While trying to transfer a file from your laptop to a remote server via FTP, you

Question

While trying to transfer a file from your laptop to a remote server via FTP, you realize that the transfer is not working. After capturing packets on your computer’s network interface you see a lot of TCP SYN packets from your laptop going towards the remote server but you don’t see any packets from the server to your laptop. Based on this observation:

a) Is this information enough for you to determine why the file transfer isn’t working?

b) If Yes, explain why the file transfer is not working. If No, what additional information is required to determine the cause of the problem?

c) State two possible causes for the observation described above.

d) Suppose all of your TCP SYN packets successfully reach the remote server, what kind of network attack is the server vulnerable to?

Explanation / Answer

(a) No

(b) We'd need to know the buffer size of the sender, channel bandwidth and round trip delay of the packet.

(c)
Because maybe the remote server's buffer is full and it cannot accept any more packets, or the server has been switched.

(d)
It can be a Denial-of-Service Attack, sice because of the flooding of SYN packets, the server might not respond to other requests.

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