GCIA · Question #29
Which of the following is a valid IP address for class B Networks?
The correct answer is D. 172.157.88.3. Class B networks span the 128.0.0.0 to 191.255.255.255 range, defined by the first two bits being '10'. Only 172.157.88.3 falls within this range.
Question
Which of the following is a valid IP address for class B Networks?
Options
- A225.128.98.7
- B80.33.5.7
- C212.136.45.8
- D172.157.88.3
How the community answered
(65 responses)- A15% (10)
- B3% (2)
- C6% (4)
- D75% (49)
Why each option
Class B networks span the 128.0.0.0 to 191.255.255.255 range, defined by the first two bits being '10'. Only 172.157.88.3 falls within this range.
225.128.98.7 has a first octet of 225, which falls in the 224-239 range reserved for Class D multicast addresses, not Class B.
80.33.5.7 has a first octet of 80, which falls in the 1-126 range reserved for Class A networks.
212.136.45.8 has a first octet of 212, which falls in the 192-223 range reserved for Class C networks.
172.157.88.3 is a valid Class B address because the first octet (172) falls within the Class B range of 128 to 191. Class B networks are identified by the leading two bits '10' in binary, covering 128.0.0.0 through 191.255.255.255. The 172.x.x.x block is a well-known Class B space, with 172.16.0.0 to 172.31.255.255 reserved for private use under RFC 1918.
Concept tested: IPv4 classful addressing and range identification
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/tcpip-addressing-and-subnetting
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