[Chrisangel29]

Could someone please explain me the bold part ?

The “connection” between the programs is drawn as a “tube” or “pipe”.
This is because the type of connection used by nearly all network applications is like that.
As an alternative it is possible to send individual messages (called datagrams) over the
network but usually a bi-directional connection is made along which any data can be sent.

[tlhIn`toq]

That's a ton of explanation that I'm sure exists in the book where you got *that* part from.

What exactly don't you understand? What a datagram is? What does bi-directional mean?

[Chrisangel29]

tlhIn`toq, on 09 February 2013 - 09:43 AM, said:

That's a ton of explanation that I'm sure exists in the book where you got *that* part from.

What exactly don't you understand? What a datagram is? What does bi-directional mean?

There are just notes i dont have a book..
My english sucks so i cant understand..if we have to use a bi-directional connection for sending datagrams?

[Lemur]

Look into and meditate on: UDP, TCP/IP, Duplex Transmissions

[raghav.naganathan]

Well, here is something to simplify your answer...

Think of a radio...you can only receive the incoming frequencies...that is a unidirectional connection.

Now, think of a mobile phone...you can not only receive, but also send data...that is a bi-directional connection.

The 'pipe' in your question acts as a bi-directional connection, most of the time, sending data as well as receiving data...but sometimes, it will act as a unidirectional connection, where it only sends the packets of data over the network.

regards,
Raghav