What is the first step a router takes when it receives an Ethernet frame?
A) It performs a lookup of the MAC address.
B) It checks the integrity of the frame.
C) It performs a lookup of the IP address.
D) It determines whether the frame is unicast, multicast, or broadcast.
B
Explanation: B) The Ethernet header contains a field called the Frame Check Sequence (FCS) that is used to check the integrity of a frame after it has been sent from source to destination. Before further processing is allowed, the first step should be to check that the frame has not been changed while in transit.
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