Topic: Computer Networks
Computer A is assigned with IP address 10.0.0.126 and computer B is assigned with IP address 10.0.0.131. Network mask is 255.255.255.192 in both cases. Which of the following statements is true?
- A. Computer A and B form part of a multicast group
- B. 10.0.0.x addresses have to be allocated by IANA and cannot be used by hosts
- C. The given network mask cannot be assigned to class A IP addresses
- D. A router will be required to communicate between A and B
Answer: D. A router will be required to communicate between A and B
Explanation: The subnet mask 255.255.255.192 translates to a /26 prefix, giving a block size of 64.
The subnets are 10.0.0.0, 10.0.0.64, 10.0.0.128, and 10.0.0.192.
Computer A (10.0.0.126) belongs to the 10.0.0.64/26 subnet (valid IP range 65-126).
Computer B (10.0.0.131) belongs to the 10.0.0.128/26 subnet (valid IP range 129-190).
Since A and B are in different subnets, they cannot communicate directly over the local network and require a router.