Subnetting Practice (obj 1.7)

Question 1

What is subnetting?

Answer 1

Involves dividing a larger network into smaller, manageable sub-networks

Subnetting helps in efficient network management and organization.

Question 2

What does CIDR notation stand for?

Answer 2

Classless Inter-Domain Routing notation

CIDR notation is used to represent subnets and is expressed as an IP address followed by a slash and a number.

Question 3

How is CIDR notation expressed?

Answer 3

As IP address followed by a slash and a number indicating the subnet mask length

For example, 10.10.10.0/24.

Question 4

What is a memory aid for subnetting?

Answer 4

Memorize a subnetting chart for quick reference during exams

A ‘dump sheet’ can be utilized to jot down important information during the test.

Question 5

What is the first step in a problem-solving approach to subnetting?

Answer 5

Identify the total number of IPs available in the given subnet

This helps in determining how to allocate IPs for various departments.

Question 6

What should you account for when subnetting?

Answer 6

Network address and broadcast address in each subnet

These addresses are not assignable to hosts.

Question 7

What is recommended for rounding department sizes in subnetting?

Answer 7

Round up department sizes to factors of 2 for efficient allocation

This ensures there are enough IPs for all users.

Question 8

How many users are in the IT department in the practice problem?

Answer 8

54 users

This number is rounded up to 64 for subnetting.

Question 9

What is the CIDR notation for the IT department?

Answer 9

/26

This notation accommodates 64 IP addresses.

Question 10

How many users are in the instructors’ department?

Answer 10

32 users

This number is also rounded up to 64 for subnetting.

Question 11

What is the CIDR notation for the instructors’ department?

Answer 11

/26

This allows for 64 IP addresses.

Question 12

How many users are in the sales department?

Answer 12

5 users

This number is rounded up to 8 for subnetting.

Question 13

What is the CIDR notation for the sales department?

Answer 13

/29

This provides 8 IP addresses.

Question 14

How many users are in the administration department?

Answer 14

3 users

This number is rounded up to 8 for subnetting.

Question 15

What is the CIDR notation for the administration department?

Answer 15

/29

This also provides 8 IP addresses.

Question 16

How many IPs are left unused after subnetting?

Answer 16

112 IPs left

This is calculated by subtracting allocated IPs from the total.

Question 17

What is the CIDR notation for the unused IPs?

Answer 17

/26

This accounts for the remaining 64 IPs.

Question 18

How many assignable IP addresses exist in the network 172.16.1.0/27?

Answer 18

30

Total IPs for /27: 32, assignable IPs (excluding network and broadcast): 30.

Question 19

How many assignable IP addresses exist in the network 192.168.1.0/28?

Answer 19

14

Total IPs for /28: 16, assignable IPs: 16 - 2 = 14.

Question 20

What should you pay attention to in subnetting questions?

Answer 20

Whether the question asks for assignable, usable, or total IPs

This distinction is crucial for accurate calculations.

Question 21

What formula can be used in subnetting?

Answer 21

Subnetting formulas ( ℎ ) where h represents the number of host bits

This helps calculate the number of available IPs.

Question 22

What is a useful tool for subnetting practice?

Answer 22

A subnetting chart

Understanding how to apply CIDR notation effectively is essential.