5. Subnetting And CIDR

Question 1

1. Where do the bits for the subnet ID come from?

Answer 1

The subnet ID bits are borrowed from the host ID.

Question 2

2. Why isn’t subnetting as important now as it was in the past?

Answer 2

Because subnetting functions have been subsumed under CIDR.

Question 3

3. What does classless in classess interdomain routing refer to?

Answer 3

Classless refers to the fact that the traditional network address classes (A, B, C, D) are no longer used but are replaced by the CIDR prefix.

Question 4

4. How many hosts can there be on a /26 network?

Answer 4

The host ID field is 6 bits, and so there can be 26 - 2 = 62 hosts.

Question 5

5. What is combing several smaller networks into a single larger network range called?

Answer 5

Combining several smaller networks into a single larger network range is called supernetting.