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Questions and Answers
What is the speed of 100-Mbps Ethernet?
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?
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?
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?
What does Gigabit Ethernet increase tenfold over Fast Ethernet?
Which LAN specification is also known as Fast Ethernet?
Which LAN specification is also known as Fast Ethernet?
What is the upcoming version of Ethernet that will operate at 10 Gbps?
What is the upcoming version of Ethernet that will operate at 10 Gbps?
What occurs when two stations transmit simultaneously on a CSMA/CD LAN?
What occurs when two stations transmit simultaneously on a CSMA/CD LAN?
What does the NIC do when a station transmits on a CSMA/CD LAN?
What does the NIC do when a station transmits on a CSMA/CD LAN?
How do CSMA/CD stations know when they must retransmit data?
How do CSMA/CD stations know when they must retransmit data?
What is the purpose of the backoff algorithm in a CSMA/CD LAN?
What is the purpose of the backoff algorithm in a CSMA/CD LAN?
How are priorities managed in CSMA/CD networks?
How are priorities managed in CSMA/CD networks?
What happens if two or more stations attempt to transmit simultaneously on a CSMA/CD LAN?
What happens if two or more stations attempt to transmit simultaneously on a CSMA/CD LAN?
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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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