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Chapter 1: Questions 7, 14, and 17

7. How do local area networks (LANs) differ from metropolitan area networks (MANs), wide area networks (WANs), and backbone networks (BNs)?
LANs differ from other networks because they are small generally connecting a single building or floor and normally operate at 100 Mbps. Where BNs can connect all other types of networks together and can span hundreds of feet to several miles. BNs can also operate at 100 to 1,000 Mbps. MANs differ because they connect LANs and BNs in separate geographical locations to each other as well as to WANs. MANs are larger in size and span 3 to 30 miles that are slower in most cases where they operate at 64 Kbps to 100Mbps however new technologies have created much faster speeds in some areas at 10 Gbps. BNs and MANs are connected through WANs where they can span thousands of miles and are so large that space is generally leased due to cost and amounts of information that are able to be transferred. The transfer rates normally range from 64 Kbps to 10 Gbps.

14. Explain how a message is transmitted from one computer to another using layers?
Application Layer-A message is created through a web browser where the message is translated into a HTTP packet this HTTP packet is then placed into a TCP segment that contains HTTP and contains the message-Transport Layer. At this point the Network Layer – then uses Internet Protocol to select its destination for the message on the network; the IP contains the previous 2 layers packets and segments. From here the Data Link Layer- Places the IP packet into the Ethernet where it adds error checking information, and formats the message for start and stop markers. Then during the Physical Layer- The Ethernet sends the message through a network cable to the rest of the network containing the IP packet, which contains the TCP segment which contains the HTTP

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