Question

at which protocol layer does the berkeley packet filter (bpf) operate? a protocol b internetwork c transport d data link

Explanation:

The Berkeley Packet Filter (BPF) operates at the data - link layer. It is designed to capture packets at a low - level and filter them based on certain criteria. The data - link layer is responsible for the transfer of data between adjacent network nodes in a network segment.

Answer:

D. Data Link