Ch7 IP - Internet Protocol (IP) Our greatest glory is not...

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Chapter 7 1 Internet Protocol (IP) Our greatest glory is not in never failing, but in rising up every time we fail. - Ralph Waldo Emerson
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Chapter 7 2 Objectives Explain how routers process IP packets in IP networks Describe the structure of the IP header and explain functions of header fields Explain the packet fragmentation process in IP and the re-assembly process Only Sec. 7.1 to 7.3 will be discussed.
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Chapter 7 3 Network Layer Protocols The primary function of a routed or routable Network layer protocol is to move datagrams through an internetwork connected by routers, with the originator as the source Network layer address, and the target as the destination Network layer address Internet Protocol is the routed or routable Network layer protocol used in the Internet protocol suite Widely used version is IP version 4 (IPv4) Internet Protocol version 6 (IPv6) is undergoing initial deployments
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Chapter 7 4 Sending IP Datagrams IP offers connectionless service with end-to-end Network layer addressing To build an IP datagram (or, an IP packet) and to send it on the physical medium, we must know the: IP addresses of the source and destination Hardware addresses of the source and recipient of the data link frame Source host needs to resolve a destination host name to an IP address. This is called the name resolution process
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Chapter 7 5 Destination host is local or remote? After determining the destination IP address, the source host compares the network portion of the destination address to its own local network address If they are the same, the destination is on the same local network. Otherwise, the destination is on a remote network
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Chapter 7 6 When the source and destination hosts are on the same network If the source host determines that the destination is local, it encapsulates the IP packet in a data link frame with destination host’s MAC address and sends this frame to the local network. Destination host on the local network accepts this frame, removes the data link header and trailer and forwards the IP packet to its network layer. A router does not get involved when the source and destination hosts are on the same network.
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Chapter 7 7 Example 2.3 In Figure 2.16, a host with physical address 10 sends a frame to a host with physical address 87. The two hosts are on the same LAN. At the data link level this frame contains physical (link) addresses in the header. These are the only addresses needed. The rest of the header contains other information needed at this level. The trailer usually contains extra bits needed for error detection.
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Chapter 7 8 Frame delivery using Physical (or, MAC) addresses at Data Link Layer Figure. 2.16 Data 87 10 1 packet discarded 2 packet discarded 3 packet accepted Data 87 10 4
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Chapter 7 9 When the destination host is remote. ..
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This note was uploaded on 06/13/2010 for the course CITX CITX 1150 taught by Professor P.whalen during the Fall '09 term at British Columbia Institute of Technology.

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Ch7 IP - Internet Protocol (IP) Our greatest glory is not...

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