1. What type of IPv4 address was obsoleted in the 1990s?
- classless
- classful
- CIDR
- subnets
Explanation: Classful addressing became obsolete in the 1990s.
2. Which of the following class addresses were used by customers to assign addresses? (Choose all that apply)
- Class A
- Class B
- Class C
- Class D
- Class E
Explanation: Class A, B, and C were used by customers to assign addresses. Class D was reserved for multicast address. Class E was reserved for experimental purposes.
3. Classful addressing is an efficient method of allocating IPv4 addresses.
- true
- false
Explanation: Classful addressing is no longer used. Classless addressing is the more efficient method of allocating IPv4 address.