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The transport layer is also the place in the layer stack where functions are normally included to add features to end-to-end data transport. Where network layer protocols are normally concerned with just "best effort" Communications, where delivery is not guaranteed. Transport layer protocols are given intelligence in the form of algorithms that ensure that reliable and efficient communication between devices takes place. This encompasses several related jobs, including lost transmission detection and handling, and managing the ratę at which data is sent to ensure that the receiving device is not overwhelmed.

Transmission ąuality, meaning ensuring that transmissions are received as sent, is so important that some networking references define the transport layer on the basis of reliability and flow-control functions. However, not all transport layer protocols provide these services. Just as a protocol suitę may have a connection-oriented and a connectionless transport layer protocol, it may also have one that provides reliability and data management services, and one that does not. Again, this is the case with TCP/IP: there is one main transport layer protocol; TCP, that includes reliability and flow control features, and a second, UDP, that doesn't.

QUESTION NO: 6

At which OSI layer is a logical path created between two host systems named TK1 and TK2 on the TestKing LAN?

A.    Physical

B.    Session

C.    Data link

D.    Transport

E.    Network

F.    Application

G.    Presentation

Answer: E

QUESTION NO: 7

Which OSI layer is associated with the following: The acknowledgement of transmissions, sequencing, and flow control across a network?

A.    Layer 2

B.    Layer 3

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