CISSP: Certified Information Systems Security Professional

By ISC · Question Mode

QuestionQ110

VerifiedCommunication and Network Security

Two computers, each with a single connection on the same physical 10-gigabit Ethernet network segment, must communicate with one another. The first machine has one Internet Protocol (IP) Classless Inter-Domain Routing (CIDR) address of 192.168.1.3/30, and the second machine has an IP/CIDR address of 192.168.1.6/30. Which of the following is correct?

Explanation

A /30 prefix has four addresses. 192.168.1.3/30 belongs to the 192.168.1.0/30 network and 192.168.1.6/30 belongs to the 192.168.1.4/30 network, making them different Layer 3 networks. Communication between distinct IP networks requires a router; a bridge operates at Layer 2 and does not route between IP subnets.

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