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1 2000, Cisco Systems, Inc. NTW 2000Network SecurityNetwork SecurityISOC NTW 2000ISOC NTW 20002 2000, Cisco Systems, Inc. NTW 200022000, Cisco Systems, Inc. IntroductionIntroduction3 2000, Cisco Systems, Inc. NTW 2000Network security ComponentsNetwork security Components4 2000, Cisco Systems, Inc. NTW 2000ISP ExampleISP Example. . .Customer SiteISP Management Plane. . .T1WWW DNS1Pub1TFTPDNS2Pub 2ISP Service PlaneForeignSiteInternet5 2000, Cisco Systems, Inc. NTW 2000Enterprise ExampleEnterprise ExampleProtectedNetworkEngineeringAdminF inanceDial-UpAccessBusinessPartnersDNSSe rverWWWServerInternet6 2000, Cisco Systems, Inc.

NTW 2000 © 2000, Cisco Systems, Inc. 1 Network Security ISOC NTW 2000

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