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Given the IP address 150.25.10.5, what is its network class and default subnet mask?

medium📝 Analysis Q4 of 15
Computer Networks - IP Addressing
Given the IP address 150.25.10.5, what is its network class and default subnet mask?
AClass B, 255.255.0.0
BClass A, 255.0.0.0
CClass C, 255.255.255.0
DClass D, No default mask
Step-by-Step Solution
Solution:
  1. Step 1: Determine the class from the first octet

    The first octet is 150, which falls between 128 and 191, so it is Class B.
  2. Step 2: Recall the default subnet mask for Class B

    Class B default subnet mask is 255.255.0.0.
  3. Final Answer:

    Class B, 255.255.0.0 -> Option A
  4. Quick Check:

    150 in 128-191 = Class B [OK]
Quick Trick: 150 is in Class B range 128-191 [OK]
Common Mistakes:
MISTAKES
  • Mistaking 150 as Class A
  • Choosing Class C mask for 150
  • Confusing Class D with Class B

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