Which of the following should NOT normally be allowed through a firewall?

A.
SNMP

B.
SMTP

C.
HTTP

D.
SSH

Explanation:
SNMP is used for monitoring network traffic. SNMP would monitor the traffic on a single segment and there
would be no reason to allow SNMP traffic through a firewall.
Incorrect Answers:
B: Users must be allowed to send email messages, so SMTP traffic must be allowed.
C: Users must be allowed to browse the internet, so HTTP traffic must be allowed.
D: Users must be allowed to log into a remote machine and execute commands, so SSH traffic must be
allowed.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 587