Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Computer Networks Concept of Layering Network Layer
A packet filtering firewall operates at which of the following OSI layers?
1
At the application layer
2
At the transport layer
3
At the network
4
More than one of the above
5
None of the above