Comments
The transport layer is possibly the most important layer for exam study purposes. A lot is going on here, and it is heavily tested.
The transport layer deals with exactly how two hosts are going to send data. The two main methods are called connection-oriented and connectionless. Connection-oriented transmission is said to be reliable, and connectionless is unreliable. Every network protocol stack will have a protocol that handles each style; in the TCP/IP stack, reliable transmission is done by TCP, and unreliable by UDP. Now, don't get too wrapped up in the term "unreliable"; this doesn't mean that the data isn't going to get there; it only means that it isn't guaranteed to get there.
Think of your options when you are sending a letter: you can pop it in an envelope, throw a stamp on it and put it in the mailbox, and chances are good that it will get where it's supposed to go—but there is no guarantee, and stuff does go missing once in a while. On the other hand, it's cheap.
Your other choice is to use a courier—FedEx's motto used to be, "When it absolutely, positively has to be there overnight." For this level of service, you have to buy a fancy envelope and put a bunch of extra labels on it to track where it is going and where it has been. But, you get a receipt when it is delivered, you are guaranteed delivery, and you can keep track of whether your shipment got to its destination. All of this costs you more—but it is reliable!
This analogy works perfectly when describing the difference between UDP and TCP: UDP is the post office, and TCP is FedEx. Let's look at this more closely, starting with TCP.
Posted by crouse
This layer provides transparent transfer of data between two nodes.
Posted by sagitraz
The transport layer deals with exactly how two hosts are going to send data. The two main methods are called connection-oriented and connectionless. Connection-oriented transmission is said to be reliable, and connectionless is unreliable. Every network protocol stack will have a protocol that handles each style; in the TCP/IP stack, reliable transmission is done by TCP, and unreliable by UDP.
Posted by waqqas1
The transport layer is possibly the most important layer for exam study purposes. A lot is going on here, and it is heavily tested.
The transport layer deals with exactly how two hosts are going to send data. The two main methods are called connection-oriented and connectionless. Connection-oriented transmission is said to be reliable, and connectionless is unreliable. Every network protocol stack will have a protocol that handles each style; in the TCP/IP stack, reliable transmission is done by TCP, and unreliable by UDP. Now, don't get too wrapped up in the term "unreliable"; this doesn't mean that the data isn't going to get there; it only means that it isn't guaranteed to get there.
Think of your options when you are sending a letter: you can pop it in an envelope, throw a stamp on it and put it in the mailbox, and chances are good that it will get where it's supposed to go—but there is no guarantee, and stuff does go missing once in a while. On the other hand, it's cheap.
Your other choice is to use a courier—FedEx's motto used to be, "When it absolutely, positively has to be there overnight." For this level of service, you have to buy a fancy envelope and put a bunch of extra labels on it to track where it is going and where it has been. But, you get a receipt when it is delivered, you are guaranteed delivery, and you can keep track of whether your shipment got to its destination. All of this costs you more—but it is reliable!
This analogy works perfectly when describing the difference between UDP and TCP: UDP is the post office, and TCP is FedEx. Let's look at this more closely, starting with TCP.
Posted by AbramianDaniel
en.wikipedia.org/wiki/OSI_model - 78k
Posted by crouse
Transport layer provide end to end control
& for more info:
http://net.lrc-hueuni.edu.vn/file.php/2/Slides_of_Semester_1/Exploration_Network_Chapter4.ppt
Posted by Hash007
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