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Study Guide Chap 1

Management of internet domain names and addresses up

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management of Internet domain names and addresses up until October 1998 ICANN- (Internet Corporation for Assigned Names and Numbers) After October 1998 ICANN took over the responsibilities of IANA. They are a nonprofit corporation managed by an international board NIC- (network information center) responsible for collecting and distributing information about TCP/IP protocols Questions 1. List the 5 layers in the TCP/IP model. What is the job of each layer? a. Application, Transport, Network, Data-link, and Physical. i. Application layer- the logical connection, from end-to-end, between the two application layers. Messages get sent between the layers as if there was a bridge between them. Includes many different protocols. Used to transfer things from one computer to another. ii. Transport layer- takes the message from the application layer in a transport layer packet (segment or a user datagram) and sends it through a logical connection to the transport layer. It is responsible for the services, which get a message from the transport layer to the running application program on the designated host. iii. Network layer- this layers is responsible for creating a connection between the source computer and the destination computer. The communication is host-to-host. It has to choose the best path for each given packet. iv. Data-link layer- Responsible for the node-to-node delivery. After the best link to transfer the packet is chosen this layer is responsible for taking the datagram across/through the link. Takes a datagram and encapsulates it in a packet called a frame. There is no specific protocol for this layer. v. Physical layer- this layer is responsible for carrying the individual bits in a frame across the link. There is a hidden transmission layer under the
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CSIT 220 Study Guide Chapter 1 Fall 2011 Forouzan Text physical layer. This carries the electrical or optical signals not the bit. The combination of the two physical layers transmits a bit. 2. How do the TCP/IP Layers map to the OSI Model?
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