Question: 1. [Transport Service Requirement] Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than on UDP? (10 pts) 2. [Email] Suppose

1. [Transport Service Requirement] Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than on UDP? (10 pts)

2. [Email] Suppose Alice, with a Web-based e-mail account (such as Hotmail or g mail), sends a message to Bob, who accesses his mail from his mail server. Discuss how the message gets from Alices host to Bobs host. When a user deletes an email on her client, what are the differences of emails on the server between POP3 and IMAP? (10 pts)

3. [DNS] Describe two approaches to reduce the query overhead on DNS resolver. (8 pts)

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