Chap4 Transport Layer Study Questions

Chap4 Transport Layer Study Questions - CCNA Exploration...

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CCNA Exploration Chapter 4 OSI transport layer. Study questions. Answers are in white font. Think of your own answer first. Then highlight, change font colour and read the suggested answer. 4.1 In the source host, data comes to the transport layer from which layer? OSI session layer 5 or TCP/IP application layer. In the source host, data leaves the transport layer and goes to which layer? OSI network layer 3 or TCP/IP internet layer. What is the purpose of the transport layer? The Transport layer is responsible for the overall end-to-end transfer of application data. It encapsulates application data for transport, passing it to the network layer and it processes incoming data from the network layer, passing it to the application (or session) layer. What must the transport layer do with the segments that arrive at the destination host? Identify which segments belong together and reassemble them into a data stream, then direct the data stream to the correct application layer protocol. What does the transport layer use to identify the application layer protocol that produced the data on the source host and needs to process the data on the destination host? It uses port numbers. Why is there more than one transport layer protocol in regular use? Different types of application data have different requirements. Some types of data can tolerate some data loss or data in the wrong order, and other types of data cannot. Some types of data can tolerate delay and some cannot. Give an example of a type of data that can tolerate some delay but must arrive complete and in the right order. E-mail, web page. Give an example of a type of data that cannot tolerate delay, but can tolerate some loss or data. Phone conversation, streaming video. SW 8/29/2011 713bf528b88bfccc9a4272641bf543158fbf85a1.doc 1
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The transport layer carries out multiplexing. What does this mean? The transport layer splits the data into segments. Segments from different applications or conversations can be interleaved before being sent. If data from different conversations is multiplexed, how is the transport layer at the receiving host able to sort out the different conversations and reassemble the data? It uses port numbers.
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This note was uploaded on 08/29/2011 for the course NET 204 taught by Professor Na during the Spring '11 term at DeVry Irving.

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Chap4 Transport Layer Study Questions - CCNA Exploration...

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