All language subtitles for Free-CCNA-SNMP-Day-40-CCNA-200-301-Complete-Course_en

Welcome to Jeremy’s IT Lab. This is a free,\xa0\n

videos, please subscribe to follow along with the\xa0\n

and share the video to help spread this\xa0\n

In this video we will cover SNMP, the\xa0\n

SNMP is mentioned in exam topic 4.4, which says\xa0\n

in network operations. So, you don’t need\xa0\n

know how to set up an SNMP server,\xa0\n

Basically, you just need to know its\xa0\n

Here’s what we’ll cover in this video.\xa0\n

its purpose, how it works, etc.\n

versions of SNMP. There have actually been many\xa0\n

however you only really need to know 3 of them.\xa0\xa0

I’ll also give an overview of the different\xa0\n

And finally, some very basic SNMP configurations.\xa0\n

configuration as a requirement, I think it’s a\xa0\n

we will then try out in the next lab video.\xa0\n

practice question from Boson Software’s ExSim\xa0\n

So let me give you an overview of SNMP. SNMP is\xa0\n

was originally released in 1988. Most people think\xa0\n

into a larger framework of network management,\xa0\n

RFC was RFC 1065, structure and identification of\xa0\n

I think I mentioned RFCs, Requests For Comments,\xa0\n

how the IETF, Internet Engineering Task\xa0\n

The next RFC for SNMP was RFC 1066, management\xa0\n

TCP/IP-based internets. And one more, RFC\xa0\n

These three RFCs together make up SNMP version\xa0\n

defining other versions of SNMP, a few of\xa0\n

By the way, you don’t have to memorize these\xa0\n

Don’t let the ‘simple’ in the name fool\xa0\n

compared to the later versions, the current\xa0\n

I know I still have a lot to learn about SNMP.\xa0\n

you don’t need to know all the details, but you\xa0\n

SNMP. SNMP can be used to monitor the status\xa0\n

There are two main types of devices in SNMP.\xa0\n

the devices being managed using SNMP. For example,\xa0\n

We can use SNMP to monitor the status of\xa0\n

And the second type is the Network Management\xa0\n

Management System, instead of Station.\xa0\n

or devices, managing the managed devices I\xa0\n

although typically we use the\xa0\n

Let’s look more at how SNMP works. In this\xa0\n

Station or System. We’re using SNMP to manage R1\xa0\n

are three main operations used in SNMP, three main\xa0\n

The first one is that managed\xa0\n

For example, perhaps SW1’s G0/1 interface had a\xa0\n

It can send an SNMP message to the NMS, SRV1,\xa0\n

The actual SNMP software on the server, or\xa0\n

network administrator to inform\xa0\n

Okay, so managed devices can notify the NMS of\xa0\n

The NMS can also ask the managed devices\xa0\n

For example, perhaps the NMS, SRV1,\xa0\n

You want to make sure your network devices\xa0\n

R1 will then reply to the NMS, for example\xa0\n

So, that’s another function of SNMP.

And one more main operation used by SNMP is\xa0\n

aspects of their configuration. For example,\xa0\n

is 203.0.113.1/30. The NMS can tell R1 to\xa0\n

R1 will change the IP address\xa0\n

So, those are the three main operations used\xa0\n

NMS of events, the NMS can ask managed devices\xa0\n

and the NMS can also tell the managed\xa0\n

Now let’s look a little deeper\xa0\ninto how this all works.

These are the main components of SNMP.\xa0\xa0

Up top there is the NMS from the\xa0\n

On the bottom, the two managed devices, SW1 and\xa0\n

First, the components of the NMS. Let this green\xa0\n

The NMS probably isn’t a machine dedicated\xa0\n

PC which is running SNMP software. So, what\xa0\n

First, the SNMP Manager is the SNMP software on\xa0\n

It receives notifications, sends requests for\xa0\n

Next there is an SNMP application, this is\xa0\n

for the network admin to interact\xa0\n

statistics, charts, etc. Here’s what an\xa0\n

plenty of free and commercial SNMP applications\xa0\n

Next, let’s look at the managed devices, SW1\xa0\n

represents the SNMP entity on the managed\xa0\n

so of course SNMP is just a part of what’s running\xa0\n

Agent. This is the SNMP software running on the\xa0\n

Manager on the NMS. It sends notifications\xa0\n

Another important component is the\xa0\n

This is the structure that contains the variables\xa0\n

is identified with an Object ID, OID. Some\xa0\n

are the status of each interface on\xa0\n

CPU usage, device temperature, etc. Each of\xa0\n

So, that’s the basic structure of SNMP. Then,\xa0\n

and manager make SNMP work. Now before moving on\xa0\n

briefly introduce those Object IDs, OIDs, that are\xa0\n

SNMP Object IDs are organized in a hierarchical\xa0\n

how it breaks down. iso, identified-organization,\xa0\n

and sysName. So, this OID is used to identify the\xa0\n

For example, here’s that same network again.\xa0\n

what value do you have for this OID? SW1 then\xa0\n

countless different OIDs. If you want to explore\xa0\n

oid-info.com. That’s how I got the OID information\xa0\n

Now let me give a brief overview of the major\xa0\n

proposed and developed, however only three\xa0\n

The first is SNMPv1, this is the original version\xa0\n

multiple versions of SNMPv2, but v2c is the most\xa0\n

which allows the NMS to retrieve large amounts\xa0\n

single request, making it much more efficient,\xa0\n

The ‘c’ in the name refers to the ‘community\xa0\n

in SNMPv1, removed from SNMPv2, and\xa0\n

SNMPv2c. When we take a look at SNMP\xa0\n

demonstrate, so you’ll see how these community\xa0\n

Okay, the next major version and\xa0\n

It is a much more secure version of SNMP that\xa0\n

I’ll talk more about those terms in\xa0\n

but basically it means that SNMPv3 makes\xa0\n

read the SNMP messages, they can’t be\xa0\n

Now let’s look at the SNMP message types. In this\xa0\n

write, notification, and response. I’ve\xa0\n

and then listed the actual\xa0\n

First let’s take a look at the ‘read’ message\xa0\n

information from the managed devices. I already\xa0\n

asked SW1 what its host name is. There are three\xa0\n

I think this is more depth than necessary for\xa0\n

of those messages. First up is the Get message.\xa0\n

the NMS to the managed device, to\xa0\n

or multiple variables. The agent will send\xa0\n

of each variable. For example, our NMS here might\xa0\n

And SW1 responds with an SNMP ‘response’ message.\xa0\n

is sent from the manager to the agent to discover\xa0\n

it says ‘tell me the next OID’, so it can be\xa0\n

There is also the GetBulk message, which is a more\xa0\n

If you know the purpose of the basic Get\xa0\n

So, those are the ‘read’ messages. Next up, the\xa0\n

kind of message, which is ‘Set’. These are sent\xa0\n

devices, to change the value of a specific\xa0\n

Just like with the Get message, I already\xa0\n

when SRV1 made R1 change the IP\xa0\n

but I’ll demonstrate again. So, the Set message is\xa0\n

the value of one or more variables. Then the agent\xa0\n

For example, SRV1 can send a Set message to SW1,\xa0\n

SW1 will then change its host name, and send\xa0\n

So, that’s the write message\xa0\n

Next the ‘notification’ message class. These\xa0\n

to alert the NMS of a particular event,\xa0\n

There are two different messages,\xa0\n

First up, the Trap message. This is a\xa0\n

so the managed device to the NMS. The\xa0\n

to acknowledge that it received the\xa0\n

Also, SNMP uses UDP, so there\xa0\n

Now, unless there’s some problem in the\xa0\n

but since there is no reliability mechanism\xa0\n

I showed an example before, but here’s\xa0\n

so it sends a Trap message to the NMS,\xa0\n

This Trap will probably appear as an\xa0\n

and perhaps it will send an email notification\xa0\n

Okay, the next kind of notification message is the\xa0\n

is acknowledged with a response message. So, even\xa0\n

there is reliability built into the message\xa0\n

will send a Response to tell SW1 that the Inform\xa0\n

used for communications between managers,\xa0\n

However later updates to the protocol allow\xa0\n

So, those are the SNMP Trap and Inform messages.\xa0\n

one message, Response. These are messages sent\xa0\n

For example, Get messages, Set messages, and\xa0\n

of Response messages, so I think that’s enough for\xa0\n

information I just gave you will be more than\xa0\n

numbers in the Day 30 video on TCP and UDP, but\xa0\n

and SNMP Managers listen for messages on UDP port\xa0\n

Now let me demonstrate some\xa0\n

As I said before, SNMP configuration\xa0\n

but I think getting a bit of hands-on practice\xa0\n

cover setting up the NMS, that’s definitely\xa0\n

to set up the SNMP agent on a Cisco router. In\xa0\n

is the NMS, running an SNMP application. First\xa0\n

giving some contact information and the location\xa0\n

don’t need to configure this. Then I configured\xa0\n

these are basically SNMP passwords. Notice\xa0\n

as RO, this means read only. So, an NMS using\xa0\n

it can’t use Set to make any changes to R1.\xa0\n

read/write. An NMS using this password will be\xa0\n

using Set messages. Note that there are actually\xa0\n

and ‘private’ for RW. So, if you don’t specify\xa0\n

it’s best to configure the community strings and\xa0\n

Then I specified the address of the NMS, PC1 at\xa0\n

version and which community string to use with\xa0\n

be able to read information from R1, but it won’t\xa0\n

So, the read/write community string Jeremy2\xa0\n

Then I configured what kinds of traps to send to\xa0\n

so if an interface goes up or down Traps\xa0\n

so for example if configuration changes\xa0\n

that’s a simple SNMPv2c configuration. Let’s see\xa0\n

Here’s a Wireshark capture of the Trap that was\xa0\n

bottom, you’ll see numerous OIDs included in this\xa0\n

and as you can see it is a linkDown Trap,\xa0\n

Okay, now let’s look at some other fields of\xa0\n

2c that I configured. And here’s the community,\xa0\n

Note that this community string, this password,\xa0\n

there is no encryption. The community and\xa0\n

This is not secure, as the packets\xa0\n

So, as I mentioned before SNMPv3 is\xa0\n

configuration is also more complicated, so for\xa0\n

So, before moving on to the quiz let me summarize\xa0\n

a network. There are two main components of\xa0\n

managed using SNMP, such as network devices,\xa0\n

The network management stations, NMS, are\xa0\n

The NMS receives notifications from managed\xa0\n

devices. It can also check on the status of\xa0\n

status, temperature, traffic load, host name,\xa0\n

and each variable is identified using an object\xa0\n

version 1, version 2c, and version 3. Version 3\xa0\n

previous versions, providing encryption\xa0\n

And these are the SNMP messages we covered: Get,\xa0\n

Okay, that should be more than enough\xa0\n

Remember, the exam topics state you need to\xa0\n

There’s a lot more that can be learned about\xa0\n

As always, make sure to watch until the end of\xa0\n

Software’s ExSim, the best practice exams for the\xa0\n

Which of the following SNMP\xa0\n

to ‘read’ information from the managed\xa0\n

Here are the options. Pause the\xa0\n

The answers are D, Get, and G,\xa0\n

there is also the GetBulk message which is used\xa0\n

By the way, F, SetBulk, is not a real SNMP\xa0\n

Which of the following SNMP\xa0\n

Select all that apply. Here are the options.\xa0\n

The answers are A, Inform, and B, Trap. The\xa0\n

Informs and Traps are both sent from the managed\xa0\n

Set and Get messages are sent from\xa0\n

which listen on port 161, so they are\xa0\n

Which of the following SNMP message\xa0\n

and allows mass-retrieval of\xa0\n

Here are the options. Pause the\xa0\n

The answer is D, GetBulk. GetBulk is like an\xa0\n

NMS to discover the variables in the MIB of the\xa0\n

Which of the following pieces\xa0\n

Here are the options. Pause the\xa0\n

The answer is C, the SNMP Manager.\xa0\xa0

This is the software that interacts with\xa0\n

sends SNMP messages to and receives messages\xa0\n

Which of the following SNMP messages\xa0\n

Here are the options. Pause the\xa0\n

The answer is D, Trap. Traps are messages sent\xa0\n

aren’t acknowledged with a Response, so they are\xa0\n

in transmit for some reason, the managed device\xa0\n

the quiz. Next let’s take a look at a bonus\xa0\n

Okay here's today's Boson ExSim practice question.\xa0\n

NMS to extract information from an SNMP agent?\xa0\n

we have Inform, Trap, GetNext, Set, and Get. So\xa0\n

Okay so let's check. So it's asking us which of\xa0\n

NMS, that's the network management station, the\xa0\n

a managed device? So these first two choices,\xa0\n

messages are sent from the SNMP agent, the managed\xa0\n

D, and E are all sent from the NMS to the\xa0\n

or the object ID, of the next object, the next\xa0\n

to discover what objects, what OIDs, are in the\xa0\n

So I think that is one of the correct\xa0\n

from an SNMP agent. Now, Set is used to\xa0\n

used to extract information, it's used to change\xa0\n

is used to get the value of one of the variables,\xa0\n

I think E is correct also. So the two correct\xa0\n

the answers in Boson ExSim by clicking on 'show\xa0\n

So here is Boson's explanation, including an\xa0\n

I mentioned in this video. You can pause\xa0\n

And there is more down here,\xa0\n

And here. And there's also a\xa0\n

about the SNMP Get message type.\xa0\xa0

Okay so that was a look at Boson Software's ExSim\xa0\n

the best practice exams for the CCNA, and they are\xa0\n

for my CCNA exam. If you want to get Boson ExSim,\xa0\n

There are supplementary materials for\xa0\n

to use with the software ‘Anki’. There\xa0\n

so you can get some hands-on\xa0\n

next video. Sign up for my mailing\xa0\n

and I’ll send you all of the flashcards\xa0\n

Before finishing today’s video I want\xa0\n

To join, please click the ‘Join’ button under\xa0\n

Aaron, Tech Alameda, Marcel, Magrathea, Kone,\xa0\n

Benjamin, Tshepiso, Justin, Prakaash, Nasir,\xa0\n

Value, John, Funnydart, Velvijaykum, Mark, Yousif,\xa0\n

Sorry if I pronounced your name incorrectly,\xa0\n

This is the list of JCNP-level members at the time\xa0\n

you signed up recently and your name isn’t on\xa0\n

Thank you for watching. Please\xa0\n

like the video, leave a comment, and share the\xa0\n

If you want to leave a tip, check the links in the\xa0\n

and accept BAT, or Basic Attention Token, tips\xa0\n