DV Chapter 4

Question 1

NIC

Answer 1

Network interface cards (NICs) connect a device to the network

Question 2

True or false? The physical layer is only concerned with wired network connections.

true or false

Answer 2

false

Question 3

The physical layer standards address three functional areas:

Answer 3

Physical Components
Encoding
Signaling

Question 4

Encoding

Answer 4

encoding or line encoding is a method of converting a stream of data bits into a predefined “code”.

Question 5

Terms used to measure the quality of bandwidth include:

Answer 5

Latency
Throughput
Goodput

Question 6

Latency

Answer 6

Latency refers to the amount of time, including delays, for data to travel from one given point to another.

Question 7

Throughput

Answer 7

Throughput is the measure of the transfer of bits across the media over a given period of time.

Question 8

Goodput

Answer 8

There is a third measurement to assess the transfer of usable data; it is known as goodput. Goodput is the measure of usable data transferred over a given period of time. Goodput is throughput minus traffic overhead for establishing sessions, acknowledgments, encapsulation, and retransmitted bits. Goodput is always lower than throughput, which is generally lower than the bandwidth.

Question 9

EMI

Answer 9

Electromagnetic interference

Question 10

RFI

Answer 10

radio frequency interference

Question 11

a disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in an adjacent wire.

Answer 11

Crosstalk

Question 12

Fiber-optic cables are broadly classified into two types:

Answer 12

Single-mode fiber (SMF)
Multimode fiber (MMF)

Question 13

Purpose of the Physical Layer

Answer 13

Before any network communications can occur, a physical connection to a local network must be established.

Question 14

Physical Layer Characteristics

Answer 14

The physical layer consists of electronic circuitry, media, and connectors developed by engineers. The physical layer standards address three functional areas: physical components, encoding, and signaling.