Why is the NIC considered the "gatekeeper"?
What will be an ideal response?
The NIC's responsibility is to examine every frame that is received and either allow it access to the computer or reject it. In order for the frame to be accepted, the destination MAC address must match the NIC's MAC address, or it is refused. There are two exceptions to this rule. If the destination MAC address is a broadcast, then the NIC accepts it. If the NIC is put in promiscuous mode, then it will accept all frames.
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