Week2

Which one is not the MAC address?

• 76-65-G8-45-92-A2

• 76-02-CA-B5-1D-A2

• AC:89:76:C2:32:B4

• B4F63E8AD692

What is not the correct description for MAC address?

• Most commonly 48 bits long.

• d

• A routable address.

• d

• d

Under CSMA/CD, the sender will _ after a collision is detected.

Under CSMA/CD, the sender will _ before the transmission.

What is the best description for error detection in data link layer?

• Receiving interface examines the received frame for possible bit errors.

• Receiving interfaces use additional data the sending interface adds to reconstruct the original frame without errors.

• Receiving inerfaces use special code to match errors.

The data link layer may provide Local addressing, Media access control, Error detection/correction, Local flow control, acknowledgements and error recovery.

• True

• False

The time it takes for the transmission to propagate to the receiver. Depends on the distance between the sending and receiving interfaces and the speed of light in the medium.

• Transmission time

• Propagration time

• Transport time

• Round-time

Fibre link from Melbourne to Auckland:

- 3000 Mb/s data rate

- 1600 km cable

- Speed of light in cable: 200, 000 km/s

- Frame size: 24, 000 bits

The transmission time is ___.

Fibre link from Melbourne to Auckland:

- 3000 Mb/s data rate

- 1600 km cable

- Speed of light in cable: 200, 000 km/s

- Frame size: 24, 000 bits

The propagation time is ___.

IP address is the identification of a device in data link layer

• False

• True