Encapsulation And Ethernet

Question 1

What are 3 transmission methods

Answer 1

Full duplex - can concurrently transmit and receive
Half duplex - can transmit and receive in one direction at a time
Simplex - data can only travel in one direction

Question 2

What is CSMA/CD?

Answer 2

Carrier Sense Multiple Access with Collision Detect

Used to determine when a device can transmit and what happens if two devices transmit concurrently

Question 3

What is carrier sense?

Answer 3

When a device puts a carrier onto the medium when transmitting
Other devices listen for a carrier when ready to transmit
If the carrier is detected the medium is determined to be busy and the devices will wait

Question 4

Explain how a MAC address is ‘built’

Answer 4

48 bits
First 24 bits are Organizational Unique Identifier (OUI) assigned by IEEE
Second 24 bits are device identifier assigned by vendor