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What is the difference between MAIL FROM: in SMTP and From: in the mail message itself? Suppose you wanted to do a transaction from a

What is the difference between MAIL FROM: in SMTP and From: in the mail message itself?

Suppose you wanted to do a transaction from a remote client to a server as fast as possible. Would you use UDP or TCP

?

Why?

Web caching has the ability to reduce the delay in receiving a requested object. Why? Web caching has the ability to reduce the delay for all objects requested by a user or for only some of the objects? Why?

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