Class 2 - Ethernet Networking And Data Encapsulation

Question 1

What is CSMA/CD

Answer 1

Carrier Sense Multiple Access with Collision Detection

-2 machines try to send data at the same time

-One or both detect the collision, send a jam signal

-Both nodes will back off and wait a random amount of time before transmitting again

Question 2

What is the maximum speed of each of the following cables?

Cat 3
Cat 5
Cat 5e
Cat 6

Answer 2

-Cat 3 - Normally used for telephone - 10Mbps

-Cat 5 - 100Mbps

Cat 5e - 1Gbps

•Cat 6 - 10Gbps

Question 3

What is a straight-through ethernet cable used to connect?

Answer 3

-Host to switch/hub

-Router to switch/hub

Question 4

What is a cross-over ethernet cable used for?

Answer 4

• switch to switch
• host to host

-router to router

Question 5

In what scenario would you use a rolled ethernet cable?

Answer 5

Only used for Cisco serial ports - never for Ethernet!