ECCouncil Ethical Hacking and Countermeasures V8 EC0-350 Question # 220 Topic 23 Discussion

ECCouncil Ethical Hacking and Countermeasures V8 EC0-350 Question # 220 Topic 23 Discussion

EC0-350 Exam Topic 23 Question 220 Discussion:
Question #: 220
Topic #: 23

A company has publicly hosted web applications and an internal Intranet protected by a firewall.  Which technique will help protect against enumeration?


A.

Reject all invalid email received via SMTP.


B.

Allow full DNS zone transfers.


C.

Remove A records for internal hosts.


D.

Enable null session pipes.


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