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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:23 发布人：wongrs | |
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CC33.0452 AABB0001 is the network number 00001B03ACC33 is the node address 0452 is the socket number Destination 10.4.0.6 = Network layer header Source 00.00.OB. A4.26.39 Data link header Destination port 20 Transport layer header 0.0.8.64 is the host number Fragmentation: Is a process that occurs on a router somewhere between the source and destination? This process segments the datagrams into a convenient size into a single frame for transport over the network. Poison Reverse Poison reverse updates are sent to remove a route and to place it in holddown. Holddowns Are used to prevent regular update messages from inappropriately reinstating a route that may have gone bad. It prevents temporary routing loops while convergence takes place. A newly learned route is used until the holddown time expires. Split Horizon Derive from the fact that it is not useful to send information about a route back in the direction from which it came. Cut Through LAN switch copies only the destination address into its onboard buffers. A cut through switch provides reduced latency because it begins to forward the frame as soon as it reads the destination address and determines the out going interface. Store and Forward: Has a variable delay because of packet size and waits for the packet to be fully received before forwarding it. It copies the entire frame into its onboard buffers and computes the cyclic redundancy check CRC IGRP Metric includes: Bandwidth, Delay, Reliability, Loading, MTU Interface ethernet 0.1 (Indicates the first subinterface on interface E0) Interface ethernet 0.2 (indicates the second subinterface on interface E0) Dialer list is used to filter what traffic is interesting PRI circuit types: E1 uses CRC4 or no CRC4 T1 uses SF or ESF Three basic methods used in networking Buffering: Buffering is used by network devices to temporarily store bursts of excess data in memory until they can be processed. Occasional data bursts are easily handled by buffering. However, excess data bursts can exhaust memory, forcing the device to discard any additional datagrams that arrive. Source Quench: Source quench messages are used by receiving devices to help prevent
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