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Overlay Extranets • Pros Takes advantage of installed Internet connection (Usually) No new hardware, software configuration only • Cons No control over data routing No control over quality of service Security concerns 1405 1082_06F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 68 34 Overlay Extranets— Managed Service • Pros Service Level Agreements Quality of Service Network management • Cons Limited to service offering Perceived security issues 1405 1082_06F9_c3 69 © 1999, Cisco Systems, Inc.

99 1405 1082_06F9_c3 © 1999, Cisco Systems, Inc. 100 Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

Printed in USA. scr 64 32 Service Provider Extranets ISP A Internet • Many Service Providers offer VPN or Extranet services • Commitment to Service Level and QoS 1405 1082_06F9_c3 65 © 1999, Cisco Systems, Inc. 7% Packet Loss <1% Firewall Updates Within 24 Hrs. after Cert. Alert Acme ISP promises that if it abrogates any of these committed service levels, it owes Big International Corporation a refund of one full month’s charges. Signed: Source: Forrester Research 1405 1082_06F9_c3 © 1999, Cisco Systems, Inc.

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