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CompTIA Network+ > Cabling & Topology > Flashcards

Cabling & Topology Flashcards

1
Q

bus topology

A

uses a single cable (the bus) that connects all computers in a line

data from each computer goes out on entire bus

needs termination to prevent reflection from bringing down the network

single break - network down

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2
Q

ring topology

A

connects all computers with a ring of cable

data moves from 1 computer to the next in the same direction

no need for termination

single break - network down

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3
Q

star topology

A

uses a central connection box for all computers on the network

fault tolerance - 1 connection can be interrupted without affecting others

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4
Q

hybrid topology

A

any topology that combines a physical & (signaling) logical topology

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5
Q

physical topology

A

how cables appear physically in topology

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6
Q

signaling (logical) topology

A

how signals travel electrically in topology

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7
Q

2 topologies used in almost all wireless networks

A

mesh

point-to-multipoint

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8
Q

mesh topology

A

every computer connects to every other computer via 2 or more routes

fully meshed = every computer connects directly with ever other computer

partially meshed = at least 2 machines have redundant connections

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9
Q

point-to-multipoint topology

A

single system acts as a common source through which all members of network communicate

differs from star - central box is intelligent device

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10
Q

point-to-point topology

A

2 computers connected directly with no need for central device

wired or wireless

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11
Q

network technology

A

practical application of a topology & other critical technologies that provide a method to get data from 1 computer to another on a network

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12
Q

2 primary types of copper wiring

A

twisted pair

coaxial

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13
Q

coaxial cable

A

contains a conductor wire (usually copper) surrounded by a braided metal shield

radio grade (RG) rating

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14
Q

coaxial connector

A

F-connector

screws on to threaded port

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15
Q

cable modems connect with [blank] coax cable

A

RG-6

RG-59 (rarely, Cable TV)

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16
Q

Ohm rating

A

relative measure of the resistance on the cable

RG-6 & RG-59 rated at 75 Ohms

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17
Q

coax cables split with [ 1 ] joined with [ 2 ]

A

1 - splitter

2 - barrel connector

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18
Q

UTP twist benefit

A

reduces crosstalk

more twists = less crosstalk

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19
Q

shielded twisted pair (STP)

A

twisted pairs surrounded by shielding to protect wires from EMI

rare - excessive electronic noise

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20
Q

unshielded twisted pair (UTP)

A

twisted pairs surrounded by plastic jacket

no EMI protection

by far most popular modern cable

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21
Q

category (CAT) ratings

A

rating in megahertz (MHz) indicating highest frequency a cable can handle

used to select correct cable for the technology

22
Q

frequency of CAT ratings

A

number of cycles per second

23
Q

bandwidth

A

maximum amount of data that can move through a cable per second

24
Q

bandwidth - efficiency encoding schemes

A

maximizing bits into a signal as long as the cable can handle it

25
Q

UTP connectors

A

RJ-45 (4 pairs | networks)

RJ-11 (2 pairs | phones)

26
Q

fiber-optic core

A

glass fiber

27
Q

fiber-optic cladding

A

part that makes light reflect down the fiber

28
Q

fiber-optic buffer

A

material used to give cable strength

29
Q

fiber-optic cable

A

transmits light rather than energy

speed, distance, EMI resistance

core, cladding, buffer, insulating jacket

30
Q

fiber-optic cable sizing

A

different diameter core & cladding

2 number designator - measured in micrometers

62.5/125 is most common size

31
Q

fiber light transmission

A

regular light or laser

each require different type of cable

32
Q

fiber network installation requirements

A

pairs of fiber cables

1 to send - 1 to receive

duplex fiber cabling combines cables in 1 jacket

33
Q

MMF

A

multimode fiber

fiber-optic cable that uses LED to send signals

most common

34
Q

SMF

A

single-mode fiber

fiber-optic cable that uses lasers to send signals

35
Q

benefit of SMF over MMF

A

no modal distortion

36
Q

modal distortion

A

signals sent at the same time don’t arrive at the same time

signals differ slightly in length

37
Q

fiber-optic signal wavelengths

A

MMF - 850 nm

SMF - 1310 or 1550 nm

38
Q

fiber-optic connectors

A

ST - single, round, snap / twist

SC - single, square

LC - duplex, square

MT-RJ - duplex, square, slim

39
Q

classic serial cables

A

predates networking & PC

RS-232 - recommended standard upon which all serial communication takes place

slow connection speeds (56,000 bps)

only point-to-point

40
Q

serial connectors

A

9-pin - male D-subminiature (DB-9)

most common

41
Q

parallel cables

A

as old as serial cables

only point-to-point

up to 2 Mbps (much slower for networking)

42
Q

parallel connectors

A

25-pin female DB (DB-25)

43
Q

fire ratings - PVC

A

polyvinyl chloride

no significant fire protection

produces a lot of smoke & toxic fumes

44
Q

fire ratings - plenum

A

creates much less smoke & fumes

more expensive

usually required by ordinance

45
Q

standards defined by 802 committee

A

frames

speeds

distances

type of cabling

46
Q

IEEE 802.3

A

Ethernet

lots of subcommittees

47
Q

IEEE 802.11

A

Wireless LAN (WLAN)

specifications i.e. WiFi

many subcomittees

48
Q

CAT 3

A

16 MHz

16 Mbps

49
Q

CAT 5

A

100 MHz

100 Mbps

50
Q

CAT 5e

A

100 MHz

1,000 Mbps

51
Q

CAT 6

A

250 MHz

10,000 Mbps

100 m in 10/100/1000BaseT networks

55 m in 10GBaseT networks

52
Q

CAT 6a

A

500 MHz

10,000 Mbps

100 m in 10GBase T

CompTIA Network+ (9 decks)

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