Which of the following are not valid Class B network IDs?
- 130.0.0.0
- 191.255.0.0
- 128.0.0.0
- 150.255.0.0
- All are valid Class B network IDs.
Explanation: All Class B networks begin with values between 128 and 191, inclusive, in their first octets. The network ID has any value in the 128–191 range in the first octet, and any value from 0 to 255 inclusive in the second octet, with decimal 0s in the final two octets. Two of the answers show a 255 in the second octet, which is acceptable. Two of the answers show a 0 in the second octet, which is also acceptable.
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