An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be

The address resolution protocol (ARP) is used for

In a packet switching network, packets are routed from source to destination along a single path having two intermediate nodes. If the message size is 24 bytes and each packet contains a header of 3 bytes, then the optimum packet size is:

The maximum window size for data transmission using the selective reject protocol with n-bit frame sequence numbers is: