SNMP Explained | Simple Network Management Protocol | Cisco CCNA 200-301

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SNMP stands for Simple Network Management Protocol.

SNMP is a standardized protocol used to collect and organise device information on a network. It does this over UDP port 161 (Traps are received on port 162).

There are three versions of SNMP.

- SNMPv1 which is the original version of SNMP

- SNMPv2c – This is the revised version which introduced some enhancements. Most notably the use of community strings for security. You can think of a community string like a password.

- SNMPv3 – Which is another improvement adding authentication and encryption. This version is much more secure than the previous versions.

A device that is SNMP enabled is known as an agent. An SNMP agent has several objects that can be interacted with. Some objects are part of the industry standard, and some will be vendor-specific for this device.

For example, this router will have objects for, name, uptime, interfaces, and the routing table to name just a few.

Each object is assigned an object identifier or OID. The OID is a sequence of numbers, which at first glance can look like an IP address. This is used to identify the object in a file called a MIB which stands for Management Information Base.

To interact with these object, we need something called a network management system or NMS. The NMS is a piece of software that can communicate with the SNMP agent.

There are a few ways the NMS can speak to the agent. The first way is by using GET requests. Get message include get, getNext and getBulk. They are used to actively request information from the agent.

The second way we can talk to an agent is by using SET requests. A set request is used to change a value on the agent.

The last method I want to talk about is Traps and Informs. Agents use traps and informs to actively communicate with the NMS. The agent can send a trap or inform to the NMS when an event occurs on the device.

Traps and informs are two different types of massage but they both do the same thing. The difference is that informs are reliable. An inform message will wait for an acknowledgement from the NMS. If it doesn’t receive one, it will resend the inform. A trap on the other hand is sent and then forgotten. Even though informs are consider reliable, both still use UDP.

#ccna #cisco #networking

[Loodough]

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[Hsank]

although i passed couple weeks studying SNMP because i needed it in my intership, i won't miss the explanation of certBros, it always come with a great benifit and its always an entertaining

[MrEspek]

14 minutes which I didn't know when passed. AWESOME tutorial! Thanks!

[WaleBusari]

I watch this video on March 11th 2021 and i will give you award of excellence as the best SNMP tutor of the century -Good job and have a great day always

[ahembalan]

I look out for content from certbros anytime I want to understand the basics of a concept in a very simple and friendly way language.

[mr_whyy]

Comments on Certbro's video are just wholesome, all of them. Quickly tells you how good this channel is, no need of the dislike count.

[srinis]

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[Mrs.Nizbits]

Just got my first IT job as a Jr MSP admin, and this video has helped me get a better understanding what SNMP does and how it work. Love your videos

[maknetworks]

wow all of this made sense after I read about snmp in the book called data communications by forouzan a wonderful and easy to understand book and top of that watched this video and saw practical demonstration, just a cherry on top, bravo certbros

[ogicacristian]

thank you very much! now i understand the basics of SNMP much better.

[xx]

Great explanation of how the SNMP works, and great visuals: simple and effective!

[fernandomercado]

Thank you very well explained. Thanks for showing the practical information on how it is used. Greetings from Argentina!

[dhanaballakshmanan]

Wonderful...which i was looking since a long time....I am CCNA instructor...should be very helpful for my students....
& will share it with them

[Ryryproductions]

this is all making sense now! thank you professor

[jeffreytackett]

When I hear someone say "rooter", instead of "rauhter", my brain itches.

[TheKulinos]

I am not expecting i could absorb easily your lecture because i am new in comp. network. but i was wrong! thank you so much....

[riatimohamed]

Great demo for SNMP protocol, thanks for your sharing.

[mrgigs]

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[ALIBAGHERIE]

I am not really comments guy but this video was perfect, thank you wish you best 🤞 🤞

[melulekinkomazana]

I like your videos they always clear out things for me. Explanation is top notch. Thanks a lot.