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8. What POP3 messages are exchanged when youdownload mail rom the server?

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9. What HTTP messages are exchanged in download-ing,  lling, and uploading a Web orm?

10. What does connection persistence mean in HTTP 1.1?

11. Forward-caching vs. reverse-caching? (Compare theirlocation and cache content.)

12. How does an HTTP proxy intercept HTTP requestsdestined or HTTP servers?