Cabling and Topology

Question 1

Network Topology?

Answer 1

The way that cables and hardware connect to each another

Question 2

Bus Topology?

Answer 2

single cable connects all computers in a line

Question 3

Ring Topology?

Answer 3

connects all computers with a ring

Question 4

How was data sent in a bus topology?

Answer 4

• out on the entire bus

- terminations needed to stop signal from reflecting

Question 5

How was data sent in a ring topology?

Answer 5

• moved in a circle from one computer to the next
• no terminations were needed
• break in the cable stops data flow

Question 6

How is data sent on a star topology?

Answer 6

• used a central box

- offered fault tolerance, if cable broke, the rest of the computers could still communicate

Question 7

Physical topology?

Answer 7

How the cables look

Question 8

Signaling Topology

Answer 8

how the signals travel electronically

also called logical topology

Question 9

Hybrid topology

Answer 9

any topology that combies physical and logical

Question 10

What topology is used today?

Answer 10

Star bus

Question 11

Mesh topology?

Answer 11

Every computer connects to every other computer via two or more routes

Question 12

partially meshed topology?

Answer 12

at least 2 machines have redundant connections

Question 13

Coaxial cable

Answer 13

• central conductor wire (usually copper) surounded by an insulating material, which is sorrounded by a braided metal shield
• the center wire and metal shield share a common axis
• shields data transmissions from interference

Question 14

EMI

Answer 14

Electromagnetic interference
- other devices generate magenetic fields (lights, fans, copy machiens, refridgerators), and these fields cause current when they cross an electrical wire

Question 15

Early coaxial connections

Answer 15

BNC

Question 16

Coax used for cable television

Answer 16

RG-59
75 Ohms
F-Type

Question 17

Coax used for internet

Answer 17

RG-6
75 Ohms
F-Type
always thicker than RG-59

Question 18

Coax rating

Answer 18

RG (radio guide) rating

Question 19

Coax used for networking

Answer 19

RG-58
50 ohms
BNC

Question 20

reduce crosstalk

Answer 20

use twisted pairs of wires

the more twists per foot, the less crosstalk

Question 21

STP

Answer 21

Shielded Twisted Pair

- twisted wire pairs surrounded by shielding to protect from EMI

Question 22

UTP

Answer 22

Unshielded Twisted Pair

• twisted wire pairs surrounded by a plastic jacket
• no protection from EMI

Question 23

Cat ratings are in

Answer 23

MHz, the highest frequency a cable can handle

Question 24

Cat 3

Answer 24

16 MHz

16 Mbps

Question 25

Cat 5

Answer 25

100 MHz | 100 Mbps

Question 26

Cat 5e

Answer 26

100 MHz | 1 Gbps

Question 27

Cat 6

Answer 27

250 MHz | 10 Gbps

Question 28

Cat 6a

Answer 28

500 MHz | 10 Gbps

Question 29

Cat 7

Answer 29

600 MHz | 10+ Gbps

Question 30

Telephone wires

Answer 30

RJ-11, supports up to two pairs of UTP

Question 31

Fiber optic cable

Answer 31

- Core (glass fiber) - Cladding (relective part) - Buffer (give strength) - Insulating Jacket

Question 32

How are fiber optic cables sized?

Answer 32

Core and cladding measurements

Question 33

MMF

Answer 33

Multimode Fiber - uses LEDs for light - 850nm wavelength

Question 34

SMF

Answer 34

Single-mode Fiber - uses lasers for light - prevents modal distortion - 1310 or 1550 nm wavelength

Question 35

Fiber connections

Answer 35

ST (stick/twist) SC (stick/click) LC (little connector) , duplex MT-RJ, duplex

Question 36

DB-9

Answer 36

9-pin serial port | 56,000 bps

Question 37

DB-25

Answer 37

25 pin parralel port | 2 Mbps

Question 38

Which topolgy is most commonly used today in wireless devices?

Answer 38

Mesh