Identify the error in this statement: "Class A IP addresses have a default subnet mask of 255.255.0.0."

medium📝 Analysis Q6 of 15

Computer Networks - IP Addressing

AClass A addresses start with 128-191

BThe subnet mask is incorrect; Class A uses 255.0.0.0

CClass A addresses use 255.255.255.0 mask

DClass A addresses are multicast addresses

Step-by-Step Solution

Solution:

Step 1: Recall Class A default subnet mask
Class A uses 255.0.0.0 as default subnet mask, not 255.255.0.0.
Step 2: Verify other options
Class A addresses start with 1-126, not 128-191; 255.255.255.0 is Class C mask; Class A is not multicast.
Final Answer:
The subnet mask is incorrect; Class A uses 255.0.0.0 -> Option B
Quick Check:
Class A mask = 255.0.0.0 [OK]

Quick Trick: Class A mask always starts with 255.0 [OK]

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