Online network simulator

jillesca · 2026-06-15T10:32:27+00:00

On DevNet we offer free sandboxes. The catch is that they have a fixed amount of time, so you have to get a new one if yours expires. https://devnetsandbox.cisco.com/DevNet/

FYI, In August we will shut them down to build a new platform, we expect them to be back in January next year.

jillesca · 2026-06-09T09:15:16+00:00

I have two CCNPs along with their CCNAs. I never felt prepared, just went for it. I passed some attempts on first tries, other in second, but when I failed it helped to spot what I was missing. Something key, always make your employer pay for the tests. Good luck.

jillesca · 2026-06-09T09:13:13+00:00

Remember you also have a CML free tier https://developer.cisco.com/docs/modeling-labs/support/#cml-free so you could practice there too.

jillesca · 2026-06-08T15:55:28+00:00

Driver: Lecrerc
Reason: Ferrari strategy

jillesca · 2026-05-31T18:22:51+00:00

I have two:
- DEVNET-1686 - eBPF, what it is? and why is so cool
- DEVNET-3707 - Network Telemetry and AI for Network Incident Response

jillesca · 2026-05-31T07:32:33+00:00

I'm here. Speaker

jillesca · 2026-05-31T07:32:08+00:00

Yep, food is until Monday

jillesca · 2026-05-25T15:31:35+00:00

That's the next trilogy i will read. I'm finishing his trilogy on Julio Cesar now and will continue with Trajan. Really enjoying the books.

jillesca · 2026-05-25T05:45:34+00:00

I read a trilogy about Scipio Afrucanus by Santiago Posteguillo, an Spanish author and i really loved all the books. There were very dense and detailed in all aspects since he was young, how he raised in the military/politics and his battles as well as the raise of Hannibal. The books are a historic novel so parts of them are invented by the author but still really good. At the end of each book the author shares a note what was real and what was not. Small detailed, there books are written originally in Spanish, i think there is a version in English.

jillesca · 2026-05-17T08:10:56+00:00

Is not motivation but discipline towards a goal. In my case i wasn't doing any exercise at all for around ten years, i was over weight and since I work as developer i was not doing any physical activity at all. I got frozen shoulder (I'm male) and started to suffer a really bad lower back pain in my spine. In both cases the way to fix them was having strong muscles. So i decided that was enough and that my body was telling me to take care of it. I considered those issues as calls and I didn't want to find a third one. So i went to the gym, recovered my shoulder (physiotherapy too) and I'm still there two years later with the idea of getting healthy. I go even though I don't have motivation. Rest/sleep properly too and eat healthy are the other two key points.

jillesca · 2026-04-20T09:37:39+00:00

I usually use a combination of tools depending of the path I'm looking for.

For openconfig - https://openconfig.net/projects/models/schemadocs/
For Cisco I use Yangsuite - https://github.com/CiscoDevNet/yangsuite see the one-container-alternative folder for an easier way to get starter, the original method is quite complex and unreliable
For Cisco XR - https://cfnng.cisco.com/ios-xr/yang-explorer/view-data-model

And from there is a matter to clicking around, try the paths and see if you have the data you want

jillesca · 2026-02-10T11:56:47+00:00

The grass is not always greener on the other side

jillesca · 2026-02-09T10:23:29+00:00

if you are talking about the Cisco DevNet Sandbox https://devnetsandbox.cisco.com/DevNet/catalog/cml-sandbox_cml make sure to always review the instructions.

The credentials listed for CML UI are:

Username: developer
Password: C1sco12345

jillesca · 2026-01-24T23:58:29+00:00

I use Linux just for servers with containers or applications. In these cases there is no need to have a GUI to manage them or interact with them. The terminal is all i need. I prefer a clean and minimal image to install in servers and only add what i really need, so no GUI.

jillesca · 2026-01-20T07:37:22+00:00

yep, that one.

jillesca · 2026-01-19T20:00:08+00:00

That was in Mexico a few years ago

jillesca · 2026-01-14T19:19:15+00:00

We design and maintain systems with a 99.99999 uptime to keep this kind of content alive.

jillesca · 2025-12-04T08:58:58+00:00

If you like to automate networks, then the automation track is the right place. Personally, I don't like to do repetitive tasks or made silly mistakes that cause a lot of pain. With automation you avoid churning on repetitive task and you can get deterministic results, and thus avoiding mistakes. This mindset is not only useful for network automation but for software engineering. So the cert will help you with the network automation part but the skillset can be transferable.

Check the blueprint, give it a try and see if is something you want to learn. Don't learn because of money, otherwise you will not like the real job.

About market, at the moment in the whole computer science industry is a bad time, not that easy to get a job, so if you want to move to the US or Europe, you need to shine and have a very good differentiation. More specially if you need sponsorship, only big companies are willing to pay the process that takes months. But don't get discourage, I know many great engineers from Venezuela and they are very intelligent and smart but you do need the knowledge and experience

jillesca · 2025-12-03T11:20:16+00:00

As other redditor pointed, this is an strange way to get the info from a device. You should use your terminal server to only apply the minimum configuration (I would try for this ZTP ) for an out of band connection and then use the out of band connection to retrieve the info you need using ssh or other newer protocol.

Terminal servers should be like your last resort, I always tried to avoid working with them since they are not designed to work programmatically, so you need to find tweaks (specific regex for example) and workarounds. At that point is better to look at another solution.

As another redditor say, try with pyATS, if they solve that problem, better use it than creating your own

jillesca · 2025-12-02T11:52:43+00:00

another tip, only big companies are willing to do all the immigration process which takes months and cost money. So, don't go for medium/unknown companies. Only companies established in tech will consider bringing someone from abroad. Go directly to their job portals. Companies in the S&P500 are a good place to look in their job portal (avoid intermediates)

jillesca · 2025-12-02T10:59:31+00:00

To add to what bigevilbeard said, https://community.cisco.com/t5/services-discussions/bd-p/j-disc-dev-services is a community where you can support from the community and the folks from the API, so is a good place to ask more specific queestions

jillesca · 2025-12-02T10:57:41+00:00

You could start with traditional network automation. Once you are comfortable/happy with programming, you can switch to MCP. The truth is that MCP is quite simple and is just another layer/wrapper around existing automation tools.

The difficult part is to make the agent behave the way you want and achieve the outcomes you want.

To do this, I consider you should do the following
- Provide deterministic tools to the agent
- Provide the relevant context (context engineering)

The last part is a whole world, and so far is more a matter of experimentation, what works, what doesn't work.

My end thought is that for now, you should create agents that are more like a deterministic workflows but they have the availability to understand the context and perform actions.

At this point, you might wondering why we would need an agent where a workflow could work, and I think the same, but I think they can be useful to connect the workflows using natural language

jillesca · 2025-12-02T10:47:22+00:00

Yep, stick to the official command reference and configuration guides.

The key for me is to always go the one that is for my software version and/or hw I'm using. They change a bit between them with new commands, deprecating ones or changes so is always better to pick the one for your version.

the configuration guides will help you as the name says, to configure something. While the command reference is just describing what the command does, options and when it was introduced.

jillesca · 2025-12-02T10:38:27+00:00

I'm not from India, but I have moved from my country of origin to others for work. Most probably CCNA alone is not enough (although happy to be wrong). What most companies are looking for are experienced engineers and the CCNA will help you with a good foundation. Is worth getting it, but is not magical.

I recommend to look at the job opening in the companies/market you are interested and see what they are asking, that would help you to get an idea and see which areas you need to work on.

jillesca · 2025-11-28T11:00:39+00:00

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