Certified Information Systems Security Professional (CISSP) — Question 400
Two computers, each with a single connection on the same physical 10 gigabit Ethernet network segment, need to communicate with each other. The first machine has a single Internet Protocol (IP) Classless Inter-Domain Routing (CIDR) address of 192.168.1.3/30 and the second machine has an IP/CIDR address
192.168.1.6/30. Which of the following is correct?
Answer options
- A. Since each computer is on a different layer 3 network, traffic between the computers must be processed by a network bridge in order to communicate
- B. Since each computer is on the same layer 3 network, traffic between the computers may be processed by a network router in order to communicate
- C. Since each computer is on the same layer 3 network, traffic between the computers may be processed by a network bridge in order to communicate
- D. Since each computer is on a different layer 3 network, traffic between the computers must be processed by a network router in order to communicate
Correct answer: D
Explanation
The correct answer is D because the two computers are on different layer 3 networks, indicated by their CIDR notations. Options A and C incorrectly suggest that a network bridge is sufficient for communication, while B incorrectly states that a router is necessary when they are indeed on the same network.