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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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router to reduce the rate at which it is sending packets. CDP Cisco Discovery Protocol: Provides a single proprietary command that enables network administrators to access a summary of the multiple protocols and address configured on other directly connected routers. Half Duplex The circuits are receive RX transmit TX and collision detection. When half duplex Ethernet is implemented, TX circuit is active at the transmitting station. When another station is transmitting, the station's RX circuit is active. Logically, these circuits feed into a single cable creating a situation similar to the narrow one bridge analogy. Full Duplex Uses only point-to point connections Allows simultaneous transmission and reception of packets on two pair of wires. Convergence: Routers have a consistent view of an internetwork topology Startup sequence Bootstrap from Rom Cisco IOS from Flash From tftp From Rom Configuration File from NVRAM From tftp server From console Configuring Access List: If it has a -if then it is for an interface Like (config-if) it is makes it an interface If is just plain then it just Global Like (config) Beacon Frame: When a node determines that no tokens have been received from its NAUN, it initiate a beacon frame to notify the ring of an open cable.
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