11A

Question 1

The _____________ is how data travels from one component or device to another. This can be done by cable or by wireless such as RF or light.

Answer 1

physical environment

Question 2

A LAN using coaxial cable, twisted-pair cable, and/or fiber optic cable is using __________.

Answer 2

guided media

Question 3

Impairments in guided transmission lines can create __________, which degrades the analog and digital signal quality

Answer 3

distortion

Question 4

________________ does not use a physical means but relies instead on
radio waves or light transmissions.

Answer 4

Unguided media

Question 5

_________ cables are the oldest and most used types of transmitting data.

Answer 5

Copper

Question 6

The copper wire in the cables could be ____________ together to form the individual wire in the cable

Answer 6

solid or stranded twisted

Question 7

Twisted-Pair Cable is the ____________ media for network connectivity.

Answer 7

most common

Question 8

Twisted-pair cable consists of…?

Answer 8

solid insulated wires twisted in the cable

Question 9

The twisted-wire configuration limits signal degradation from…?

Answer 9

electromagnetic interference (EMI) and radio frequency interference (RFI).

Question 10

Twisted-pair cable has ____________ governing the number of twists or braids permitted per meter.

Answer 10

precise specifications

Question 11

Twisted-pair is a copper, wire-based cable that can be either ___________.

Answer 11

shielded or unshielded

Question 12

What does UTP stand for?

Answer 12

Unshielded Twisted Pair

Question 13

UTP has become the most ___________ choice among networking cables

Answer 13

economical

Question 14

In most cases, UTP cable is implemented using inexpensive, modular
telephone-type connectors such as the ______ (two pair, common telephone) and the ______ (four pair, data) connectors.

Answer 14

RJ-11 and the RJ-45

Question 15

UTP contains ______ insulated wires.

Answer 15

eight

Question 16

In UTP, ________ are twisted together, a precise number of
turns per meter, to form a pair.

Answer 16

two insulated wires

Question 17

The ANSI specifies categories of UTP in terms of _______ they can sustain.

Answer 17

data rates

Question 18

Categories describe the media as well as the types of ________ to be used.

Answer 18

connectors

Question 19

What are the “pin layouts”?

Answer 19

The pin layouts are TIA based standards using the T-586A standard for network cables

Question 20

What are the three basic configurations for pin layouts?

Answer 20

Straight through, cross over, roll over

Question 21

Describe straight through pin layout

Answer 21

Pins on end of the cable match. A Straight Through cable is used to connect two unlike devices, such as a PC to a switch.

Question 22

Describe cross-over pin layout

Answer 22

TX and RX pins are swapped on the opposite end of the cable. A Cross-Over cable is used to connect like devices, such as switch to switch.

Question 23

Describe roll over pin layout

Answer 23

Pins are exactly opposite on the ends of the cables. The Roll Over cable is commonly referred to as a console cable and is used to connect a PC to the console port of a switch or router.

Question 24

What does STP stand for?

Answer 24

Shielded Twisted Pair

Question 25

What is STP?

Answer 25

STP cable combines the techniques of shielding and twisting of wires to protect against signal degradation.

Question 26

STP contains _____ pairs of wire.

Answer 26

four

Question 27

Each pair of wire is twisted together a precise number of turns per meter. Each pair is then wrapped, as a pair, in ______________.

Answer 27

insulating metallic foil

Question 28

After being wrapped in metallic foil, the four insulated pairs are then wrapped together in metallic braid or foil called the _______

Answer 28

jacket

Question 29

The major benefit of STP is that it reduces...?

Answer 29

reduces electrical noise both within the cable (pair-to-pair crosstalk) and outside the cable (Electromagnetic Interference and Radio Frequency Interference).

Question 30

With fiber optics, technology converts electrical signals (ones and zeros [binary] into ___________ (on and off lighting).

Answer 30

optical signals

Question 31

Optical signals are transmitted through a thin glass fiber. These signals are converted back into ________ at the receiving end.

Answer 31

electrical signals

Question 32

Because these transmissions are light-based instead of electrical based, fiber is immune to all types of electromagnetic (EMF) monitoring because...?

Answer 32

There is no EM radiation

Question 33

What are the two types of fiber optic cable?

Answer 33

Multi-Mode and Single-mode

Question 34

Multi-mode fiber typically has a core diameter of _________. This relatively large core allows many modes, or paths, of light to propagate down the optic path producing good coupling from inexpensive couplers, connectors, and LED light sources.

Answer 34

Multi-mode fiber typically has a core diameter of 50 to 100 microns.

Question 35

Two types of multi-mode fiber exist, which are?

Answer 35

graded and stepped

Question 36

Multi-mode fiber supports ________ than twisted-pair wire.

Answer 36

longer segment lengths

Question 37

Multi-mode fiber can support segment lengths as long as ______ meters for 10 and 100 Mbps Ethernet, and _____ meters for 1 Gbps Ethernet.

Answer 37

2000 550

Question 38

Single mode fiber, shown in Figures 11-5 and 11-6, uses a glass fiber that is approximately _________ in diameter and permits a single mode of light to be propagated using expensive lasers as the light source.

Answer 38

10 microns

Question 39

________ can support much longer segments than any other guided media.

Answer 39

Single-mode fiber

Question 40

_________ transmissions are wireless.

Answer 40

Unguided/unbound

Question 41

_______________ can impair your wireless transmission, degrading both analog and digital signal quality.

Answer 41

Atmospheric conditions

Question 42

The most used wireless media are...?

Answer 42

light transmissions and radio waves

Question 43

Light transmissions use ______ to transmit and receive network signals.

Answer 43

lasers

Question 44

Since laser transmissions use a focused beam of light, they require a _________ and _________ between the devices.

Answer 44

clear line of sight and precise alignment

Question 45

Radio waves may be land-based or _____-based transmissions.

Answer 45

space-based

Question 46

Radio transmission signals originate from a land-based system but are transmitted to _____________.

Answer 46

satellites

Question 47

Radio waves used for networking purposes are typically microwave frequencies in the ____________ range.

Answer 47

1-20 gigahertz (GHz)

Question 48

Radio wave signals can be ____________ or _____________ in nature.

Answer 48

fixed frequency or spread spectrum

Question 49

With fixed frequency signals, the information you wish to transmit is superimposed onto a RF carrier, which increases ______ and _______ of the signal.

Answer 49

power and range

Question 50

Security of fixed frequency signals is poor because...?

Answer 50

once the carrier frequency is known, fixed frequency signals are easy to monitor and/or jam.

Question 51

What is an example of a fixed-frequency signal?

Answer 51

a radio station

Question 52

Spread spectrum signals is a transmission technique that transmits a signal across a broad frequency bandwidth and...?

Answer 52

varies as the RF carrier frequency varies

Question 53

What are some reasons for using the spread spectrum signals technique?

Answer 53

To secure communications, to increase resistance to natural interference, noise, and jamming

Question 54

What are the advantages of unguided media?

Answer 54

1. Mobility - there is no physical cabling to tie down the location of a node on a network; a portable computer can truly be portable 2. Relocatable - Moving a wireless node is easy compared to the large amount of labor required to add or move cabling in a guided or bound type of network.

Question 55

What are the disadvantages of unguided media?

Answer 55

1. Security: Security is poor. Signals are more susceptible to interception and monitoring. 2. Distortion and Interference: Susceptible to interference and distortion from lights, electronic devices, and atmospheric conditions. 3. Speed: Slower speed than guided media LAN’s

Question 56

T-568A standard is what color wire?

Answer 56

Green

Question 57

T-568B standard is what color wire?

Answer 57

Orange