Which of the following statements about the forwarding plane of switching equipment is incorrect?

Question

Options

• ARealize packet encapsulation and decapsulation
• BForwarding of main service board to control board
• CProvide high-speed non-blocking data channel
• DAll kinds of messages can be realized

• A
  5% (2)
• B
  81% (35)
• C
  9% (4)
• D
  5% (2)

Explanation

Option B is incorrect because in switching equipment, the forwarding plane moves data between service/line boards (port-to-port traffic), not from a service board to the control board - that would describe control plane communication, not forwarding plane operation. The control board belongs to the control plane, which handles routing protocols, topology decisions, and management; the forwarding plane simply executes those decisions at high speed without involving the control board in data transit.

Options A, C, and D describe genuine forwarding plane responsibilities: packet encapsulation/decapsulation occurs as frames enter and exit the switch fabric (A), the switching fabric is specifically designed as a high-speed, non-blocking crossbar or similar interconnect (C), and the forwarding plane must handle diverse frame/packet types - Ethernet, IP, MPLS, etc. (D).

Memory tip: Think of the forwarding plane as a highway and the control plane as the traffic department. Cars (data) drive between on-ramps and off-ramps (service boards) on the highway - they never pull into the traffic department office (control board). Any answer that sends data to the control board is mixing up the two planes.

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