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Video of How SNMP Works Network Fundamentals Part 24 in Networking Fundamentals course by Network Direction channel, video No. 25 free certified online
We can manage proactively, and we can manage reactively. SNMP is a protocol that can help us with both.
A management server will use SNMP polling to collect information from devices on our network. This builds charts and dashboards to help us evaluate the health of our network.
If a device has a problem, it may even send an SNMP trap to the management server. The server can then take an appropriate action, like alert us.
SNMP information is stored in a hierarchical structure called a MIB (Management Information Base). This is a collection of objects called OIDs (Object Identifiers). These describe the information that can be collected from devices, and how to interpret it.
When a poll is sent, the server will also specify a community string. This string is a simple form of authentication. Unfortunately, it is stored in plan-text, both in the message and in the configuration.
There are three versions of SNMP. v1 came first, and v2 extended this by adding support for 64-bit counters. v3 added real authentication and encryption. v3 is recommended in most cases.
Overview of this video:
0:00 Introduction
0:56 Polling and Traps
3:05 MIBs and OIDs
5:06 Community Strings
6:29 Versions
8:12 Configuration
Quiz Link: https://networkdirection.net/labsandquizzes/quizzes/snmp-quiz
Lab Link: https://networkdirection.net/labsandquizzes/labs/lab-snmp
SNMP Tester: https://www.paessler.com/tools/snmptester
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