Guidelines should be followed to allow secure remote administration. Which of the following is not one of those guidelines?

A.
A small number of administrators should be allowed to carry out remote functionality.

B.
Critical systems should be administered locally instead of remotely.

C.
Strong authentication should be in place.

D.
Telnet should be used to send commands and data.

Explanation:
D: Telnet should not be allowed for remote administration because it sends all data, including administrator credentials, in clear text. This type of communication
should go over more secure protocols, as in SSH.
+ A is incorrect because it is true that only a small number of administrators should be able to carry out remote functionality. This helps minimize the risk posed to
the network.
+ B is incorrect because it is true that critical systems should be administered locally instead of remotely. It is safer to send administrative commands over the
internal, private network than it is to do so over a public network.
+ C is incorrect because it is true that strong authentication should be in place for any administration activities. Anything less than strong authentication, such as a
password, would be easy for an attacker to crack and thereby gain administrative access.