Ccna routing and Switching Complete Study Guide

1.

  A jam signal informs all devices that a collision occurred.

2.

  The collision invokes a random backoff algorithm.

3.

  Each device on the Ethernet segment stops transmitting for a short time until its 

backoff timer expires.

4.

  All hosts have equal priority to transmit after the timers have expired.

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Ethernet Networks in Review 

47

The ugly effects of having a CSMA/CD network sustain heavy collisions are delay, low 

throughput, and congestion.

Backoff on an Ethernet network is the retransmission delay that’s 

enforced when a collision occurs. When that happens, a host will resume 

transmission only after the forced time delay has expired. Keep in mind 

that after the backoff has elapsed, all stations have equal priority to 

transmit data.

At this point, let’s take a minute to talk about Ethernet in detail at both the Data Link 

layer (layer 2) and the Physical layer (layer 1).