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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Exam Essentials

Describe the operation of Carrier Sense Multiple Access with Collision Detection (CSMA/CD). CSMA/CD is a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium. Although it does not eliminate collisions, it helps to greatly reduce them, which reduces retransmissions, resulting in a more efficient transmission of data for all devices.

Differentiate half-duplex and full-duplex communication and define the requirements to utilize each method. Full-duplex Ethernet uses two pairs of wires instead of one wire pair like half duplex. Full duplex allows for sending and receiving at the same time, using different wires to eliminate collisions, while half duplex ...

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