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2 C i s c o 8SRB/RSRB S R B S R S R B S R B S R BR S R BS R B I B M S R B C i s c o S R BR S R B D L S wd L S w 9 D L S w SRB C i s c os R B C i s c o WA N IBM SNAN e t B I O S S R B / R S R B C i s c o S R B / R S R B S R B / R S R B WA N I P SRB I B M S N A Network Basic Input Output Services, NetBIOSIBM SNA 80 N e t B I O S P C L A N S R B L A N R S R B L A N WA N S R B / R S R B I P S R B / R S R B S R B R S R B WA N C i s c o S R B S N AN e t B I O S RSRB C i s c o 3 S R B

3 8 SRB/RSRB 135 D i r e c t T C P Fast Sequenced Transport, FST S R B T C P S R B T C P I T C P S R B F S T S R B I P I F S T S R B S R B WAN C i s c o WA N 4 K B WA N T C P WA N S N A 3 R e c e i v e r- r e a d y R e c e i v e r- n o t - r e a d y F r a m e - r e j e c t I B M IBM 3745 S N A IBM 3174 C i s c o S N A WA N RSRB TCP/IP IP S R B / R S R B I P S R B S R B Cisco IOS S R Routing Information Field, RIF R I F S R B M A C M A C R I F M A C R I F WA N S N A M A C M A C R I F

4 136 Cisco M A C M A C D L S w NetBIOS N e t B I O S S R B / R S R B N e t B I O S Cisco IOS N e t B I O M A C R I F M A C R I FN e t B I O S N e t B I O S N e t B I O S n a m e _ q u e r y C i s c o N e t B I O S d a m p e n i n g I P WA N 8.2 SRB S R B C i s c o S R B 3745 WAN 8-1 Cisco SRB

5 8 SRB/RSRB 137 I B M S N A S R B 8-2 WAN 8-2 Cisco SRB C i s c o

6 138 Cisco S R B 8-3 S R B 3745 WAN 8-3 Cisco SRB

7 8 SRB/RSRB C i s c o SRB LAN virtual ring S R B L A N Cisco RSRB S R B R I F R1 3 WAN R Cisco 8-4 C i s c o WA N L A N A 1 L A N B 2S R B 3 A B R I F R i n g 1 - B r i d g e 1 - R i n g 3 - B r i d g e 2 - R i n g 2 R I F R i n g 3 R S R B L A NL A NS R B IEEE S R B multiport bridging L A N L A L A N L A N L A N

8 140 Cisco R S R B RSRB

9 8 SRB/RSRB S R B S R B C P U S R B SRB S R B

10 142 Cisco M A C M A C S R B R I F 8-8 F E P R S R B C P U S R B Cisco IOS 8.4 S R B Cisco IOS proxy explorer RIF 8-9

11 8 SRB/RSRB R I F R I F 8-9 A M A C B M A C M A R I F B B R I F M A C 8.5 NetBIOS N e t B I O S N e t B I O Network Basic End User Interface, NetBEUI N e t B I O S N e t B I O S C 000 N e t B I O S 0000 N e t B I O S 0080 N e t B I O S N e t B I O S N e t B I O S S R B NetBIOS N e t B I O S N e t B I O S 8-10 NetBIOS NAME-QUERY N e t B I O S M A C R I F A A N e t B I O S C A A ( ) 8-10 NetBIOS

12 144 Cisco D 12 A C A A A D A C D NetBIOS NAME-QUERY NetBIOS N e t B I O S NetBIOS NAME-QUERYN A M E - R E C O G N I Z E D N e t B I O S NetBIOS NetBIOS NAME-QUERY t h r o t t l i n g N e t B I O S 6N A M E - Q U E RY Cisco IOS 8-11 N e t B I O S 6NAME QUERY 3 1 NAME QUERY 8-11 NetBIOS NetBIOS N e t B I O S d a m p e n i n g C i s c o 8-12 C C 2 N e t B I O S 2 WA N

13 8 SRB/RSRB 145 CNAME QUERY( ) C WAN NetBIOS 8.6 SRB S R BR S R B R S R S R B 16 R S R B R S R WA N L A N R S R B T C PI P F S T R S R B 8-13 H D L C F D D I R S R B C P U 8-13 RSRB

14 146 Cisco TCP T C P R S R B R S R B S N A V TA M S N A T C P 8-14 L A N T C P R S R B C i s c o 16 IEEE T C P R S R B I P I P S N A S N A T C PI P C P U IEEE RSRB Cisco IEEE TCP TCP IP IP 8-14 RSRB TCP C i s c o I P R S R B IEEE RSRB Cisco IP 8-15 FSTRSRB

15 8 SRB/RSRB 147 C P U Fast Sequenced Transport, FST C P U F S T I P F S T L L C F S T F S T 8.7 WAN S R B S R B S R B WA N 8-16 WAN 8-16 WA N process switching f a s t s w i t c h i n g C P U T C P / I P C P U

16 148 Cisco C P U C i s c o Cisco cbus c b u s c b u b y p a s s C P U S R B I P F S T T C P T C P IP I P WA N I P I P R S R B R I P R I 4 I P I G R PE I G R P 4 M T U O S P F 4 I G R PE I G R PO S P F T C P R S R B F S T F S T I G R PE I G R P S N A T C P WA N S N A WA N S N A WA N WA N 50 WA N L L C WA N T C P / I P WA N S N A

17 8 SRB/RSRB WA N S R B WA N C P U F S T T C P / I P I G R PT C P / I P 64 K b p s T C P / I P F S T 8.8 IP SRB S R B S N A S N A S N A s S N S N A S N A Cisco IOS k e e p a l i v eh e l l o 10 s k e e p a l i v e k e e p a l i v e k e e p a l i v e 30 s k e e p a l i v e 3 s 79 s k e e p a l i v e F D D I F D D I F D D I F D D I F D D F D D I C S M A / C D k e e p a l i v e k e e p a l i v 10 s 10s keepalive s

18 150 Cisco IGRP I G R P d i s t a n c e - v e c t o r h o l d d o w n I G R P S R B I G R P 90 s 20 s I G R P 10 s 20 s 60 I G R P S N A EIGRP E I G R P I G R P I G R E I G R P OSPF O S P F k e e p a l i v e O S P F h e l l o O S P F d e a d O S P F O S P F O S P O S P F 40 s S N AN e t B I O S O S P F O S P Fh e l l o O S P F S R B 18 s h e l l o 6 s 8.9 S N A S N A Quality of Se r v i c e, Q o SCisco IOS Cl a s s - o f -Service, CoS S N AN e t B I O S priority queuing 4 S N A S N C P U custom queuing

19 8 SRB/RSRB k e e p a l i v e S N A R S R B S N A SAP S A P p r i o r i t i z a t i o n Destination Se r v i c e Ac c e s s Point, DSAP Source Service Access Point, SSAP R S R B S A P RSRB SAP R S R B S A P S A P0 4S N A S A P0 8 S N A LU SNA LU S N A S N A L U WAN SAP S A P WA N RSRB WA N e t B I O S L A N S A P S A P S A N e t B I O S N e t B I O S

Microsoft PowerPoint - 数据通信-ch1.ppt

Microsoft PowerPoint - 数据通信-ch1.ppt 主要内容与基本要求主要内容数据通信与计算机网络计算机网络的发展过程分类以及主要性能指标 ; 分组交换的基本原理及其与电路交换报文交换的联系与区别 ; 计算机网络的协议与体系结构第 1 章概述基本要求掌握分组交换电路