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Module 2: Data Link Layer & MAC Sublayer

20162m

Which of the following is NOT true with respect to a transparent bridge and a router?
(i) Both bridge and router selectively forward data packets
(ii) A bridge uses IP addresses while a router uses MAC addresses
(iii) A bridge builds up its routing table by inspecting incoming packets
(iv) A router can connect between a LAN and WAN

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Answer

(ii) is NOT true.

Explanation

The statement reverses the addresses used by bridges and routers.

  • A transparent bridge operates at the Data Link layer and learns a forwarding table by examining the source MAC addresses of incoming frames.
  • A router operates at the Network layer and makes forwarding decisions using logical IP addresses.
  • Both can selectively forward traffic, and a router can connect different networks such as a LAN and WAN.

Therefore, (ii) A bridge uses IP addresses while a router uses MAC addresses is false.

Final answer: (ii).

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