IPv4 Subnetting & VLSM Mastery

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40 Terms

1
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What is the subnet mask for /25?

255.255.255.128

2
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What is the subnet mask for /26?

255.255.255.192

3
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What is the subnet mask for /27?

255.255.255.224

4
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What is the subnet mask for /28?

255.255.255.240

5
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What is the subnet mask for /29?

255.255.255.248

6
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What is the subnet mask for /30?

255.255.255.252

7
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How many usable hosts in a /25?

126

8
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How many usable hosts in a /26?

62

9
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How many usable hosts in a /27?

30

10
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How many usable hosts in a /28?

14

11
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How many usable hosts in a /29?

6

12
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How many usable hosts in a /30?

2

13
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Block size / increment for /25?

128

14
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Block size for /26?

64

15
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Block size for /27?

32

16
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Block size for /28?

16

17
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Block size for /29?

8

18
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Block size for /30?

4

19
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Network address of 172.16.45.100/20?

172.16.32.0

20
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Broadcast of 172.16.45.100/20?

172.16.47.255

21
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First usable host in 192.168.10.64/26?

192.168.10.65

22
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Last usable host in 192.168.10.64/26?

192.168.10.126

23
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Broadcast of 10.0.23.150/28?

10.0.23.159

24
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Network address of 10.0.23.150/28?

10.0.23.144

25
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Need 500 hosts → smallest subnet?

/22

26
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Need 300 hosts → smallest subnet?

/23

27
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Need 100 hosts → smallest subnet?

/25

28
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Need 50 hosts → smallest subnet?

/26

29
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Need 25 hosts → smallest subnet?

/27

30
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Need 12 hosts → smallest subnet?

/28

31
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Need 5 hosts → smallest subnet?

/29

32
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Need 2 hosts → smallest subnet?

/30

33
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Summarize 192.168.0.0/24 to 192.168.3.0/24?

192.168.0.0/22

34
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Summarize 10.10.0.0/24 to 10.10.7.0/24?

10.10.0.0/21

35
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Summarize 172.20.16.0/20 to 172.20.31.0/20?

172.20.16.0/20 (already summarized) or 172.20.0.0/19

36
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VLSM: From 192.168.1.0/24, give subnets for 60, 30, 12, 4 hosts (biggest first)

192.168.1.0/26 → .64/27 → .96/28 → .112/30

37
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VLSM: From 10.0.0.0/22, give 200, 100, 10 hosts

10.0.0.0/23 → 10.0.2.0/24 → 10.0.3.0/28

38
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First subnet after taking /25 from 172.16.0.0/22?

172.16.1.0/25 (128-host block taken, next is 1.0)

39
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What is the summarized route for 172.16.8.0/21 – 172.16.15.0/21?

172.16.8.0/21

40
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What is the summarized route for 192.168.4.0/24 – 192.168.7.0/24?

192.168.4.0/22