Day 2 - Interfaces and Cables

Question 1

Ethernet

Answer 1

A collection of network protocols/standards

Question 2

Why are protocols/standards needed?

Answer 2

They create agreed upon standards in the industry so devices can communicate

Question 3

What is a bit?

Answer 3

A binary value represented by either a one or a zero
The computer interprets bits to carry out tasks

Question 4

How is speed measured in networks?

Answer 4

In bits per second (not bytes)

Question 5

1 Kilobit

Answer 5

Kb
1000 bits

Question 6

1 Megabit

Answer 6

Mb
1,000,000 bits

Question 7

1 Gigabit

Answer 7

Gb
1,000,000,000 bits

Question 8

1 Terrabit

Answer 8

Tb
1,000,000,000,000 bits

Question 9

Networking standards are defined by whom?

Answer 9

The IEEE
Institute of Electrical and Electronics Engineers

Question 10

802.3i

Answer 10

Ethernet
10 Mbps
10BASE-T
100 m length
uses only 4 wires

Question 11

802.3u

Answer 11

Fast Ethernet
100 Mbps
100BASE-T
100 m length
uses only 4 wires

Question 12

802.3ab

Answer 12

Gigabit Ethernet
1 Gbps
1000BASE-T
100 m length

Question 13

802.3an

Answer 13

10 Gig Ethernet
10 Gbps
10GBASE-T
100 m length

Question 14

UTP

Answer 14

Unshielded Twisted Pair
Type of copper cable used for Ethernet cabling
Unshielded - twisted pairs within have no metallic shielding, thus vulnerable to electrical interferance
Twisted Pair - 4 pairs of twisted cables (helps reduce EMI between them)
Range of about 100 m
Emits a faint signal outside of the cable

Question 15

10/100BASE-T pin arrangements

Answer 15

Pins 1 and 2 transmit data to the switch
Pints 3 and 6 receive data from the switch
Allows for full-duplex transmission

Question 16

straight-through cable

Answer 16

UTP cable in which pins on one end match the other end

Question 17

crossover cable

Answer 17

Pin arrangement so devices using the same pins to transmit/receive data can transmit/receive data (e.g. - pin 1 to 3 and pin 2 to six
Receive pins are connected to transmit pins and vice versa

Question 18

Transmit pins?

Answer 18

Router - 1 and 2
Firewall - 1 and 2
PC - 1 and 2
Switch - 3 and 6

Question 19

Receive pins?

Answer 19

Router - 3 and 6
Firewall - 3 and 6
PC - 3 and 6
Switch - 1 and 2

Question 20

Auto MDI-X

Answer 20

Feature on newer network devices
Device automatically detects transmit/receive pins of connecting device and adjusts accordingly

Question 21

pin arrangements for 1000/10GBASE-T

Answer 21

1 and 2
3 and 6
4 and 5
7 and 8
*each pair is bi-directional

Question 22

Fiber optic structure and connection arrangment

Answer 22

1. Fiberglass core transmitting light
2. Cladding; reflects light to prevent signal loss
3. Proctective buffer; protects glass from breakage
4. Outer cable jacket

Question 23

Multimode fiber

Answer 23

Larger core and smaller cladding
Longer range than UTP but shorter than single mode
Cheaper than single mode fiber (cheaper transmitters like LED)

Question 24

Single mode fiber

Answer 24

Larger cladding and smaller core
Longest range of the tramission mediums
More expensive (laser-based transmitters)
Light enters at a single angle

Question 25

802.3z

Answer 25

1000BASE-LX
1 Gbps
Single mode (5 km)
Multi mode (550 m)

Question 26

10GBASE-SR

Answer 26

802.3ae
10 Gbps
Multimode (400 m)

Question 27

10GBASE-LR

Answer 27

802.3ae
10 Gbps
Singlemode (10 km)

Question 28

10GBASE-ER

Answer 28

802.3ae
10 Gbps
Singlemode (30 km)