GTU
Exam Dec. - 2011
Subject:
Data Communication and Network Date:
07/12/2011
Question
-3 (b) 5 Mrks
What is IP Address? Explain different class of IP address and find the
class of following IP address:
192.168.1.5
Answer
IP address:
Internet
Protocol Address (or IP Address) is 32 bit an unique address that
computing devices use to identify itself and communicate with other devices in
the Internet Protocol network. Any device connected to the IP network must have
an unique IP address within its network.
Class of IP
address:
IP
addressing supports five different address classes: A, B,C, D, and E. Only
classes A, B, and C are available for commercial use.
From
|
To
|
|
Class – A
|
0.0.0.0
|
127.255.255.255
|
Class – B
|
128.0.0.0
|
191.255.255.255
|
Class – C
|
192.0.0.0
|
223.255.255.255
|
Class – D
|
224.0.0.0
|
239.255.255.255
|
Class - E
|
240.0.0.0
|
255.255.255.255
|
•
Class A
–
In class-A first number is network Id (N.H.H.H).For
example in IP address: 4.22.145.90
number - 4 is network Id.
–
In class-A 0 not be used as Net ID.
–
In class-A total 126 different network generate
from 1-126.
–
127 is reserved for loop back functions.
–
Total 16,777,214 Hosts per one network and total
126 x 16,777,214 host in class – A.
•
Class B
–
In class-B first two numbers is network Id (N.N.H.H).
For example in IP address: 129.6.8.4
number – 129.4 is network Id.
–
The rang of class – B is 128-191.
–
The first IP Address is the NET ID.
–
The last IP Address is the Broadcast Address
–
In class – B 16,384 Different Networks
–
Total 65543 Hosts per one network
•
Class C
–
In class-C first three numbers is network Id
and last is hostid(N.N.N.H). For example in IP address: 197.76.9.23 number – 197.76.9 is network
Id.
–
The rang of Class – C is 192-223
–
The first IP Address is the NET ID
–
The last IP Address is the Broadcast Address
–
In class – C 2,097,152 Different Networks
–
254 Hosts per Network
•
CLASS D – Used for multicast broadcasts
- CLASS E – Experimental addresses not available to the public
IP address: 192.168.1.5 is in Class – C because
first number 192 in range of class – C.
Note: This also topic-1 of Chapter-7
