Questions and Answers about Cisco 3850 Switches
Today I am going to talk about the queries about the Cisco 3850 Switch as it is one of the most used switch at the access layer in the large enterprise network and at core layer in some of the small and the mod sized enterprise networks.
I will address some of the concerns which some of you have for using the Cisco 3850 switch in your network. Below are some of the questions and the answer to that questions regarding the Cisco 3850 switches.
Q: What are the supporting uplink modules in the Cisco 3850 Switches ?
A: There are some of the supported uplink network modules in Cisco 3850 Switches and these are
I will address some of the concerns which some of you have for using the Cisco 3850 switch in your network. Below are some of the questions and the answer to that questions regarding the Cisco 3850 switches.
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| Fig 1.1- Cisco 3850 Switch |
Q: What are the supporting uplink modules in the Cisco 3850 Switches ?
A: There are some of the supported uplink network modules in Cisco 3850 Switches and these are
- 4x 1G Network Module
- 2 x 1/10 G Network Module
- 4 x 1/10 G Network Module and can be used for 48 port RJ models
- 8 x 10 G Network Module
- 2 x 40 G Network Module
Q: Does the Cisco Catalyst 3850 10G SFP+ 48-port switch support uplink modules ?
A: No. It has 4 fixed 40G QSFP ports for uplinks.
Q: Are the uplinks between the Cisco Catalyst 3850 and the 3750-X interchangeable?
A: No Because they are not compatible Continue reading
DNS over TLS: experience from the Go6lab
After the experiment with DPRIVE at IETF99, we thought we’d try to implement it in the Go6lab and see how this actually works in day-to-day reality.
The first step was to take a look at https://dnsprivacy.org/wiki/ as we had a feeling this might be the best source for information around this topic. There’s a ton of info about DNS over TLS, but what we were really looking for was simple instructions on how to setup a recursive DNS server to serve DNS responses over TLS (port 853), as well as how to setup a local client on our device that could talk to the server and accept local DNS queries over TLS, thereby protecting our DNS communications over the Internet.
We decided that running a TLS proxy was not the way to do it, so we used CentOS 7 VPS with Unbound installed. After some time and with extensive help from Willem Toorop from NLnet Labs (thanks Willem!!!) we managed to navigate the setup process for server and client.
Firstly, we installed the default Unbound from the CentOS7 default yum repositories, which turned out not to be a very good idea, as this version is 1.4.20 Continue reading
Worth Reading: Malware in your screen
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Cross Links in a Spine and Leaf
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Hey Alexa, Turn my lab on!
TL/DR Put together a custom Alexa Skill so I can turn switches and routers off in my lab as shown in the video here. Feels pretty great.
As most of my twitter followers have noticed, I’ve been doing a lot of Home Automation, mostly with Apple #homeKit. But I also picked up an Amazon Dot because… well why not?
One of the great things abut the digital voice assistance from Amazon, is that they have created an extensible framework that enables those with a little bit of coding skills to add to Mrs. A’s already already impressive impressive array of abilities.
The Amazon Alexa developer page is pretty impressive. There’s a ton of information and tutorials there, as well as an SDK and code examples in Node.js. I’m almost exclusively a python coder at this point, so I decided to look for something a little more familiar and came upon this.
Flask-Ask
Flask-Ask is a Flask extension that makes building Alexa skills for the Amazon Echo easier and much more fun.
Essentially, John Wheeler took the flask WSGI ( web) framework and made it super easy to be able to create Amazon Alexa skills using this familiar library. Continue reading
Worth Reading: It’s okay to forget what you read
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SDxCentral’s Top 10 Articles — August 2017
NetApp brags about its HCI; Top 10 security startups; VMware scores big with Vodafone.
Upcoming Events and Webinars
You might have noticed the “upcoming webinars” blog widget is gone and I’ll write a blog post every two weeks or so to keep you updated on upcoming webinars and other events.
Here’s what’s coming in September and October 2017:
- Does Docker (and containers) make sense with Cumulus Networks on September 21st in Zurich;
- Docker workshop on September 21st in Zurich;
- DevOps and Security for Enterprise Environments on September 28th;
- Second part of Network Visibility with Flow Data webinar on October 5th;
- Network automation workshop in Rome on October 18th.
Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017
Istanbul/Turkey Onsite CCDE Training will be held between October 30 – November 4. Course will be in English as usual, everyday will be between 9am – 6pm, 9 hours. I am going to extend my CCDE Materials for this course as there was new scenarios and the technologies after August 29, 2017 CCDE […]
The post Istanbul/Turkey Onsite CCDE Training – 50% OFF until Sep-15, 2017 appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Docker Networking Tip – Load balancing options in Docker
I had promised earlier that I will continue my Docker Networking Tip series. This is second in that series. The first one on Macvlan driver can be found here. In this presentation, I have covered different load balance options with Docker. Following topics are covered in this presentation: Overview of Service Discovery and Load balancing … Continue reading Docker Networking Tip – Load balancing options in Docker