Chapter 1 - Introduction to Computer Networks

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Questions 1) State whether the following network descriptions are describing a MAN, WAN or LAN: a. A network of users that share computer resources in a limited area - LAN b. A network of users that share computer resources across a metropolitan area - MAN c. A network that connects local area networks across a large geographic area - WAN 6) Define the term protocol It is set of rules established for users to exchange information. 7) Define the term topology It is architecture of a network 11) What is the difference between a hub and a switch? A Hub is less costing, less intelligent and less complicated than switch. Also, it is very simple job for sending out to the other computers from one port on the Hub. A switch is almost same than a Hub but it is most efficiently. It pays more attention to the traffic that comes across it. It can learn where particular address are. 12) What are the seven layers of the OSI model? Physical, Data link, Network, Transport, Session, Presentation and Application. 13) Which OSI layer is responsible for adding a header that includes routing information? Network 14) Which OSI layer is considered the media access control layer? Data Link 15) Which OSI layer combines messages or segments into packets? Transport 16) What layer does a router work at? Network 18) The OSI layer responsible for data compression and encryption is which layer? Presentation 19) TCP functions at which layer of the OSI model? Transport 20) HTTP functions at which layer of the OSI model? Application 21) IP and IPX are examples of protocols that operate in which layer of the OSI model? Network layer 23) Why are the layers of the OSI model important to the network administrator? Because the network administrator needs to understand better of all seven layers of the OSI model. Therefore, it can help to isolate the network problem as

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