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Nt1310 Unit 1 Assignment

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Homework 2 (due 12:40pm, Mon., 9/18)

a) Review questions: R17, R23 in Chapter 1.
R17)

R23) What are the five layers of Internet protocol stack?
Application, Transport, Network, Link, Physical

What are the principal responsibilities of each of these layers?
Application Layer- Packets referred to as messages. This is where network applications and their application-layer protocols reside such as: HTTP, SMTP, FTP. See page 50 of book.
Transport Layer- Packets referred to as segments. Transports app-layer messages between app endpoints. TCP and UDP. See page 51 of book.
Network Layer- Packets referred to as datagrams. Responsible for moving datagrams from one host to another. The transport protocol sends segment and destination address. The network layer provides delivery of the segment to the transport layer of the destination host. See page 51 of book. …show more content…
Examples of Link layer protocols: Ethernet, Wifi, and cable access networks DOCSIS. The network layer routes a datagram through as series of routers between the source and destination. The network layer passes the datagram down to the link layer, which delivers the datagram to the next node (host or router) and then passes the datagram up to the network layer. See pages 51 and 52 of book.
Physical Layer- Moves the individual bits within the frame from one node to the next. It is link dependent and depend on the transmission medium being used. i.e. twisted pair copper wire, single mode fiber optics. See page 52 of

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