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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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dates are sent every 60 seconds Inverse ARP updates every 60 seconds Frame Relay Serial CDP packet every 60 seconds CDP hold time is 180 seconds IGRP Sends regular routing update every 90 Seconds IGRP Admin distance 100 RIP Admin distance 120 Update Timers 90 second updates Hold-Down Timer 190 seconds Protocols within an AS OSPF VLSM (Variable Length Subnet Mask) EIGRP IGRP 3 types of routes: (they use D-V and hop counts) Interior System Exterior **This was on my test for sure** Protocol Network Address Node Address Novell IPX ********* 32 bits; (hex) refers to the media (total 32+48=80 bits) 48 bits; (hex) usually the MAC address of a LAN interface IP Address 32 bit mask IP to MAC address MAC Address 6 bytes and 48 bits AppleTalk 16 bits (dec); refers to one or one to many nets in cable on media 8 bits added to network number; usually dynamically assigned on LAN X.25 or X.121 4 (dec) digits of DNIC 2 or 3 digit data county code and I network digit 10 or 11 digits of network terminal number; usually assigned by Wan Service provider Hw to setup an ISDN/PRI Interface on Cisco 7500 Isdn switch-type switch-type Cisco LMI type: Cisco How many frame types are with Cisco Routers Cisco IETF How many LMI types are available? CISCO ANSI Q.933a ISDN BRI Support: Connect to lines with SPIDs (service Profile Identifiers) (phone numbers) BRI: Basic Rate Interface:2 (64B) + 1 (16D) B = 64kbs, D=16Kbps = 128kbs plus control PRI: Primary Rate Interface: 23B + 1 (64D) Total of 1.544Mbps ISDN protocol codes: E: existing telephone line I: concepts, terms, and services Q: switching and signaling and call setup and tear down D Channel protocol carries signaling information (call setup) to control calls on B channels at the user network interface. Traffic over the D channel employs the LAPD data link level protocol. The D channel deals with physical, datalink, network, signaling and control B Channel is a data channel (56k or 64K). It is used for digitized speech transmission or for relativel
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