Packet 1

 

 

 

Internet - Transmission Protocols

Internet transmission protocols


We will look at the following transmission protocols:
•   TCP/IP
•   IP address.

TCP/IP (Transmission Control Protocol/Internet Protocol)


TCP/IP is the recognised transmission protocol for all Internet transmission. TCP/IP is not a single protocol but a set of protocols, all doing different tasks.

TCP allows data to be sent over networks.  TCP divides a message into blocks of data, called packets, with packet numbers: IP provides routing devices – special electronic switches – with the source and destination web addresses, which are used to connect the Internet user with the web server. The routing device then forwards the packets to the destination address.
Message

 

 

Packet 4
Packet 2

 

 

IP provides routing devices – special electronic switches – with the source and destination web addresses, which are used to connect the Internet user with the web server. The routing device then forwards the packets to the destination address.

source address
destination address
packet 1
source address
destination address
packet 2
source address
destinatio address
packet 3
source address
destination address
packet 4

 

 

 

 

Advantages of TCP/IP

Industrial standard – allows different computers and networks to communicate transparently. The user should not be aware of the type or size of the network that they are communicating with.

Routable – IP packets can be passed through a number of routing devices until they find their destination.

Robust – used for many years and well documented.

Scalable – can be used on any size of network (WAN or LAN)

IP address


The Internet connects millions of different network hardware components together. Each component is referred to as a host. The host is identified on the Internet by having a unique identification number.


Each host – computer, router, printer, etc – is identified by a unique Internet Protocol Address, or IP address.


An IP address appears as a dotted decimal number.

 

 

10.120.10.60

 

 

10.120.10.65

 

If you know it, you can enter the IP address of any host directly into the address bar in your browser window.

Find out more about IP addressing - click here.

Find out more about packet swtiching - click here.

Download and complete Worksheet 3.

Watch the movie Warriors of the Internet.

 

 

 

 

 



 

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