Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.)

Question

Options

• AThere are no collisions in full-duplex mode.
• BA dedicated switch port is required for each full-duplex node.
• CEthernet hub ports are preconfigured for full-duplex mode.
• DIn a full-duplex environment, the host network card must check for the availability of the network
• EThe host network card and the switch port must be capable of operating in full-duplex mode.

• A
  92% (35)
• C
  5% (2)
• D
  3% (1)

Explanation

Full-duplex allows simultaneous send and receive over dedicated transmit/receive wire pairs, eliminating any possibility of collisions (A) - CSMA/CD is completely disabled. This only works in a point-to-point topology where each device has its own dedicated switch port (B), because sharing a port (as with a hub) would reintroduce contention. Both the NIC and the switch port must both be capable of and configured for full-duplex (E); if either end defaults to half-duplex, the whole link runs half-duplex.

Why the distractors are wrong:

• C is the opposite of reality - hubs are half-duplex only devices; they broadcast to all ports on a shared medium, making full-duplex physically impossible.
• D describes CSMA/CD carrier-sense behavior, which is a half-duplex concept; full-duplex doesn't need to "listen before transmitting" because the send and receive paths are electrically separate.

Memory tip: Think "full-duplex = full freedom" - no collisions, no carrier-sense, no sharing. The price of that freedom is that both ends (NIC + switch port) must agree on full-duplex, and each device needs its own port.

No community discussion yet for this question.