Which class of IPv4for address is is used for multicast?

Question

Options

• AClass A
• BClass B
• CClass D
• DClass C

• A
  11% (3)
• B
  4% (1)
• C
  81% (22)
• D
  4% (1)

Explanation

Class D (choice C) is reserved exclusively for multicast traffic, covering the address range 224.0.0.0 – 239.255.255.255. Multicast allows a single packet to be delivered simultaneously to a group of interested receivers, making Class D essential for protocols like OSPF, RIP v2, and video streaming.

Why the distractors are wrong:

• Class A (choice A): Covers 1.0.0.0–126.255.255.255 and is used for large unicast networks (e.g., ISPs, governments).
• Class B (choice B): Covers 128.0.0.0–191.255.255.255 and is used for medium-sized unicast networks.
• Class C (choice D): Covers 192.0.0.0–223.255.255.255 and is used for small unicast networks (most common for home/business subnets).

Memory tip: Think "D for Deliver-to-many" - Class D is the only class that starts with the digit 2 in all four ranges (224–239), and the letter D visually looks like a broadcast dish pointing outward to a group.

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