HW8_solution

HW8_solution - Polytechnic University, Dept. Electrical and...

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Polytechnic University, Dept. Electrical and Computer Engineering EE4414 Multimedia Communication System II Fall 2005, Yao Wang ___________________________________________________________________________________ Homework 8 Solution (Networking - Basics) 1. What are the four major components that constitute the Internet? The computers (or hosts) at the network edge, the routers at the network core, the transmission media that link the computers and routers, and the protocols that govern the data transport among computers through the routers. 2. What are the five protocol layers of the Internet? What are their primary functions? The five layers are application, transport, network, link, and physical. The application layer protocols govern the client-server interactions among hosts in different applications. Different application layer protocols have been established for different applications. The transport layer protocols govern the transfer of data from one host to another in any particular application. There are two types of transport layer protocols, TCP and UDP. TCP is for connection-oriented data transfer, governs session set-up, error control, flow control, and congestion control. The UDP protocol is for connection-less data transfer, and merely adds a port number to the payload data. The network layer primarily performs network packet routing following different routing protocols. It also performs packet fragmentation when necessary subject to a maximum packet size, and error control at the network layer. The link layer refers to data transfer over individual links in a chosen route and it has corresponding protocols governing link layer error control. The physical layer refers to the actual transmission media (fibers, cables, wireless, etc) and various functions at that layer. 3. What is connectionless service? What is connection oriented service? With connectionless service, data are sent from a source to a destination without establishing a connection in advance, (i.e. no acknowledgement from the destination that it is ready and willing to accept the data). The sender does not attempt to monitor whether the data are delivered to the destination. With connection oriented service, a connection between the sender and destination is first established through a handshaking process (i.e., the sender does not send until it knows that the destination is ready to receive the data). Only
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This note was uploaded on 01/22/2012 for the course EE 4414 taught by Professor Wang during the Fall '07 term at NYU Poly.

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HW8_solution - Polytechnic University, Dept. Electrical and...

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