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Data Communication & networking

This blog is for undergraduate/graduate students who require some basic information about their subjects or any other topic related to data communication.

Saturday, 2 April 2011

IP Address

IP ADDRESS:


An Internet Protocol address (IP address) is usually a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions:
  • Network address uniquely identifies the network.
  • Node/Host address uniquely identifies each machine.
The designers of the Internet Protocol defined an IP address as a 32-bit numberk nown as Internet Protocol Version 4 (IPv4), is still in use today. However, due to the enormous growth of the Internet and the predicted depletion of available addresses, a new addressing system (IPv6), using 128 bits for the address,was also developed.

Classes of IP Addressing
Class ‘A’ (1 - 126) ,used for data communication
Class ‘B’ (128 - 191) ,used for data communication
Class ‘C’ (192 - 223) ,used for data communication
Class ‘D’ (224 - 239) ,used for multi casting
Class ‘E’ (240 - 255) ,research and testing purposes

Class
Leading Address Bit
Range of first octet
Network ID format
Host ID format
Number of Networks
Number of Addresses
Subnet Mask
A
0
1-126
a
b.c.d
27 = 128
224 = 16777216
255.0.0.0
B
10
128-191
a.b
c.d
214 = 16384
216 = 65536
255.255.0.0
C
110
192-223
a.b.c
d
221 = 2097152
28 = 256
255.255.255.0


Subnetting

• To create subnetworks, take bits from host portion to network i.e. subnet
• Determine the required network ID
• Determine the host required per subnet
• One subnet mast for entire network
• Range of host ID
Default subnet mask is used to determine the part of host address in IP address

1 comment:

  1. An Internet Protocol address (IP address) is a numerical label assigned to each connection.The computer uses this to establish the connection.Two versions of the IP are in use: IP Version 4 and IP Version 6.In IPv4 an address consists of 32 bits and the IP v6 uses from 32 to 128 bits.IP address is of two types,Internal IP and an External IP.Internal IP is one that each device like computer,printer has.The external IP is the one through which one gets connected to the internet.The External IP is got from the ISP and is classified into static and dynamic where static IP does not tend to change and the dynamic IP varies each time the modem is switched ON and OFF.You can use Ip-details.com which displays your public/external IP.

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