$(16$pts$)$ Answer the following:

$($a$)$ Where is SSL deployed at TCP$/$IP stack?

On top of TCP layer.

$($b$)$ What type of keys are used in SSL$?$

Symmetric keys.

$($c$)$ List three ways of symmetric$-$key distribution.

KDC$,$ Diffie$-$Helman, Via PKC$.$

$($d$)$ What is the main goal of Kerberos system?

Single sign$-$on authentication service.