Bird
0
0

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:
  1. 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.
  2. 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.
  3. Final Answer:

    16 bits -> Option D
  4. Quick Check:

    Class B uses 16 bits for network by default [OK]
Quick Trick: Class B IP uses 16 bits for network portion [OK]
Common Mistakes:
MISTAKES
  • Assuming 8 bits for Class B network portion
  • Confusing Class B with Class C default mask

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Computer Networks Quizzes