N10-005 · Question #585
Which of the following is true about an IP address if the first bit is a one and the second bit is a zero?
The correct answer is B. The address is a Class B address. In classful IPv4 addressing, a Class B address is identified by the first two bits being '10', meaning the first bit is 1 and the second bit is 0.
Question
Which of the following is true about an IP address if the first bit is a one and the second bit is a zero?
Options
- AThe address is a Class A address.
- BThe address is a Class B address.
- CThe address is a Class C address.
- DThe address is a Class D address.
How the community answered
(39 responses)- A3% (1)
- B72% (28)
- C18% (7)
- D8% (3)
Why each option
In classful IPv4 addressing, a Class B address is identified by the first two bits being '10', meaning the first bit is 1 and the second bit is 0.
Class A addresses begin with a leading bit of '0' (range 0.0.0.0 to 127.255.255.255), not '1'.
Classful IPv4 addressing defines Class B by the leading bit pattern '10', covering the range 128.0.0.0 to 191.255.255.255; a first bit of 1 and second bit of 0 uniquely identifies a Class B address.
Class C addresses begin with a leading bit pattern of '110', requiring the first three bits to be 1, 1, 0.
Class D addresses begin with a leading bit pattern of '1110' and are reserved for multicast, not described by first bit 1 and second bit 0 alone.
Concept tested: Classful IPv4 address class identification by bit pattern
Source: https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc786128(v=ws.10)
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