FAQs On Classless Inter Domain Routing (CIDR)
Q.1: What is CIDR (Classless Inter-Domain Routing)?
Answer:
CIDR, or Classless Inter-Domain Routing, is a networking technique introduced to overcome the limitations of the traditional IP addressing system, which was based on classes. CIDR allows more flexible allocation of IP addresses by eliminating the strict class-based divisions.
Q.2: What problem does CIDR solve?
Answer:
CIDR solves the problem of IP address exhaustion and inefficient address allocation. With the growth of the internet, the original IP address classes (Class A, B, and C) led to wastage of IP addresses due to their fixed size. CIDR enables the allocation of variable-sized blocks of IP addresses, improving address space utilization.
Q.3: How does CIDR differ from traditional IP addressing?
Answer:
Traditional IP addressing used classes with fixed address ranges (e.g., Class A: 1.0.0.0 to 126.0.0.0). CIDR uses a format that combines an IP address and a prefix length to denote the network and subnet portion (e.g., 192.168.1.0/24).
Classless Inter Domain Routing (CIDR)
Classless Inter-Domain Routing (CIDR) is a method of IP address allocation and IP routing that allows for more efficient use of IP addresses. CIDR is based on the idea that IP addresses can be allocated and routed based on their network prefix rather than their class, which was the traditional way of IP address allocation.
CIDR addresses are represented using a slash notation, which specifies the number of bits in the network prefix. For example, an IP address of 192.168.1.0 with a prefix length of 24 would be represented as 192.168.1.0/24. This notation indicates that the first 24 bits of the IP address are the network prefix and the remaining 8 bits are the host identifier.