This document discusses internet addressing and data streams. It begins by explaining that sockets need a unique address in the form of an IP address and port number to communicate with other sockets. It then defines IP as the Internet Protocol and explains that IP addresses are unique identifiers used for communication between two points on a network. IPv4 addresses have 32 bits but IPv4 addressing is running out, and IPv6 was created as a solution. The document also discusses how internet addressing is handled in Java using the InetAddress class and provides examples of methods like getHostName(), getHostAddress(), getLocalHost(), and getByName().

1. CHAPTER 2 :
Internet Addressing & Data Stream
By :
Mr. Asyran Zarizi Bin Abdullah

2. Socket Programming
• Socket is a IPC (Inter Process Communication)
facility for network application.
• To make socket communicate with other
socket, so it need unique address as a
identifier.
• Socket Address contain IP Address and Port
Number. Example : 192.168.20.12 : 8080
IP Address Port Number

3. What is IP ?

4. W2-1-2, Kuates Staff
Politeknik Muadzam Shah,
26700, Pahang D.M
W2-1-2, Kuates Staff
Politeknik Muadzam
Shah,
26700, Pahang D.M
PC A
(Source)
PC B
(Destination)
172.168.2.3 10.10.10.34
An Analogy

5. HERE WE KNOW THE IMPORTANT IS…

6. Internet Addressing
• IP is stand for Internet Protocol.
• IP is an unique ID.
• It use for communicate between 1 point to
another point in network.
• Public & Private
• IPv4 has 32 bits , example : 192.168.32.12
but IP Address is running out….

7. Quiz :
What is the solution for
ipv4 issues?

8. Quiz :
What is the solution for
ipv4 issues?
Answer : ipv6

10. What is this??

11. This is IPV4 

12. 4,294,672,96

14. 340,282,366,920,938,463,463,
374,607,431,768,211,456

15. 340 Undecillion!!!

22. Internet Addressing in JAVA
• Java is a capable programming language that is
capable to support networked environment
which support most popular protocol available
• Java API that support internet addressing is :-
– InetAddress
• There are two subclasses under it
– Inet4Address
– Inet6Address
– An InetAddress object is capable to store IP address or
Domain name which later used for communication
address or translation between the form available.

23. IP Addresses & Hostname
• Java.net.InetAddress class
– Represents a single IP Address
– Performs transparent DNS lookups
• Java.net.UnknownHostException class
– Thrown if DNS system can`t find IP address for
specific host

24. InetAddress class
• Creating an InetAddress object is as follow:-
• Some of the useful methods within InetAddress class
– getHostName()
• It return the host domain name in String format
– getHostAddress()
• It return the IP address in String format
– getLocalHost()
• It return InetAddress object with local computer address information
with its host name
– getByName()
• It return InetAddress object of a destination computer containing its
address and host name

25. getByName example

26. getHostName example

27. getHostAddress example

28. getLocalHost example

29. Socket & Protocol