Ethernet Basics

Question 1

IEEE

Answer 1

Institute of Electrical and Electronics Engineers

Question 2

5 things ethernet frame contains

Answer 2

1. Destination
2. Source
3. Type
4. Data
5. Frame Check Sequence

Question 3

Preamble

Answer 3

Gives the receiving NIC time to realize a frame is incoming and to know exactly where the frame starts. Added by sending NIC.

Question 4

10BaseT Network

Answer 4

2 or more computers connected to a central hub. 10Mbps speed, Baseband, Twisted pair cabling. Required Cat3 cabling.

Question 5

10BaseT Pins Used

Answer 5

Pins 1 and 2 to send Data
Pins 3 and 6 to receive data
Cant send and receive simultaneously

Question 6

Pairs of Twisted Wire

Answer 6

Blue/Blue White
Orange/Orange White
Brown/Brown White
and Green/Green white

Question 7

TIA/EIA 568A and 568B

Answer 7

Industry Standard for correct crimping

Question 8

TIA/EIA 568A pin order

Answer 8

1. Green/White
2. Green
3. Orange/White
4. Blue
5. Blue/White
6. Orange
7. Brown/white
8. Brown

Question 9

TIA/EIA 568B pin order

Answer 9

1. Orange/White
2. Orange
3. Green/white
4. Blue
5. Blue/White
6. Green
7. Brown/White
8. Brown

Question 10

10BaseT summary

Answer 10

Speed: 10Mbps
Signal Type: Baseband
Distance: 100 meters between the hub and the node
Node Limit: No more than 1024 nodes per hub
Topology: Star-Bus topology; physical star, logical bus
Cable type: cat3 or better utp cabling with rj-45

Question 11

10BaseFL Summary

Answer 11

Speed: 10Mbps
Signal type: Baseband
Distance: 2000 Meters between the hub and node
Node Limit: No more than 1024 nodes per hub
Topology Star-bus; physical star; logical bus
Cable type: MMF with ST or SC connectors

Question 12

CSMA/CD

Answer 12

carrier sense multiple access/collision detection; used to determine which computer should us a shared cable at a given moment

Question 13

SAT

Answer 13

Source address table that switches use to store Mac Addresses

Question 14

Uplink Ports

Answer 14

Enable you to connect two switches using a straight through cable. Modern switches do not require uplink ports because any port can work as uplink.

Question 15

Crossover Cable

Answer 15

Reverses the sending and receiving pairs on one end of the cable so you can plug in 2 switches together .

Question 16

STP

Answer 16

Spanning Tree Protocol which stops accidental bridging loops

Question 17

BPDUs

Answer 17

Bridge Protocol Data Units are special STP frames that switches use to communicate with other switches to prevent loops from happening.

Question 18

TCN

Answer 18

Topology Change Notification which allows the switches to rework themselves around a failed device.

Question 19

RSTP

Answer 19

Rapid spanning tree protocol Significantly faster convergence time following some kind of network change.