proxy server types

we are given 12 choices for proxy types
i am familiar with only 1 thru 3 [socks, http]
when do you use the other options [4 thru 13] ?

checkpoint firewall 1
open ftp-host:ftp-port
site ftp-host ftp-port
site ftp-host:ftp-port
site ftp-user@ftp-host ftp-port
site ftp-user@ftp-host:ftp-port
user ftp-user@ftp-host ftp-port
user ftp-user@ftp-host:ftp-port
user ftp-user@ftp-host proxy-user
user proxy-user@ftp-host

thank you

[Pda0]

If you don't know, you really dont need to know

Firewall-1 is a popular firewall solution. The rest are different types of ftp proxies.

.pd

[bigstar]

the other types are for ftp proxies with custom login prompts. You only need to use them if the ftp proxy you are using required that format.