1-14 INTRODUCTION TO CIDR

Question 1

What is CIDR?

Answer 1

Classless Inter Domain Routing

A method for allocating IP addresses and managing IP routing.

Question 2

Why was CIDR introduced?

Answer 2

To improve the efficiency and scalability of IP address allocation and routing on the Internet.

Question 3

What is one reason for introducing CIDR?

Answer 3

To counter the rapid exhaustion of IPv4 addresses.

Question 4

What is another reason for introducing CIDR?

Answer 4

To decrease the size and complexity of routing tables on the Internet.

Question 5

What are key features of CIDR?

Answer 5

• Classless system
• Flexible allocation of IP addresses
• Doesn’t limit networks to predefined sizes.

Question 6

What notation does CIDR introduce?

Answer 6

Slash notation (example: 192.168.1.0/24).

Question 7

What does the number after the slash in CIDR notation indicate?

Answer 7

The number of bits used for the network portion.

Question 8

How does CIDR improve routing efficiency?

Answer 8

By aggregating multiple IP addresses into a single entry in routing tables.

Question 9

What has been the impact of CIDR on Internet routing tables?

Answer 9

Routing table aggregation.

Question 10

What does routing table aggregation help manage?

Answer 10

The growth of routing tables, crucial for internet scalability.