H12-811_V2.0 practice question 5 of 15

Which of the following IP addresses cannot be configured for a host by default?

Full set: 60 questions
Answer options
A: 172.16.1.1/16
B: 192.168.1.1/24
C: 10.0.0.1/8
D: 224.0.0.1/24 Correct answer
Correct Answer:
D. 224.0.0.1/24
Explanation

The IP address 224.0.0.1 belongs to the Class D address range (224.0.0.0 to 239.255.255.255), which is reserved for IP multicast traffic. These addresses are used to identify a group of destination hosts, not a single host interface. Therefore, a Class D address cannot be configured as a unicast IP address for a host. The address 224.0.0.1 is specifically assigned to the "All Hosts" multicast group on the local network segment.

Why Incorrect

A. 172.16.1.1/16 is a valid private Class B IP address that can be assigned to a host.
B. 192.168.1.1/24 is a valid private Class C IP address that can be assigned to a host.
C. 10.0.0.1/8 is a valid private Class A IP address that can be assigned to a host.

References

1. Huawei. (2020). HCIA-Datacom V1.0 Training Material (Version 1.0). Section: IP Addressing Basics

Subsection: IP Address Classification. "Class D addresses are multicast addresses

ranging from 224.0.0.0 to 239.255.255.255." (Page 2-15).

2. Postel

J. (1981). RFC 791: Internet Protocol. The Internet Society. Section 3.1

"Class D addresses are used for multicasting".

3. Deering

S. (1989). RFC 1112: Host Extensions for IP Multicasting. The Internet Society. Section 4

"Class D addresses are used as destination addresses for multicast datagrams... They are not to be used as source addresses."

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