What is the difference between policing and shaping?

Question

Options

• APolicing: Transmit and mark, then transmit the packets. Shaping: Buffer the exceeding packets.
• BPolicing: Transmit the packets. Shaping: Buffer the exceeding packets.
• CPolicing: Transmit, drop or mark, then transmit the packets. Shaping: Buffer the exceeding
• DPolicing: Buffer the exceeding packets. Shaping: Transmit and mark, then transmit the packets.

• A
  6% (1)
• C
  89% (16)
• D
  6% (1)

Explanation

Traffic policing enforces a rate limit by taking an immediate action on packets that exceed the configured rate: conforming packets are transmitted, and exceeding packets are either dropped or re-marked (e.g., lowering the DSCP value) and then transmitted. It does not introduce delay. Traffic shaping also enforces a rate limit, but instead of dropping excess packets, it places them in a queue (buffer) and transmits them later when the rate falls below the limit-smoothing the traffic flow at the cost of added delay and memory. Option A is wrong because it omits the drop action for policing. Option B is wrong because it omits the mark-then-transmit action. Option D reverses the two behaviors entirely.

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