proxies(完整版)
【正文】 forwarding devices especially routers to drop certain packets ? Consider example: Packet filtering ? Suppose is test work and has controlling workstations ? Install filter to allow packets only from to ? Keeps potentially bad packets away from remainder of Inter Inter firewall ? Packet filter at edge of intra can disallow unauthorized packets ? Restricts external packets to just a few internal hosts Firewalls ? Proxies forward packets through firewall after authorization. – A puter and associated software which will pass on a request for a URL from a browser to an outside server and return the results. – This provides clients that are sealed off from the Inter a trusted agent that can access the Inter on their behalf. – Once the client is properly configured, its user should not be aware of the proxy gateway. Firewalls ? DMZ add
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