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A remote collision, in CSMA/CD computer networks over half-duplex media (10BASE5 or 10BASE2), is a collision that occurs when a frame shorter than the minimum length is transmitted. This frame may cause a collision at the remote end which cannot be detected by the transmitter, so the frame is not resent on the physical layer.
CSMA/CD is used to improve CSMA performance by terminating transmission as soon as a collision is detected, thus shortening the time required before a retry can be attempted. CSMA/CD is used by Ethernet. Carrier-sense multiple access with collision avoidance In CSMA/CA collision avoidance is used to improve the performance of CSMA.
The most widespread multiple access method is the contention-based CSMA/CD used in Ethernet networks. This mechanism is only utilized within a network collision domain, for example, an Ethernet bus network or a hub-based star topology network. An Ethernet network may be divided into several collision domains, interconnected by bridges and switches.
Carrier-sense multiple access with collision avoidance (CSMA/CA) in computer networking, is a network multiple access method in which carrier sensing is used, but nodes attempt to avoid collisions by beginning transmission only after the channel is sensed to be "idle". [1] [2] When they do transmit, nodes transmit their packet data in its entirety.
CSMA/CD is a protocol used in Ethernet networks to regulate access to the network medium. Before transmitting data, a device using CSMA/CD first listens to the network to check if it is idle. If the network is busy, the device waits for a random amount of time before attempting to transmit again.
Common statistical time-division multiplexing multiple access protocols for wired multi-drop networks include: Carrier-sense multiple access with collision detection (CSMA/CD), used in Ethernet and IEEE 802.3; Multiple Access with Collision Avoidance (MACA) Multiple Access with Collision Avoidance for Wireless (MACAW) Carrier-sense multiple ...
In contention, any computer in the network can transmit data at any time (first come-first served). This system breaks down when two computers attempt to transmit at the same time. This is known as a collision. To avoid collisions, a carrier sensing mechanism is used. Here each computer listens to the network before attempting to transmit.
On Ethernet using shared media, collisions are resolved using carrier-sense multiple access with collision detection (CSMA/CD) in which the competing packets are discarded and re-sent one at a time. This becomes a source of inefficiency in the network. [1]