In an Ethernet LAN, how does the NIC know when it can transmit data?A. An Ethernet NIC transmits data as soon as the frame is received.B. An Ethernet NIC transmits data as soon as the NIC receives a tokenC. An Ethernet NIC transmits data when it senses a collisionD. An Ethernet NIC transmits data after listening for the absence of a signal on themedia
Question
In an Ethernet LAN, how does the NIC know when it can transmit data?A. An Ethernet NIC transmits data as soon as the frame is received.B. An Ethernet NIC transmits data as soon as the NIC receives a tokenC. An Ethernet NIC transmits data when it senses a collisionD. An Ethernet NIC transmits data after listening for the absence of a signal on themedia
Solution
D. An Ethernet NIC transmits data after listening for the absence of a signal on the media.
This is known as Carrier Sense Multiple Access with Collision Detection (CSMA/CD). The Network Interface Card (NIC) in an Ethernet LAN listens to the network media before transmitting data. If the media is busy (i.e., a signal is present), the NIC waits and tries again after a random backoff period. If the media is free (i.e., no signal is present), the NIC begins transmitting data. If a collision occurs (i.e., two devices transmit at the same time), the NIC detects this, stops transmitting, and tries again after a random backoff period.
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