Which of the following addresses is a class A address?

The correct answer is 121.12.12.248.

Key Points

• IP addresses are categorized into classes to manage the allocation of addresses in networks efficiently.
  • An Internet Protocol address (IP address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.
  • IPv4 addresses are divided into five classes (A, B, C, D, and E).
  • Class A addresses range from 1.0.0.0 to 126.0.0.0.
  • Class A addresses are used for networks with a very large number of hosts.
  • In the given options, 121.12.12.248 falls within the range of Class A addresses.
  • Other options given (130.12.12.248, 128.12.12.248, and 129.12.12.248) fall within the range of Class B addresses (128.0.0.0 to 191.255.255.255).

Additional Information

• Class A addresses have a default subnet mask of 255.0.0.0.
• Class A networks can have up to 16,777,214 hosts per network.
• The first octet of a Class A address is used to identify the network, and the remaining three octets are used to identify the host.
• IP address classes help in efficient IP address management and allocation.
• Knowledge of IP address classes is crucial for network design and implementation.