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An overview of instant messaging (im) security and firewalls. It covers the different types of im systems, their vulnerabilities, and the role of firewalls in securing im communications. Topics include im authentication, peer-to-peer vs. Peer-to-network models, im port usage, and various firewall types such as nat, packet filtering, proxy servers, and stateful packet inspection.
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that time
models
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fully aware of application states
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Internet
Firewall
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Public Server
PC
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Private Server
DMZ
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