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Flashcards in Chapter 3 - Network Media & Topologies Deck (25)
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1

what's the difference between multimode and singlemode fiber?

cladding - what is it?

3-91

MMF - high speed, medium distance (up to 3,000 ft), completely immune to electrical interference, will be made of glass OR plastic

SMF - high speed, high distance (50X farther than MMF), made of glass

special material that lines the core of MMF

2

which cable type is more prevelent in networks, fiber optic or copper?

what's the most common type of cable in use today?

how is STP shielded?

3-91

copper

unshielded twisted pair

foil shield that covers the wires against magnetic interference

3

you have CAT cables. tell me the 5 different categories and their maximum speeds.

which one of these is the minimum for all new installation?

these cables are all what?

3-93

3 - 10 Mbps
5 - 100 Mbps
5e - 1000 Mbps
6 - 1000 Mbps
6a - 1000 Mbps

Cat5e

unshielded twisted pair

4

state the 2 types of coax cable. which one offers less resistance, better performance, and why is it able to accomplish this?

strait-through vs crossover: which do you use between PC and a router?

3-94,95

RG-59
RG-6

RG-6, because of thicker core

crossover

5

how would you connect a router to a digital circuit such as a T1 or T3 line?

how would you connect a CSU/DSU to another CSU/DSU?

is the most common type of cable in a network a straight-through or crossover? what is that cable also known as?

3-95

use a CSU/DSU channel service unit/data service unit

use a T1 crossover cable

straight-through

patch cable

6

single mode, multimode fiber, inside building, outside building. which cable goes where?

3-96,97

inside - multimode
outside - single mode

7

fiber optic connector types.
tell me full name a description

ST
SC
LC
MTRJ

3-99,100




straight tip - half twist bayonet
standard connector - push/pull
local connector - fiber connector, RJ style
mechanical transfer registered jack - designed to replace the SC connector

8

copper connector types. full name and description?

RJ45
RJ11
BNC
F
DB9 - RS232

3-101,102,103



most common of the network connectors
used for telephone connections
push in and twist to lock
common coax connector type
9 pins, or 9 holes

9

what's a patch panel?
what's a 110 block?
show me the difference between 568A, 568B, and 568A+568B

3-104

rack or wall-mounted structure that houses cable connections

replacement for telephone wire installations straight-through

straight-through
TX+ 1----1 RX+
TX- 2----2 RX-
RX+ 3----3 TX+
RX- 6----6 TX-

crossover is similar, but 1 and 2 go to 3 and 6

10

802.11 chart.

tell me the letter, method, freq, and speed

now tell me the general ranges

3-106


a - OFDM, 5 GHz, 54 Mbps
b - DSSS, 2.4 GHz, 11 Mbps
g - both, 2.4 GHz, 54 Mbps
n - both, both, 600 Mbps

a,b,g - 30 meters. n - 90 meters

11

which 2 wireless standards allow for channel bonding?

3-107

g and n

NOT a and b

12

big table of WANs, tell me their speeds

T1
T3
ADSL
SDSL
VDSL
Cable
Satellite

3-108 ~ 117



1.54 Mbps
44.736 Mbps
10 Mbps
1.5 Mbps
100 Mbps
10 Mbps
10 Mbps

13

continuing the big table of WANs, tell me their speeds

OC-X (3 kinds)
wireless
ATM
SONET
ISDN
Dial-up

3-108~117



50 Mbps, 150 Mbps, 160 Gbps
it varies
500 Mbps
150 Gbps
128 kbps
56 kbps

14

what's the difference between circuit switch and packet switch?

3-116,117

circuit switch - used dial up lines and a circuit switched network

packet switch - X.25, Frame Relay is an example

15

what is MPLS?

point to multipoint connections cannot use ____ ____ because the connections are ____.

therefore, ____ controls the traffic.

3-118

multiprotocol label switching, uses labels to make forwarding decisions instead of relying on specific protocols

full-duplex communications, shared

CSMA/CD

16

show me the difference between a ring and a star topology

3-120

draw them out

17

mesh topology:

what's the formula for the number of connections?

show me a 4 computer full mesh diagram

3-121

[n(n-1)]/2

n = # of computers

draw the mesh

18

which 2 types of connectors would you commonly see in a BUS topology?

3-121

BNC, T

19

short circuit is also called what?
T/F: ethernet cable should cross power cable at 90 degrees
EMI = ?
what is attenuation?
max length of UTP/STP?

3-124

an open short
true
electromagnetic interference
degradation of signal from medium
100 meters (328 feet)

20

LAN technology types. given the type, tell me
the media, the speed, and the distance

ethernet
10BaseT
100BaseT
100BaseTX
100BaseFX
1000BaseT
1000BaseX

3-127

coax, TP 10 Mbps 100 meters
TP 10 Mbps 100 meters
TP 100 Mbps 100 meters
TP 100 Mbps 100 meters
multimode fiber 100 Mbps 400 meters
TP 1 Gbps 100 meters
singlemode fiber 1 Gbps 1 Gbps on fiber

21

LAN technology types. given the type, tell me
the media, the speed, and the distance

10GBaseSR
10GBaseLR
10GBaseER
10GBaseSW
10GBaseLW
10GBaseEW
10GBaseT

3-127

multimode 10 Gbps 26-82 meters
singlemode 10 Gbps 25 km / 16 mi
singlemode 10 Gbps 40 km / 25 mi
multimode 10 Gbps 26-82 meters
singlemode 10 Gbps 25 km
singlemode 10 Gbps 40 km
TP 10 Gbps 100 meters

22

what is CSMA/CD?

what is its main disadvantage?

3-128

carrier sense multiple access w/ collision detection

doesn't work well for large networks

23

what is CSMA/CA?

3-128

carrier sense multiple access w/ collision avoidance

24

tell me the 3 types of communication on IPv4

what is a collision?

3-128

unicast
multicast
broadcast

when 2 electrical signals cancel each other out

25

explain the basic concept of bonding

3-129

combine 2 physical interfaces into one logical interface for the purpose of bandwidth allocation