For the IP address 130.45.67.89, how many bits are allocated to the network portion in its default classful subnet mask?

hard📝 Application Q8 of 15

Computer Networks - IP Addressing

For the IP address 130.45.67.89, how many bits are allocated to the network portion in its default classful subnet mask?

A32 bits

B8 bits

C24 bits

D16 bits

Step-by-Step Solution

Solution:

Step 1: Determine the class of the IP address
The first octet is 130, which falls between 128 and 191, so it is Class B.
Step 2: Identify default subnet mask bits for Class B
Class B default subnet mask is 255.255.0.0, which means 16 bits are used for the network portion.
Final Answer:
16 bits -> Option D
Quick Check:
Class B uses 16 bits for network by default [OK]

Quick Trick: Class B IP uses 16 bits for network portion [OK]

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