What does CIDR stand for?

What does CIDR stand for?

• A. Classless Inter-Domain Routing
• B. Client Internet Domain Routing
• C. Compact Internal Domain Routing
• D. Centralized Internet Data Routing

Answer: (A)

CIDR is about flexible IP address allocation and scalable Internet routing. It stands for Classless Inter-Domain Routing, a term that captures two key ideas: moving away from fixed class A/B/C boundaries and enabling efficient routing between different networks (or domains) on the Internet. The notation 192.0.2.0/24, for example, shows how CIDR represents a block of addresses with a prefix length, allowing routers to aggregate routes and keep routing tables manageable. The other options don’t reflect standard networking terminology for this concept, so they don’t describe CIDR accurately.

CIDR is about flexible IP address allocation and scalable Internet routing. It stands for Classless Inter-Domain Routing, a term that captures two key ideas: moving away from fixed class A/B/C boundaries and enabling efficient routing between different networks (or domains) on the Internet. The notation 192.0.2.0/24, for example, shows how CIDR represents a block of addresses with a prefix length, allowing routers to aggregate routes and keep routing tables manageable. The other options don’t reflect standard networking terminology for this concept, so they don’t describe CIDR accurately.