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CompTIA Network+ > Installing a Physical Network > Flashcards

Installing a Physical Network Flashcards

1
Q

structured cabling

A

standards developed by the TIA/EIA for the installation of network cables

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2
Q

components of structured cabling

A

telco room

horizontal cabling

work area

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3
Q

telco room

A

all cables from computers in the work area lead to this location

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4
Q

horizontal cabling

A

cables running horizontally from PCs to telco room

most of the cabling

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5
Q

run

A

a single piece of horizontal cabling

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6
Q

work area

A

office or cubicle that potentially contains a PC or phone

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7
Q

solid core cabling

A

single solid wire

better conductor

stiff & will break if handled too often or too roughly

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8
Q

stranded core cabling

A

several tiny wires bundled together

not as good of a conductor

more resistant to breaking

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9
Q

TIA/EIA specifies that horizontal cabling should always be [blank]

A

solid core

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10
Q

current standard for number of wires

A

4 pairs

CAT 5E & up are 4-pair-only cables

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11
Q

IDF

A

intermediate distribution frame

another name for telco room

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12
Q

width of all equipment racks

A

19 in

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13
Q

U

A

unit

1.75” height standard for rack-mountable equipment

1U, 2U, etc.

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14
Q

patch panel

A

box with a row of female ports in the front & permanent connections in the back

prevents continuous movement of solid core cables

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15
Q

110 block

A

110-punchdown block

special connector used by patch panels

wires connected using a punchdown tool

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16
Q

TX/RX reversed

A

inadvertent creation of cross-over cable by switching the sending / receiving wires

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17
Q

66-punchdown block

A

older technology used in about every commercial phone installation

produces more cross-talk

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18
Q

patch cable

A

short segment of straight-through UTP stranded core cable

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19
Q

[blank] also have CAT ratings

A

female RJ-45 wall jack outlets

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20
Q

TIA/EIA max allowed cable length

A

90 m

leaves 10 m for patch cable connection in work area

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21
Q

demarc

A

demarcation point

point at which exterior network connections enter the building

line between responsibility of ISP / phone provider & internal network

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22
Q

NIU

A

network interface unit

modem supplied by ISPs & phone providers for use in private home

serves as demarc

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23
Q

smart jacks

A

NIUs that have the ability to alert the provider when a disconnect occurs

may also set up a remote loop-back for remote testing

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24
Q

CPE

A

customer premise equipment

box (owned by customer) into which all cables from the demarc enter

primary distribution tool for the building

25
Q

multiplexer

A

special CPE used in phone systems

26
Q

LAN CPE

A

usually a powerful switch connected to a patch panel

patch panel typically leads to every telco in the building

27
Q

vertical cross-connect

A

primary patch panel for a building

28
Q

MDF

A

main distribution frame

room that stores the demarc, phone cross-connects, & LAN cross-connects

29
Q

planning physical cable install

A

blue print / floor plan critical

map the runs

30
Q

cable drop

A

location where the cable exits the wall in the work area

single run of cable running from telco room to a wall outlet

new run coming through a wall outlet that does not yet have a jack installed

31
Q

determining location of telco room

A

distance - won’t require runs over 90 m

adequate power supply - dedicated circuit if possible

avoid humid locations

means of keeping room cool

access - stop unauthorized - allow authorized

scalability for growth

32
Q

always [blank] patch panels

A

carefully label

33
Q

crosstalk

A

signal sent down paired wire is picked up by other wires

34
Q

NEXT

A

near-end crosstalk

closer to end of cable from which signal emanates

35
Q

FEXT

A

far-end crosstalk

further from the end of the cable from which signal emanates

36
Q

attenuation

A

weakening of a signal as it travels down a wire

signal becomes more susceptible to crosstalk

37
Q

signal loss / degradation in fiber connections

A

various imperfections in the glass media

broken cables / open connections

dirty connectors

very small mismatches in clad or core

38
Q

dispersion

A

spreading out of signal over long distances

39
Q

modal distortion

A

dispersion caused by mismatch between propagation velocities between nodes

when signals sent at the same time arrive at different times - different in wavelength of signals

40
Q

bend radius limitation

A

limit to which a fiber cable may be bent without creaking light leakage

41
Q

light leakage

A

signal leaving the cable

42
Q

fiber mismatches

A

cable technology must match switch technology

SMF connected to MMF

different signal wavelengths (1310 vs 1550)

43
Q

OTDR

A

optical time domain reflector

tool used to measure continuity & determine break location

44
Q

PCI

A

peripheral component interconnect

older, still common type of expansion slot

45
Q

PCIe

A

PCI express

new type of expansion slot - more common

1 or 2 lane varieties

46
Q

bonding (link aggregation)

A

ability to use multiple NICs for a single machine

at least doubles the speed of connection by reducing the burden on a single NIC

47
Q

LACP

A

link aggregation control protocol

controls how multiple network devices send & receive data as a single connection

48
Q

link lights

A

device is disconnected - always check link lights on NIC & switch first

multispeed devices usually have link lights that indicate speed

1-4 lights per NIC

switches - 1 light per port

solid light indicates good connection (no blinking)

many fiber NICs don’t have link lights

49
Q

activity light

A

indicates network traffic

blinking in normal operation

no activity - no connection (false connection link light)

50
Q

collision light

A

indicates there has been a collision

modern NICs don’t have these

51
Q

loopback test

A

sends data out of NIC & tests to see if it comes back

true external loopback tests require loopback plug

52
Q

why external loop back tests can be more accurate

A

some NICs only perform internal loopback tests - test internal circuitry - not connecting pins

53
Q

UPS

A

uninterruptible power supply

back up battery that plugs into the wall

54
Q

online UPS

A

continually charges a battery - powers computer components - computer up until battery is drained

55
Q

SPS

A

standby power supply

charges battery - doesn’t power computer unless power goes out

56
Q

toner

A

general term for tone generator & tone probe

57
Q

tone generator

A

connects to cable with alligator clips or network jack

sends signal along wire at a certain frequency

58
Q

tone probe

A

emits sounds when placed near a cable connected to the tone generator

CompTIA Network+ (9 decks)

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