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CSMA/CD LAN Protocol

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Questions and Answers

What is the speed of 100-Mbps Ethernet?

1000 Mbps

1 Gbps

100 Mbps (correct)

10 Mbps

Which IEEE standard defines Gigabit Ethernet operations over fiber optics?

IEEE 802.3

IEEE 802.3ab

IEEE 802.3z (correct)

IEEE 802.3u

What is the primary distinguishing feature of Fast Ethernet over 10-Mbps Ethernet?

Advanced networking software

Different cable structure

Increased speed (correct)

Protocol translation requirement

What does Gigabit Ethernet increase tenfold over Fast Ethernet?

Data rate Signup and view all the answers

Which LAN specification is also known as Fast Ethernet?

IEEE 802.3u Signup and view all the answers

What is the upcoming version of Ethernet that will operate at 10 Gbps?

10-Mbps Ethernet Signup and view all the answers

What occurs when two stations transmit simultaneously on a CSMA/CD LAN?

Both transmissions are damaged, leading to a collision. Signup and view all the answers

What does the NIC do when a station transmits on a CSMA/CD LAN?

Senses the carrier and refrains from broadcasting. Signup and view all the answers

How do CSMA/CD stations know when they must retransmit data?

They detect collisions during transmission. Signup and view all the answers

What is the purpose of the backoff algorithm in a CSMA/CD LAN?

To schedule retransmission after a collision. Signup and view all the answers

How are priorities managed in CSMA/CD networks?

No priorities are assigned; all stations have equal access. Signup and view all the answers

What happens if two or more stations attempt to transmit simultaneously on a CSMA/CD LAN?

A collision occurs, and a backoff algorithm schedules retransmission. Signup and view all the answers

Study Notes

Ethernet Protocols

There are four common protocols related to Ethernet: 10-Mbps, 100-Mbps, Gigabit, and 10000-Mbps Ethernet.

10-Mbps Ethernet

Operates at 10 megabits per second (Mbps) over coaxial or twisted-pair cable.
Meets LAN specifications (IEEE 802.3 and Ethernet II).

100-Mbps Ethernet (Fast Ethernet)

Operates at 100 Mbps over twisted-pair cable.
Meets LAN specification (IEEE 802.3u).
Increases speed tenfold over 10-Mbps Ethernet.

Gigabit Ethernet

Operates at 1000 Mbps, or 1 gigabit per second (Gbps).
Meets IEEE 802.3 standards, including IEEE 802.3z (fiber optics) and IEEE 802.3ab (twisted-pair cable).
Increases speed tenfold over Fast Ethernet.

10000-Mbps (10-Gbps) Ethernet

Soon to be implemented.

CSMA/CD Protocol

Stations on a CSMA/CD LAN can access the network at any time.
Before sending data, stations listen to the network to determine whether it is already in use.
If two stations transmit simultaneously, a collision occurs, and the stations must retransmit.
The CSMA/CD process involves carrier sense, multiple access, and collision detection.
Collisions are normally resolved in microseconds.

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Description

Learn about the CSMA/CD LAN protocol where stations can access the network at any time, listen before sending data, and handle collisions by retransmitting at a later time. Understand how this protocol helps manage network traffic efficiently.