Tansmission Methods

Question 0

Full duplex

Answer 0

Uses two pairs of wires. Restriction is having only two nodes on the wire (i.e host connected directly to a switch port). Collisions will not occur.

Question 1

Half duplex

Answer 1

Uses one pair of wires. Host cannot transmit and receive simultaneously.

Question 2

Auto negotiation

Answer 2

Uses a series of fast Links Pulses (FLPs) to communicate with the device on the other end to determine speed and duplex.

Question 3

Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

Answer 3

Created to overcome the problem of collisions that occur when packets are transmitted simultaneously from differently nodes on the network medium.

• used in half duplex Ethernet networks.
• half-duplex uses single pair for both transmit and receive.
• if a collision occurs, the transmitting host sends an extended jam signal, which tells all hosts to stop transmitting.
• The transmitting host then waits random back off time prior to retransmission.