Subnetting Speed Practice #3: Answers

 In 200-301 V1 Ch14: Analyzing IPv4 Subnets, 200-301 V1 Part 4: IPv4 Addressing, CCENT-OLD, IPv4 Address Drills

This post makes no sense without reading this post first. The earlier post lists 5 subnetting problems, and tells you to time yourself. The answers are below the fold in this post. Don’t look til you try it for yourself! Post questions if you have them.

1) 9.200.200.200/15

2) 100.100.100.100/19

3) 151.151.151.151/23

4) 201.201.201.201/27

5) 223.223.221.221/30

Problem Network Bits Subnet Bits Host Bits # Hosts

1

8

7

17

131,070

2

8

11

13

8190

3

16

7

9

510

4

24

3

5

30

5

24

6

2

2

The following table lists the subnet ID and subnet broadcast address. It does not list the range of addresses; the range of usable addresses is simply the range of numbers between the subnet ID and subnet broadcast address.

Problem Subnet ID Broadcast Address

1

9.200.0.0

9.201.255.255

2

100.100.96.0

100.100.127.255

3

151.151.150.0

151.151.151.255

4

201.201.201.192

201.201.201.223

5

223.223.221.220

223.223.221.223

Subnetting Speed Practice #3
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Gavin

6 minutes for all 5. On average I find it takes me about a minutes if there’s an “interesting” octet. 45s otherwise. Thanks for posting these practice drills and questions – they are helpful in prepping for the CCENT.

lyjo

You’re welcome, Gavin! Keep up the practice – even a 25% reduction in time required is a big help on exam day.

Maxim

There is a mistake in the answer on Problem 2’s Network bit and Subnet bit – it’s class B network.

Maxim

Sorry@ it’s class A )

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