Discussion
Which of the following services use TCP?
1.DHCP
2.SMTP
3.HTTP
4.TFTP
5.FTP
Answer: B
Correct answer: 2, 3 and 5
SMTP, HTTP and FTP all use TCP, because each needs delivery guaranteed and in order - a mail message, a web page and a file transfer are all useless with pieces missing. DHCP and TFTP use UDP: DHCP because a client has no address yet and must broadcast, and TFTP because it implements its own simple acknowledgement scheme and was designed to be small enough to fit in boot ROM.
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