Chapter 4: Easy Subnetting

Question 1

What are the benefits of subnetting?

Answer 1

Reduces network traffic
Optimized network performance
Simplified management
Facilitated spanning of large geographical distances

Question 2

2^1

Answer 2

2

Question 3

2^2

Answer 3

4

Question 4

2^3

Answer 4

8

Question 5

2^4

Answer 5

16

Question 6

2^5

Answer 6

32

Question 7

2^6

Answer 7

64

Question 8

2^7

Answer 8

128

Question 9

2^8

Answer 9

256

Question 10

2^9

Answer 10

512

Question 11

2^10

Answer 11

1024

Question 12

2^11

Answer 12

2048

Question 13

2^12

Answer 13

4096

Question 14

2^13

Answer 14

8192

Question 15

2^14

Answer 15

16384

Question 16

What is the CIDR range for a class A network?

Answer 16

/8 through /15

Question 17

What is the CIDR range for a class B network?

Answer 17

/16 through /23

Question 18

What is the CIDR range for a class C network?

Answer 18

/24 through /30

Question 19

What do we know about /25?

Answer 19

128 mask
1 bit on, 7 bits off (10000000)
Block size of 128
2 subnets, each with 126 hosts

Question 20

What do we know about /26?

Answer 20

192 mask
2 bits on, 6 bits off (11000000)
Block size of 64
4 subnets, each with 62 hosts

Question 21

What do we know about /27?

Answer 21

224 mask
3 bits on, 5 bits off (11100000)
Block size of 32
8 subnets, each with 30 hosts

Question 22

What do we know about /28?

Answer 22

240 mask
4 bits on, 4 bits off (11110000)
Block size of 16
16 subnets, each with 14 hosts

Question 23

What do we know about /29?

Answer 23

248 mask
5 bits on, 3 bits off (11111000)
Block size of 8
32 subnets, each with 6 hosts

Question 24

What do we know about /30?

Answer 24

252 mask
6 bits on, 2 bits off (11111100)
Block size of 4
64 subnets, each with 2 hosts

Question 25

2^15

Answer 25

32768

Question 26

2^16

Answer 26

65,536