If your LAN utilizes a proxy server, and you wish to send an email message from your workstation inside the LAN to a colleague via the Internet, what does this process look like?
What will be an ideal response?
ANSWER: The process works as follows:
Step 1: Your message goes to the proxy server. Depending on the configuration of your network, you might or might not have to log on separately to the proxy server first.
Step 2: The proxy server repackages the data frames that make up the message so that, rather than your workstation's IP address being the source, the proxy server inserts its own IP address as the source.
Step 3: The proxy server passes your repackaged data to a packet-filtering firewall.
Step 4: The firewall verifies that the source IP address in your packets is valid (that it came from the proxy server) and then sends your message to the Internet.
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