Ethernet: A Fundamental Networking Technology

Key Concepts of Ethernet

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What is true about Ethernet? (Choose two.)



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A. B. C. D. E.


Ethernet is a networking technology that is widely used for local area networks (LANs) and wide area networks (WANs). It defines the physical and data-link layer specifications for communication over a network. Here are the correct options:

B. 802.3 Protocol: Ethernet is based on the IEEE 802.3 standard, which defines the physical and data-link layer specifications for Ethernet networks. The 802.3 standard specifies the frame format, addressing, and media access control for Ethernet.

C. 10BaseT half duplex: 10BaseT is a type of Ethernet that operates at 10 Mbps over twisted-pair copper cables. It uses a half-duplex communication mode, which means that data can only be transmitted in one direction at a time. This is different from full-duplex communication, where data can be transmitted in both directions simultaneously.

D. CSMA/CD stops transmitting when congestion occurs: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) is a media access control method used by Ethernet to avoid collisions when multiple devices try to transmit data simultaneously. CSMA/CD detects collisions and retransmits the data after a random backoff period. When congestion occurs, CSMA/CD stops transmitting data and waits for a random period before retrying.

Option E, CSMA/CA, is not correct because CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is a media access control method used by wireless networks, not Ethernet.

Option A, 802.2 Protocol, is not correct because 802.2 is a different standard that defines the Logical Link Control (LLC) sublayer of the data-link layer for certain LAN technologies, such as Token Ring and FDDI. It is not related to Ethernet.

In summary, the two correct options are B (802.3 Protocol) and D (CSMA/CD stops transmitting when congestion occurs).