thanh phan cua NCP) Open: CDPCP, IPCP, loopback not set Keepalive set (10 sec) Last input 00:00:39, output 00:00:07, output hang never Last clearing of "show interface" counters 00:05:35 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/2/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 1158 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 70 packets input, 3698 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 72 packets output, 3176 bytes, 0 underruns 0 output errors, 0 collisions, 4 interface resets 5. PPP FRAME FORMAT -Flag: goi 1 truong co 01111110 bao bat dau gui Frame va ket thuc Frame -Address: -Control: -Protocol: 0021(Hex): Internet Pro 0029(Hex): AppleTalk 002B (Hex): Novell IPX 8021: Internet Protocol Control Protocol 8029: Appletalk Control Protocol 802B: Novell IPX Control Protocol C021: Link Control Protocol C023: Authencation Protocol -Data: -FCS: Khi mach khong co trao doi du lieu trong 1 khoang thoi gian thi mach se trao doi voi nhau nhung Idle Frames (La nhung bit 0, 1 roi rac) De tranh truong hop nham voi Data nguoi ta se them mot bit 0 vao sau bit thu 5 tinh tu ben phai qua 011111100.11011110.01111110
WIRELESS LAN 1. Gioi thieu: -Cung cap tinh co dong (Flexibility) uyen chuyen cho nguoi dung. - Mo rong cua LAN -Moi truong truy xuat CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) 2. Service Set Area: WLAN (giong Broadcast Domain trong LAN) :la tap trung tat ca cac Trang 116/201