A customer wants to increase firewall security. Which of the following are common reasons for
implementing port security on the firewall? (Select TWO).

A.
Preventing dictionary attacks on user passwords

B.
Reducing spam from outside email sources

C.
Shielding servers from attacks on internal services

D.
Blocking external probes for vulnerabilities

E.
Directing DNS queries to the primary server

Explanation:

Port security is required because if we keep the ports unsecure then hackers can do port scanning
and can compromise the internal secured network so we will have to shield servers to avoid
attacks from outside and we need to block incoming scanning request coming from outside.