Question

1- List the classes in classful addressing and define the application of each class (unicast, Multicast, broadcast, Reserved).
2- Give an Example for a Connectionless and a Connection oriented Protocols.
3- A network Mask 255.255.255.240 how many usable addresses can be assigned to Hosts in a subnet?

Answer 1

Answer1:

The classes in classful addressing are: Class A, Class B, Class C, Class D, and Class E

• Now the first three classes i,e Class A, B, and C are used for unicast communication
• Class D is used for multicast communication
• Class E is reserved

Answer 2:

• With a connectionless protocol, the sender does not try to check the identity of a receiver or ask for approval until transmitting details, and it does not allow error detection and correction.
• IP and UDP are examples of protocols connectionless.
• With a connection-oriented protocol, before transmitting messages, a connection is formed between one sender and one recipient.
• Management functions such as verifying reception, verifying data integrity, monitoring message flow, and securing message content are performed by this protocol. An example of a connection-oriented protocol is TCP.

Answer 3:

We have given , subnet mask = 255.255.255.240

Converting subnet mask into binary = 11111111.11111111.11111111.11110000

First 3 octets here represents the network part and the last octet represents the host part. Here the number of host bits = 4

We know , usuable hosts in subnet = 2^n - 2 , here n = 4

2^4 - 2 = 2x 2 x2 x 2 - 2 = 16 - 2 = 14 hosts