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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:00 发布人：wongrs | |
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7 net 16777214 nodes (3)224-6-2097150-8190-30 Class B Net.Net.Node.Node 10 128-191 16384 net 65534 nodes (4)240-14-1048574-4094-14 Class C Net.Net.Net.Node 110 192-223 2097152 net 254 nodes (5)248-30-524286-2046-6 (net/node all 0-this net/node, all 1-all net/node) (127-loopback add ) (6)252-62-262142-1022-2 (entire IP all 0-cisco default route, all 1-broadcast to all nodes) (7)254-126-131070-510-na Max # of Subnets: 2(masked bits)-2, Max # of Hosts / subnet : 2(unmasked bits)-2 (8)255-254-65534-254-na Class D-224-239-Multicasts, Class E- 240-255-Future. Directed / only subnet broadcast add- 172.16.3.255, Flooding / total Network broadcast add- 172.16.255.255 Cisco Routers : 2500 : Cons port- async serial port RJ45 60 Pins, Aux port- Modem RJ45,Telnet port - Ethernet 0, (S0,S1-serial port), External ports - TFTP server, Virtual Term, Net Mngmt Stns. ROM-holds Bootstrap Startup programs, OS software, POST. Flash-EEPROM-holds cisco IOS image and Microcode, RAM-holds running OS, running config, provides caching & pkt filtering. NVRAM-Stores startup config, config mem: executes NVRAM commands, copies start to Run, config net [ip add of tftp serv]: load config info from TFTP server, Config t: console / telnet (config from my term) Catalyst 5000 : to config port, type slot/port (e 4/2 for Ethernet, card 4, port 2), Catalyst 7000 / 7500 VIP (versatile int processor cards): type slot/port adapter/port; e 2/0/1, 3 rd Enet vip card3, first port 0, 2 nd Enet Int. Auto Install : config router autoly and remotely. New router acts as BootP work stn & gets IP from existing router acts as BootP or RARP server, connects to TFTP server, gets network-config, hostname-config/router-config files. BootP server: provides (by TFTP) stn.IP add, server IP add and the name of the file to be loaded and booted. Modes: User EXEC : After log in, you are automly in this mode, basic tests, temp term setup, conn to remote devices (router>), logout to exit, Privileged EXEC: Set OS params, config, debug,(router#) Quit/Exit to exec mode, ROM monitor: Occurs when no cisco IOS image found / boot interrupt (rommon>), Set up: occurs on first switch on, RxBoot : reboot from ext (router
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