Which of the following are not valid Class A network IDs? (Choose two answers.)
- 1.0.0.0
- 130.0.0.0
- 127.0.0.0
- 9.0.0.0
Explanation: Class A networks have a first octet in the range of 1–126, inclusive, and their
network IDs have a 0 in the last three octets. 130.0.0.0 is actually a Class B network
(first octet range 128–191, inclusive). All addresses that begin with 127 are reserved,
so 127.0.0.0 is not a Class A network.
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