Computer networking UE Past Papers Questions.

Change the following IPv4 addresses from binary notation to dotted-decimal notation.

• 10000001 00001011 00001011 11101111
• 11000001 10000011 00011011 11111111

Answer / Solution

Find the error, if any, in the following IPv4 addresses.

• 111.56.045.78
• 221.34.7.8.20
• 75.45.301.14
• 11100010.23.156.23

Answer / Solution

Find the class of each address.

•  00000001 00001011 00001011 11101111
•  11000001 10000011 00011011 11111111
• 14.23.120.8
• 252.5.15.111

Answer / Solution

An ISP is granted a block of addresses starting with 190.100.0.0/16 (65,536 addresses). The ISP needs to distribute these addresses to three groups of customers as follows:

a. The first group has 64 customers; each needs 256 addresses.

b. The second group has 128 customers; each needs 128 addresses.

c. The third group has 128 customers; each needs 64 addresses.

Design the sub-blocks and find out how many addresses are still available after these allocations.

Answer / Solution

In the OSI model, the __ layer is concerned with finding the best path for the data to move from one point to the next within the network.

• data link
• network
• physical
• application

Answer / Solution