Which of the following is a characteristic of a subnet created with a /31 prefix?

The correct answer is A. There is no broadcast address on the network. A /31 subnet in IPv4 provides exactly two IP addresses (e.g., 192.168.1.0/31 usable: 192.168.1.0 and 192.168.1.1). Traditionally, these would represent a network address and a broadcast address, but RFC 3021 redefines /31 subnets for point-to-point links, such as router-to…

Network and Infrastructure Performance Management Integration

Question

Options

AThere is no broadcast address on the network.
BThe address is only used as a loopback address.
CThis specifies a single host address.
DThe address is only used for router IDs.

How the community answered

(45 responses)

A
84% (38)
B
2% (1)
C
9% (4)
D
4% (2)

Explanation

A /31 subnet in IPv4 provides exactly two IP addresses (e.g., 192.168.1.0/31 usable: 192.168.1.0 and 192.168.1.1). Traditionally, these would represent a network address and a broadcast address, but RFC 3021 redefines /31 subnets for point-to-point links, such as router-to- router connections. In a /31 subnet: Broadcast address is not used. Both IPs are treated as usable host addresses. It's ideal for point-to-point links, saving address space. This is widely supported and standardized in Nokia IP and routing platforms.

Topics

#/31 prefix#subnet#broadcast address#point-to-point link

Community Discussion

No community discussion yet for this question.

Full 4A0-100 Practice