1、廣域網(wǎng)技術(shù)介紹網(wǎng)絡(luò)技術(shù)基礎(chǔ)培訓(xùn)材料廣域網(wǎng)基于電信運營商的通信網(wǎng)絡(luò)設(shè)施建立遠程連接在相距遙遠的局域網(wǎng)之間建立連接性廣域網(wǎng)需求廣域網(wǎng) vs. 局域網(wǎng)廣域網(wǎng)和OSI參考模型廣域網(wǎng)鏈路選擇廣域網(wǎng)設(shè)備RoutersTerminal serversModemsDSU/CSUWAN networking devicesATM switchesFrame Relay switchesPSTN廣域網(wǎng)物理層DCEDTESSSSSSDTEDTEDCEDCE廣域網(wǎng)中的DTE和 DCEData Terminal Equipment連接到WAN的用戶側(cè)設(shè)備Data Communication EquipmentWAN服務(wù)

2、提供商的末端設(shè)備為DTE提供時鐘串行點對點連接廣域網(wǎng)數(shù)據(jù)鏈路層協(xié)議HDLCPPPFrame RelayHDLC 和 Cisco HDLCRouterX(config-if)# encapsulation hdlcEnables Cisco HDLC encapsulationUses the default encapsulation on synchronous serial interfaces配置 HDLC 封裝PPP PPP can carry packets from several protocol suites using NCP.PPP controls the setup o

3、f several link options using LCP.RouterX(config-if)# encapsulation pppEnables PPP encapsulation配置 PPP 封裝RouterX# show interface s0/0/0Serial0/0/0 is up, line protocol is up Hardware is HD64570 Internet address is 10.140.1.2/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 En

4、capsulation PPP, loopback not set, keepalive set (10 sec) LCP Open Open: IPCP, CDPCP Last input 00:00:05, output 00:00:05, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0

5、packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 38021 packets input, 5656110 bytes, 0 no buffer Received 23488 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 38097 packets output, 2135697 bytes, 0 underruns 0 output errors, 0 collisions, 6045 interface resets 0 output buffer failures, 0 output buffers swapped out