address is 192.168.2.1, the router checks in the routing table if a matching route entry is available for the network 192.168.2.0 / 24. The router forwards the packet to the appropriate interface on which the network is connected or aware of the destination. If not available, the packet is dropped.
Question 11
What does a switch do, when it is unaware of the destination mac-address in a frame?
Explanation
The switch would flood the frame to all ports, apart from the port on which the frame was received. Once the response is received, the switch would add the source mac-address in the response frame to its mac-address table relevant to the port which sent the response.
Question 12
A switch has built its mac-address table dynamically. The switch is powered off and re-booted after some time. Would the info in the mac-address table be available after re-boot?
Explanation
The info in the mac-address table would not be available since it would be cleared on a re-boot.
Question 13
What is the fundamental difference between classful and classless routing protocols?
Explanation
In classful routing, there is no concept of subnets. The routing protocol supports only classful addressing like class A, class B, class C etc. In classless routing, subnet mask information is carried inside the routing protocol packets as opposed to classful routing where this information is not available.
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