Key Terms 3

Question 1

Cabling in which copper wires are twisted together for the purposes of canceling out EMI from external sources. BLANK cables are found in many Ethernet networks and telephone systems.

Answer 1

Unshielded twisted pair

Question 2

Twisted-pair cables are often shielded in an attempt to prevent RFI and EMI. This shielding can be applied to individual pairs or to the collection of pairs.

Answer 2

Shielded twisted pair

Question 3

Gradual loss in intensity of any kind of flux through a medium. As an electrical signal travels down a cable, the signal can degrade and distort or corrupt the data it is carrying.

Answer 3

Attenuation

Question 4

A signal on one channel of a transmission creates an undesired effect in another channel by interacting with it. The signal from one cable “spills over” into another cable.

Answer 4

Crosstalk

Question 5

Cable is jacketed with a fire-retardant plastic cover that does not release toxic chemicals when burned.

Answer 5

Plenum cables

Question 6

Each system connects to two other systems, forming a single, unidirectional network pathway for signals, thus forming a ring.

Answer 6

Ring topology

Question 7

Systems are connected to a single transmission channel (i.e., network cable), forming a linear construct.

Answer 7

Bus topology

Question 8

Network consists of one central device, which acts as a conduit to transmit messages. The central device, to which all other nodes are connected, provides a common connection point for all nodes.

Answer 8

Star topology

Question 9

Network where each system must not only capture and disseminate its own data, but also serve as a relay for other systems; that is, it must collaborate to propagate the data in the network.

Answer 9

Mesh topology

Question 10

Common LAN media access technology standardized by IEEE 802.3. Uses 48-bit MAC addressing, works in contention-based networks, and has extended outside of just LAN environments.

Answer 10

Ethernet

Question 11

LAN medium access technology that controls network communication traffic through the use of token frames. This technology has been mostly replaced by Ethernet.

Answer 11

Token ring

Question 12

Ring-based token network protocol that was derived from the IEEE 802.4 token bus timed token protocol. It can work in LAN or MAN environments and provides fault tolerance through dual-ring architecture.

Answer 12

Fiber Distributed Data Interface

Question 13

A media access control method that uses a carrier sensing scheme. When a transmitting system detects another signal while transmitting a frame, it stops transmitting that frame, transmits a jam signal, and then waits for a random time interval before trying to resend the frame. This reduces collisions on a network.

Answer 13

Carrier sense multiple access with collision detection

Question 14

A media access control method that uses a carrier sensing scheme. A system wishing to transmit data has to first listen to the channel for a predetermined amount of time to determine whether or not another system is transmitting on the channel. If the channel is sensed as “idle,” then the system is permitted to begin the transmission process. If the channel is sensed as “busy,” the system defers its transmission for a random period of time.

Answer 14

Carrier sense multiple access with collision avoidance