FTP & TFTP

Question 1

What is the use case for TFTP?

Answer 1

As traffic is unencrypted, its best used for quick file transfers in a controlled environment

Question 2

How does TFTP ensure reliability despite using UDP?

Answer 2

The reciever must send an “ack” when it recieves a message, if it does not, resend (“lock-step” communication)

Question 3

What are the three phases of TFTP

Answer 3

1. Connection
2. Data Transfer
3. Connection Termination

Question 4

What is the main difference between TFTP and FTP?

Answer 4

TFTP uses UDP while FTP uses TCP (20, 21). FTP also allows for finer controls like creating and changing directories

Question 5

How does FTP work?

Answer 5

FTP forms an initial connection using TCP 21 and then using TCP 20 when actually transferring files

Question 6

What are the two FTP modes?

Answer 6

1. Active mode - server initiates connection
2. Passive mode = Client initiates TCP connection (usually due to firewall)