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Network+ > Cabling and Topology > Flashcards

Cabling and Topology Flashcards

1
Q

Bus (Topology)

A

All computers connected in a line along one cable path

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2
Q

Ring(Topology)

A

All computers connected in a circle along one cable path

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3
Q

Data on a Bus

A

Needs termination at each end of the bus to prevent data reflection (infinite reflection would bring network down)

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4
Q

Ring data travel

A

Circular, no termination needed, goes through every computer in the same direction

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5
Q

Fault Tolerance

A

If one cable breaks, network doesn’t die completely

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6
Q

Logical vs Physical topology

A

Logical - the electronic flow
Physical - the layout of the wires

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7
Q

Hybrid Topologies

A

Shortening the ring or bus into a centralized box. Takes advantage of fault tolerance (physical topology).

The signal topology (logical topology) behaves like shrunken version in-box.

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8
Q

Mesh Topologies

A

Partially Meshed: At least two machines have redundant connections - but not every machine connects to every otyher machine

Fully Meshed: every machine connects to every machine

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9
Q

Two Main Types of Copper Cable

A

1) Twisted Pair
2) Coaxial

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10
Q

Coaxial Anatomy (center outward)

A

-Central copper wire
-Insulation
-Braided metal shield
-Jacket

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11
Q

Coax Advantages

A

Shielded from EMI

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12
Q

Coax Connector Types

A

BNC (bayonet style - push and twist)
F-type (screw on)

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13
Q

Coax Cable Types

A

RG-59 (thinner, traditionally just used for cable tv)
RG-6 (thicker, more robust, more bandwidth)

RG = Radio Guide

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14
Q

Impedance

A

Factors that contribute to the resistance to flow of electricity, measured in ohms.

RG-6 and RG-59 have 75 ohms, which is an approved network rating

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15
Q

Direct Attached Cable

A

DAC connector, twinaxial (two twisted coppers wrapped with a single shield)

Generally used for short distances (within a rack)

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16
Q

6 STP types

A

F/UTP
S/UTP
SF/UTP
S/FTP
F/FTP
U/FPT

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17
Q

F/UTP

A

Foil shields entire cable, insides wires are UTP

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18
Q

S/UTP

A

Braid screen shields entire cable, insides wires are UTP

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19
Q

SF/UTP

A

Braid screen and foil shield entire cable, insides wires are UTP

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20
Q

S/FTP

A

Braid screen shields entire cable, foil shields each wire pair

21
Q

F/FTP

A

Foil screen shields entire cable, foil shields each wire pair

22
Q

U/TFP

A

No shielding outsides, insides each pair shielded with foil screens

23
Q

Cat 5 max freq, Max bandwidth, TIA status

A

100 Mhz, 100 Mbps, No longer recognized

24
Q

Cat 6 max freq, Max bandwidth, TIA status

A

250 Mhz, 10Gbps, Recognized

10GBASE-T networks limit distance to 55 meters

25
Q

Cat 5e max freq, max bandwidth, TIA status

A

100 MHz, 1 Gbps, Recognized

26
Q

Cat 6a max freq, max bandwidth, TIA status

A

500 MHz, 10 Gbps, Recognized

27
Q

Cat 7 max Freq, Max bandwidth, TIA status

A

600 MHz, 10+ Gbps, not recognized

28
Q

Cat 8 max freq, max bandwidth, TIA status

A

2000 MHz, 40-100 Gbps, Not regognized

29
Q

Bandwidth (technically)

A

The max amount of data that goes through the cable per second - each cycle per second (Mhz) generally equates to one bit of data per second

30
Q

4 Components of Fiber Optic Cabling

A

1) Core - the glass fiber
2) Cladding - makes the light reflect down the fiber
3) Buffer - strengthening material
4) Insulating jacket - exterior sheath

31
Q

Duplex (fiber optic)

A

Cabling that is actually two fibers connected together for sending/receiving

32
Q

MMF

A

Multimode Fiber

33
Q

Multimode Fiber Definition

A

MMF

Cable that uses LEDs to transmit data down fiber (regular light)

34
Q

SMF

A

Single-mode Fiber

35
Q

Single-mode Fiber Definition

A

Fiber optic cabling that uses laser light to transmit

36
Q

Modal Distortion

A

MMF problem when signals sent at the same time don’t arrive at the same time

SMF doesn’t have this issue

37
Q

MMF Wavelengths

A

850 nm
1300 nm

38
Q

SMF Wavelngths

A

1310 nm
1550 nm

39
Q

Fiber Connectors

A

ST - straight tip (snap and twist)
SC - square (stick and click)
LC - duplex longo (little connector)
MT-RJ - no tip!

40
Q

Star topology (aka _____)

A

Aka hub and spoke

Utilizes central box for all computers on network

Introduced fault tolerance for network

Not super popular because it required a redesign of network hardware

41
Q

What is a network technology?

A

A practical application of a topology and other critical tools that provides a method to get data from one computer to another on a network.

E.g. 100BASE-T

42
Q

Crosstalk

A

Interference that the twists in twisted pair cabling help reduce.

More twists per foot - less crosstalk.

43
Q

Cat ratings are measured in ___

A

MHz - indicates the highest possible frequency

44
Q

Location of Cat ratings?

A

1) On the box
2) On the cable

45
Q

RJ-11 connector (describe)

A

Typically for phones, uses 2 UTP wires

46
Q

RJ-45 connector (Describe)

A

Four pairs of UTP wires

8 position 8 contact (8P8C)

47
Q

Common fiber optic cable sizes

A

9/125 micrometers
50/125 micrometers
62.5/125 micrometers

48
Q
A

Network+ (7 decks)

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