Which of type of polling takes place when a server is polled from another server?

A.
Threshold value

B.
Polling interval

C.
Internal polling

D.
External polling

Explanation:
External polling occurs when a server is polled externally from another server or from an administrator’s computer.
Incorrect
Answers:
A: Threshold value refers to the occasion when action should be taken because a value has dropped below a predetermined level.
B: The polling interval is the concept used to refer to when SNMP polls servers and network devices for important management information C: Internal polling is a type of polling that takes place internal to the network device being polled. An agent that is part of device is used.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 445-446.