As needs for both connectivity and security increase, it becomes necessary for organizations to build and manage secure Internet gateways.
IP is the internetworking protocol of today. Its use continues to grow. IP is the best-known protocol, it offers the user the best combination of services, and it is the protocol choosen by the main telecommunications carriers for their new services. IP is the essential protocol at this time, and thus we are concentrating on IP and ignoring other protocols. Effective security recommend the use of a single common routing protocol.
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