In which scenario would a device utilize CSMA/CD?

In which scenario would a device utilize CSMA/CD?

• A. When communicating over fiber optic connections
• B. When operating over legacy shared half-duplex media
• C. When using full-duplex Ethernet connections
• D. When connecting to a wireless LAN

Answer: (B)

CSMA/CD, which stands for Carrier Sense Multiple Access with Collision Detection, is primarily used in Ethernet networks, particularly those operating in a half-duplex mode. In a half-duplex setting, devices share the same medium for communication and can either send or receive data, but not both at the same time. When multiple devices attempt to transmit data simultaneously, collisions can occur. CSMA/CD helps to manage these collisions by ensuring that devices listen for a carrier signal before transmitting and allowing them to detect and resolve any collisions that happen during data transmission. The scenario involving legacy shared half-duplex media is where CSMA/CD is essential, as it directly addresses the challenges posed by multiple devices sharing the same communication channel in a non-full-duplex environment. If a collision is detected, the devices involved wait for a random period before attempting to retransmit, reducing the chance of repeating the collision immediately. In contrast, fiber optic connections, full-duplex Ethernet connections, and wireless LAN connections do not utilize CSMA/CD in the same way. Fiber optic connections typically operate under different protocols as they have the advantage of higher bandwidth and distance without the collision issues encountered in older cabling. Full-duplex Ethernet allows devices to send and receive data simultaneously, effectively eliminating the

CSMA/CD, which stands for Carrier Sense Multiple Access with Collision Detection, is primarily used in Ethernet networks, particularly those operating in a half-duplex mode. In a half-duplex setting, devices share the same medium for communication and can either send or receive data, but not both at the same time. When multiple devices attempt to transmit data simultaneously, collisions can occur. CSMA/CD helps to manage these collisions by ensuring that devices listen for a carrier signal before transmitting and allowing them to detect and resolve any collisions that happen during data transmission.

The scenario involving legacy shared half-duplex media is where CSMA/CD is essential, as it directly addresses the challenges posed by multiple devices sharing the same communication channel in a non-full-duplex environment. If a collision is detected, the devices involved wait for a random period before attempting to retransmit, reducing the chance of repeating the collision immediately.

In contrast, fiber optic connections, full-duplex Ethernet connections, and wireless LAN connections do not utilize CSMA/CD in the same way. Fiber optic connections typically operate under different protocols as they have the advantage of higher bandwidth and distance without the collision issues encountered in older cabling. Full-duplex Ethernet allows devices to send and receive data simultaneously, effectively eliminating the