Cabling and Topology

Question 1

Bus (Topology)

Answer 1

All computers connected in a line along one cable path

Question 2

Ring(Topology)

Answer 2

All computers connected in a circle along one cable path

Question 3

Data on a Bus

Answer 3

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

Question 4

Ring data travel

Answer 4

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

Question 5

Fault Tolerance

Answer 5

If one cable breaks, network doesn’t die completely

Question 6

Logical vs Physical topology

Answer 6

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

Question 7

Hybrid Topologies

Answer 7

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.

Question 8

Mesh Topologies

Answer 8

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

Question 9

Two Main Types of Copper Cable

Answer 9

1) Twisted Pair
2) Coaxial

Question 10

Coaxial Anatomy (center outward)

Answer 10

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

Question 11

Coax Advantages

Answer 11

Shielded from EMI

Question 12

Coax Connector Types

Answer 12

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

Question 13

Coax Cable Types

Answer 13

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

RG = Radio Guide

Question 14

Impedance

Answer 14

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

Question 15

Direct Attached Cable

Answer 15

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

Generally used for short distances (within a rack)

Question 16

6 STP types

Answer 16

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

Question 17

F/UTP

Answer 17

Foil shields entire cable, insides wires are UTP

Question 18

S/UTP

Answer 18

Braid screen shields entire cable, insides wires are UTP

Question 19

SF/UTP

Answer 19

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

Question 20

S/FTP

Answer 20

Braid screen shields entire cable, foil shields each wire pair

Question 21

F/FTP

Answer 21

Foil screen shields entire cable, foil shields each wire pair

Question 22

U/TFP

Answer 22

No shielding outsides, insides each pair shielded with foil screens

Question 23

Cat 5 max freq, Max bandwidth, TIA status

Answer 23

100 Mhz, 100 Mbps, No longer recognized

Question 24

Cat 6 max freq, Max bandwidth, TIA status

Answer 24

250 Mhz, 10Gbps, Recognized

10GBASE-T networks limit distance to 55 meters

Question 25

Cat 5e max freq, max bandwidth, TIA status

Answer 25

100 MHz, 1 Gbps, Recognized

Question 26

Cat 6a max freq, max bandwidth, TIA status

Answer 26

500 MHz, 10 Gbps, Recognized

Question 27

Cat 7 max Freq, Max bandwidth, TIA status

Answer 27

600 MHz, 10+ Gbps, not recognized

Question 28

Cat 8 max freq, max bandwidth, TIA status

Answer 28

2000 MHz, 40-100 Gbps, Not regognized

Question 29

Bandwidth (technically)

Answer 29

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

Question 30

4 Components of Fiber Optic Cabling

Answer 30

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

Question 31

Duplex (fiber optic)

Answer 31

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

Question 32

MMF

Answer 32

Multimode Fiber

Question 33

Multimode Fiber Definition

Answer 33

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

Question 34

SMF

Answer 34

Single-mode Fiber

Question 35

Single-mode Fiber Definition

Answer 35

Fiber optic cabling that uses laser light to transmit

Question 36

Modal Distortion

Answer 36

MMF problem when signals sent at the same time don't arrive at the same time SMF doesn't have this issue

Question 37

MMF Wavelengths

Answer 37

850 nm 1300 nm

Question 38

SMF Wavelngths

Answer 38

1310 nm 1550 nm

Question 39

Fiber Connectors

Answer 39

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

Question 40

Star topology (aka _____)

Answer 40

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

Question 41

What is a network technology?

Answer 41

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

Question 42

Crosstalk

Answer 42

Interference that the twists in twisted pair cabling help reduce. More twists per foot - less crosstalk.

Question 43

Cat ratings are measured in ___

Answer 43

MHz - indicates the highest possible frequency

Question 44

Location of Cat ratings?

Answer 44

1) On the box 2) On the cable

Question 45

RJ-11 connector (describe)

Answer 45

Typically for phones, uses 2 UTP wires

Question 46

RJ-45 connector (Describe)

Answer 46

Four pairs of UTP wires 8 position 8 contact (8P8C)

Question 47

Common fiber optic cable sizes

Answer 47

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