chapter 15 connecting lans, backbone networks, and …plw/dccn/presentation/ch15.pdf · connecting...
TRANSCRIPT
![Page 1: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/1.jpg)
Chapter 15
Connecting LANs, Backbone Networks,
and Virtual LANsand Virtual LANs
15.1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
![Page 2: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/2.jpg)
1515--1 1 CONNECTING DEVICESCONNECTING DEVICES
InIn thisthis section,section, wewe dividedivide connectingconnecting devicesdevices intointo fivefivedifferentdifferent categoriescategories basedbased onon thethe layerlayer inin whichwhich theytheyoperateoperate inin aa networknetwork..
Topics discussed in this sectionTopics discussed in this sectionPassive HubsActive Hubs
Topics discussed in this section:Topics discussed in this section:
Active HubsBridgesTwo-Layer SwitchesyRoutersThree-Layer Switches
15.2
Gateways
![Page 3: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/3.jpg)
Figure 15.1 Five categories of connecting devices
15.3
![Page 4: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/4.jpg)
Figure 15.2 A repeater connecting two segments of a LAN
15.4
![Page 5: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/5.jpg)
Note
A repeater connects segments of a LAN.
15.5
![Page 6: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/6.jpg)
Note
A repeater forwards every frame; it has no filtering capabilityit has no filtering capability.
15.6
![Page 7: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/7.jpg)
Note
A repeater is a regenerator, not an amplifiernot an amplifier.
15.7
![Page 8: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/8.jpg)
Figure 15.3 Function of a repeater
15.8
![Page 9: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/9.jpg)
Figure 15.4 A hierarchy of hubs
15.9
![Page 10: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/10.jpg)
Note
A bridge has a table used in filtering decisionsfiltering decisions.
15.10
![Page 11: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/11.jpg)
Figure 15.5 A bridge connecting two LANs
15.11
![Page 12: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/12.jpg)
Note
A bridge does not change the physical (MAC) addresses in a frame(MAC) addresses in a frame.
15.12
![Page 13: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/13.jpg)
Figure 15.6 A learning bridge and the process of learning
15.13
![Page 14: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/14.jpg)
Figure 15.7 Loop problem in a learning bridge
15.14
![Page 15: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/15.jpg)
Figure 15.8 A system of connected LANs and its graph representation
15.15
![Page 16: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/16.jpg)
Figure 15.9 Finding the shortest paths and the spanning tree in a system of bridges
15.16
![Page 17: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/17.jpg)
Figure 15.10 Forwarding and blocking ports after using spanning tree algorithm
15.17
![Page 18: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/18.jpg)
Figure 15.11 Routers connecting independent LANs and WANs
15.18
![Page 19: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/19.jpg)
1515--2 2 BACKBONE NETWORKSBACKBONE NETWORKS
AA b kbb kb kk llll ll LANLAN bbAA backbonebackbone networknetwork allowsallows severalseveral LANsLANs toto bebeconnectedconnected.. InIn aa backbonebackbone network,network, nono stationstation isisdi ldi l dd hh b kbb kb hh iidirectlydirectly connectedconnected toto thethe backbonebackbone;; thethe stationsstations arearepartpart ofof aa LAN,LAN, andand thethe backbonebackbone connectsconnects thethe LANsLANs..
Bus BackboneTopics discussed in this section:Topics discussed in this section:
Star BackboneConnecting Remote LANs
15.19
![Page 20: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/20.jpg)
Note
In a bus backbone, the topology of the backbone is a busof the backbone is a bus.
15.20
![Page 21: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/21.jpg)
Figure 15.12 Bus backboneg
15.21
![Page 22: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/22.jpg)
Note
In a star backbone, the topology of the backbone is a star;backbone is a star;
the backbone is just one switch.
15.22
![Page 23: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/23.jpg)
Figure 15.13 Star backbone
15.23
![Page 24: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/24.jpg)
Figure 15.14 Connecting remote LANs with bridges
15.24
![Page 25: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/25.jpg)
Note
A point-to-point link acts as a LAN in a remote backbone connected byremote backbone connected by
remote bridges.
15.25
![Page 26: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/26.jpg)
1515--3 3 VIRTUAL LANsVIRTUAL LANs
WeWe cancan roughlyroughly definedefine aa virtualvirtual locallocal areaarea networknetwork(VLAN)(VLAN) asas aa locallocal areaarea networknetwork configuredconfigured bybysoftware,software, notnot byby physicalphysical wiringwiring..
Topics discussed in this section:Topics discussed in this section:MembershipConfiguration
Topics discussed in this section:Topics discussed in this section:
ConfigurationCommunication between SwitchesIEEE Standard
15.26
Advantages
![Page 27: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/27.jpg)
Figure 15.15 A switch connecting three LANs
15.27
![Page 28: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/28.jpg)
Figure 15.16 A switch using VLAN software
15.28
![Page 29: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/29.jpg)
Figure 15.17 Two switches in a backbone using VLAN software
15.29
![Page 30: Chapter 15 Connecting LANs, Backbone Networks, and …plw/dccn/presentation/ch15.pdf · Connecting LANs, Backbone Networks, and Virtual LANsand Virtual LANs ... 1515--1 1 CONNECTING](https://reader036.vdocuments.us/reader036/viewer/2022081802/5acbf3897f8b9a27628bef25/html5/thumbnails/30.jpg)
Note
VLANs create broadcast domains.
15.30