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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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(ii) A bridge uses IP addresses while a router uses MAC addresses — this statement is NOT true (it has the roles reversed).

The correct relationship is the opposite: a bridge operates at the Data Link layer and forwards frames using MAC addresses; a router operates at the Network layer and forwards packets using IP addresses.

The other statements are all true: both devices selectively forward traffic (rather than broadcasting everything); a transparent bridge does build its forwarding table by inspecting (learning from) the source addresses of incoming frames; and a router, working at the Network layer, is capable of connecting a LAN to a WAN (crossing different network technologies), unlike a bridge which stays within the same LAN/broadcast domain type.

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