity
A
- C. Fiber-optic cable transmits digital signals using light impulses rather than electricity; therefore, it is immune to EMI and RFI.
8
Q
8. What type of cable transmits lights from end to end? A. Coax B. Fiber-optic C. UTP D. Category 2
A
- B. Remember that fiber-optic cable transmits a digital signal using light impulses. Light is carried on either a glass or a plastic core.
9
Q
- What is the main difference between single-mode fiber (SMF) and multimode fiber (MMF)?
A. Electrical signals.
B. Number of light rays.
C. Number of digital signals.
D. Signal-mode can be run a shorter distance.
A
- B. The difference between single-mode fibers and multimode fibers is in the number of light rays (and thus the number of signals) they can carry. Generally speaking, multimode fiber is used for shorter-distance applications and single-mode fiber for longer distances.
10
Q
10. What type of cable should be used if you need to make a cable run longer than 100 meters? A. Category 5e B. Category 6 C. Fiber-optic D. Coaxial
A
- C. Standards limit UTP to a mere 100 meters. Different fiber-optic types have different maximum lengths, but fiber-optic is the only cable type that can extend well beyond 100 meters.
11
Q
11. Which of the following are fiber-optic connectors? (Select three.) A. BNC B. ST C. RJ-11 D. SC E. LC F. RJ-45
A
- B, D, E. There are many different types of fiber-optic connectors. SC, ST, LC, and MT-RJ are some of the more typical connectors in use today.
12
Q
12. You need to connect two devices on a vertical connect and they need to send voice traffic. Which of the following cable will you use? A. Cat 3 B. Cat 5 C. Cat 8 D. Rolled
A
- B. To connect two devices for voice on a vertical connect, the minimum cable you can use is Category 5.
13
Q
13. How many hosts on a half-duplex segment can talk at one time? A. 0 B. 1 C. 2 D. Unlimited
A
- B. In half-duplex communication, a device can either send communication or receive communication, but it cannot do both at the same time.
14
Q
14. Which type of cable does EMI have the least effect on? A. Coax B. Fiber-optic C. UTP D. STP
A
- B. Fiber-optic cable transmits only light (not electricity like UTP), so EMI has zero effect on it.
15
Q
15. How many devices can be connected to a full-duplex segment? A. 0 B. 1 C. 2 D. 4
A
- C. Full-duplex communication requires a point-to-point configuration because the collision-avoidance circuit is disabled.
16
Q
16. How many wires are used in a 100 Mbps UTP transmission? A. 2 B. 4 C. 6 D. 8
A
- B. Both wiring standards for UTP (568A and 568B) utilize only pins 1, 2, 3, and 6.
17
Q
17. A crossover cable is used to connect all of the following except \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_. A. Switch to switch B. Host to host C. Hub to switch D. Host to switch
A
- D. All devices that are pinned the same for transmit and receive require a crossover cable to communicate directly.
18
Q
- How is a T1 crossover cable crosses wired?
A. Pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2.
B. Pins 2, 3, 4, and 5 are connected to 4, 5, 1, and 2.
C. Pins 1, 2, 4, and 5 are connected to 3, 4, 5,and 6.
D. Pins 4, 5, 6, and 7 are connected to 4, 5, 1, and 2.
A
- A. A T1 cable uses T568B pairs 1 and 2, so to connect two T1 CSU/DSU devices back-to-back requires a crossover cable that swaps these pairs. Specifically, pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2, respectively.
19
Q
19. The purpose of the demarcation point is to separate the customer from whom? A. The branch office B. Headquarters C. The data center D. The service provider
A
- D. The demarcation point, or demarc, is the point at which the operational control or ownership changes from your company to a service provider. This is often at the MDF in relation to telephone connections and the CSU/DSU in regard to WAN connections.
20
Q
20. You need to make a 568B cable for a FastEthernet link. How many pairs will you use? A. 1 B. 2 C. 3 D. 4
A
- B. A 568B is an RJ-45 wiring standard and this type of cable uses two pairs of wires.
