Solution Exercises III

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Calculate the Network Address, the broadcast address and the host range. Host in Binary. 11000000. 10101000. 10110100. 01011110. Subnet Mask in Binary.
Student Name

Date

DT021-081/2 COMMUNICATIONS NETWORKS 1 Solutions to Exercises III

Example Given a Host Address = 192.168.180.94/27 Calculate the Network Address, the broadcast address and the host range. Host in Binary

11000000

10101000

10110100

01011110

Subnet Mask in Binary

11111111

11111111

11111111

11100000

Network in Binary

11000000

10101000

10110100

01000000

Network in Decimal

192

168

180

64

Broadca st addr. Bin

11000000

10101000

10110100

01011111

Broadcast addr. Dec

192

168

180

95

Subnet Mask in Decimal = 255.255.255.224 How many host bits? 5 So 2 5 =32 IP Addresses. (25 -2 = 30 Host) Host Address Range = 192.168.180.65 to 192.168.180.94

Question 1 Given a Host Address = 172.23.8.19 /21 Calculate the Network Address, the broadcast address and the host range. Host in Binary

10101100

00010111

00001000

00010011

Subnet Mask in Binary

11111111

11111111

11111000

00000000

Network in Binary

10101100

00010111

00001000

00000000

Network in Decimal

172

23

8

0

Broadcast addr. Bin

10101100

00010111

00001111

11111111

Broadcast addr. Dec

172

23

15

255

Subnet Mask in Decimal = 255.255.248.0 How many host bits? 11 So 2048 IP Addresses. ( 2046 Host Addresses) Host Address Range = 172.23.8.1 to 172.23.15.254

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Question 2 Given a Host Address = 147.252.238.20 255.255.240.0 Calculate the Network Address, the broadcast address and the host range. Host in Binary

10010011

11111100

11101110

00010100

Subnet Mask in Binary

11111111

11111111

11110000

00000000

Network in Binary

10010011

11111100

11100000

00000000

Network in Decimal

147

252

224

0

Broadcast addr. Bin

10010011

11111100

11101111

11111111

Broadcast addr. Dec

147

252

239

255

Network Prefix length = /20? How many host bits? 12 So 4096 IP Addresses. (4094 Host Addresses) Host Address Range = 147.252.224.1 to 147.252.239.254 Short questions Question: Which subnet does host 172.24.97.97/28 belong to? Answer: 172.24.97.96 Question: What is the last valid host on the subnetwork 92.168.184.96, with subnet mask: 255.255.255.240? Answer: 192.168.184.110 Question: How many subnets and hosts per subnet can you get from the network 172.27.0.0/16 using the subnet mask 255.255.255.192? Answer: 1024 subnets and 62 hosts Question: What valid host range is the IP address 192.168.107.64/25 a part of? Answer: 192.168.107.1 through to 192.168.107.126 Question: What is the last valid host on the subnetwork 72.17.225.128 using the subnet mask: 255.255.255.224? Answer: 72.17.225.158 Question: What is the first valid host on the subnetwork that the node 172.31.49.80 255.255.252.0 belongs to? Answer: 172.31.48.1 Question: Which subnet does host 172.16.73.16 255.255.240.0 belong to? Answer: 172.16.64.0 Question: What is the last valid host on the subnetwork 172.22.64.0/20? Answer: 172.22.79.254 Question: What is the last valid host on the subnetwork 192.168.236.0/26? Answer: 192.168.236.62

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