Half duplex
Half duplex is a communication mode in which data can travel in both directions, but transmission and reception cannot occur simultaneously.
Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
Half duplex is a communication mode in which an interface cannot transmit and receive simultaneously and must wait for the medium to become available.
- How it is used
- Explains how interfaces share transmission media and why duplex settings affect network performance and troubleshooting.
- How deep it goes
- Defines transmission behavior, compares Wi-Fi, hubs, and switches, then covers collisions, mismatch symptoms, autonegotiation, and Cisco configuration.
- Examples
- Uses Wi-Fi, Ethernet hubs, Cisco interface output, collision scenarios, and duplex-mismatch symptoms as practical examples.
- What you can do after
- Diagnose duplex problems with interface counters and configure duplex settings with Cisco IOS commands.
Read how Acing the CCNA Exam: Volume 1 Fundamentals and Protocols explains half duplex →
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
Half-duplex is a communication mode in which transmission can occur in both directions but only one device transmits at a time.
- How it is used
- Explains why wireless LAN devices share airtime and cannot transmit simultaneously.
- How deep it goes
- Defines one-at-a-time transmission and explains CSMA/CA, collisions, and retransmission through a simplified process.
- Examples
- Uses wireless devices, an Ethernet hub analogy, and the CSMA/CA listen-before-transmit sequence.
- What you can do after
- Evaluate wireless performance and explain airtime contention, collisions, and retransmissions.
Read how Acing the CCNA Exam: Volume 2 Advanced Networking and Security explains half duplex →
Related concepts
- networkused by · A network is a system of connected entities and links that enables communication or represents relationships among those entities.
- csma/cdused by · CSMA/CD is a shared-medium access method in which devices sense the channel, transmit when it is idle, and detect collisions during transmission.
- full duplexcontrasts with · Full duplex is a communication mode in which both endpoints can transmit and receive independently and simultaneously.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.