EE5412 IP_Subnet1.doc

EE5412 Telecommunications Networks
IP_Subnet1.doc
[IP_Subnet1.doc]
Objective of address masking in router
Obtain network address and host address

To form subnets
Simplify routing table
Speed – improve router performance
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From IP address , network mask, network class, network address and host address can be obtained.

eg. IP address 144.214.112.55
Ans: class B network
144.214.0.0 network address
112.55 host address

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Subnet example –

IP address 214.146.231.70 /28. [ ie. Host address suffix has 4 bits.]

Find
1. network class
2. network mask
3. network address
4. subnet mask
5. subnet address.
6. host ID with in the subnet
7. broadcast address to the subnet


214 = 1101, 0110

70 = 0100, 0110 Subnet number Host number
240 = 1111, 0000 mask
64 = 0100, 0000 Subnet number
79 = 0100, 1111 Net Broadcast

Ans: class C network
Network mask 255.255.255.0
Network address 214.146.231.0

subnet mask 255.255.255.240
Subnet address 214.146.231.64
Host ID 6
Broadcast address 214.146.231.79
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