1
00:00:00,240 --> 00:00:06,480
There are several advantages and disadvantages to why you'd want to use a query-based network management

2
00:00:06,480 --> 00:00:07,110
protocol.

3
00:00:08,090 --> 00:00:15,710
Firstly, query-based protocols are reliable because it's query-based, the network management station

4
00:00:15,710 --> 00:00:24,470
is queering or asking for information from a network device. If the NMS doesn't receive a response

5
00:00:24,560 --> 00:00:27,280
from the device, that indicates a problem.

6
00:00:28,160 --> 00:00:34,220
The fact that the NMS made a query and didn't get back a response indicates that there's a problem

7
00:00:34,220 --> 00:00:34,970
on the network.

8
00:00:35,900 --> 00:00:43,730
So no response equates to a problem query-based, also called polling-based network management protocols

9
00:00:44,000 --> 00:00:47,650
can be scheduled and you can set how frequently that's done.

10
00:00:48,530 --> 00:00:55,460
So you could pull the network on a very frequent basis or pull the network less frequently to reduce

11
00:00:55,460 --> 00:00:57,500
the impact of the queries on the network.

12
00:00:58,250 --> 00:01:05,300
As an example, you may not necessarily want to query a network device every five seconds because of

13
00:01:05,300 --> 00:01:07,200
the overhead that you're putting on the network.

14
00:01:08,030 --> 00:01:16,040
Now, in Orion Network Performance Monitor or Orion NPM also referred in this course to as solarwinds

15
00:01:16,040 --> 00:01:16,640
NPM.

16
00:01:17,650 --> 00:01:24,460
The default setting is two minutes for query-based polls for status information and nine minutes for

17
00:01:24,460 --> 00:01:26,680
query based polling firm statistics.

18
00:01:27,770 --> 00:01:32,450
Orion NPM uses both query and event based protocols.