Laboratory 6 - Practical work 7 Study of network IP Aim...

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Guide To Computer Forensics and Investigations
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Chapter 10 / Exercise 5
Guide To Computer Forensics and Investigations
Nelson/Phillips
Expert Verified
Practical work 7 Study of network IP Aim: Study of network IP • Classification of IP address • Sub netting • Super netting Each Network Interface Card ( NIC or Network card ) present in a PC is assigned one Network address called as IP address. This IP address is assigned by the administrator of the network. No two PCs can have the same IP address. There is a burned-in address on the NIC called as Physical Address [or MAC ]. The MAC address of a network card indicates the vendor of that card and a unique serial number. Format of IP address IPv4 is made up of four parts, in the pattern as w.x.y.z. Each part has 8 binary bits and the values in decimal can range from 0 to 255. For example: 31.223.182.162 IP address classes IP addresses are divided into different classes. These classes determine the maximum number of hosts per network ID. Only three classes are actually used for network connectivity. The following table lists all of the address class. Grouping of IP addresses into different classes: A, B, C, D, and E.
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Guide To Computer Forensics and Investigations
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Chapter 10 / Exercise 5
Guide To Computer Forensics and Investigations
Nelson/Phillips
Expert Verified
Class A: first bit in part w is 0 and others can be anything 0 000 0001: 1 0 111 1110: 126 First 8 bits are used for network part and the remaining for host part. Class B: First two bits in w are 10 , and others can be anything 10 00 0000: 128 10 11 1111: 191 First 16 bits are used for network part and the remaining for host part Class C: first three bits in w are 110 , and others can be anything 110 0 0000: 128 110 1 1111: 223 First 24 bits are used for network part and last 8 bits for host part. Class D: first four bits in w are 1110 , and others can be anything; used for multicast. 1110 0000: 224 1110 1111: 239 Class E: future use or experimental purposes. Default Subnet mask
It is used to identify the network part from the host part. Put binary one for the parts that represent network part and zero for the part that represent host part. Invalid IP address a) If the network part is all 0s, the address belongs to class A. But this is an invalid ip address because for an ip address all the network or host part should not be all 1s or all 0s.

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