MTU and TCP MSS

The largest chunk of bytes that a transport protocol can forward across specific medium is called MTU – Maximum Transmission Unit. If we speak about Ethernet, which is today the most common, he has by default 1522 bytes MTU. The story about MTU is that the MTU of specific protocol basically defines how much payload (or highest protocols headers + their payload) it can carry in its biggest packet, not counting his own headers. Putting more payload into single packet than the MTU allows will result in fragmentation, the process of slicing the frame into more smaller frames so that

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Debugging data flows in reactive programs

Debugging data flows in reactive programs Banken et al., ICSE’18

To round off our look at papers from ICSE, here’s a really interesting look at the challenges of debugging reactive applications (with a certain Erik Meijer credited among the authors).

… in recent years the use of Reactive Programming (RP) has exploded. Languages such as Elm and libraries such as Reactor, Akka, and Rx are being used by companies such as Netflix, Microsoft, and Google, to build highly responsive and scalable systems.

The rise of reactive programming fits well with the increasing need to process streams of data. In a reactive program, you set up a data processing pipeline and then wait for input to arrive.

Many RP implementations share a notion of a collection that abstracts over time, in contrast to space like standard collections. This collection comes in different flavors, such as Observable (Rx)… the implementations differ in the precise semantics of their collections, their execution model (push/pull) , and the set of available operators.

While in theory events and threads are duals, in practice the RP abstraction works very well for expressing streaming pipelines. If you have an abstraction over time though, Continue reading

Viptela SDWAN Overview

Viptela is an SDWAN company that was recently purchased by Cisco. In this post I will go over the components that make up the Viptela secure extensible network (SEN) solution. By the end of this post you will have a good idea of the pieces that make up the Viptela puzzle. Network...

OpenStack Summit Vancouver recap: What we did and what’s next

A few weeks ago, I set out to the beautiful city of Vancouver’s convention center, along with a boatload of rocket turtles and a stellar team. It was a great time with a wonderful scenic view of the ocean. I’ve been at Cumulus a few months now, but I can’t help but enjoy looking around, seeing the friends I’ve made in the industry, and the friends and companies Cumulus has worked with over the years. It is exciting to have thousands of people coming together at OpenStack Summit Vancouver to work on a shared goal.

OpenStack Summit Vancouver

This year, we were lucky enough to have our very own Pete Lumbis take the stage with David Iles of Mellanox to present our joint solution around the latest SDN revolution, which is centered on creating efficient virtualized data center networks using VXLAN & EVPN.

In the next few paragraphs, I’ll share some highlights of the event, some photos, and a recap of that exact discussion. There was a lot to learn and discover, and I’m excited to share the details.

Day 1: Don’t you just love working with collaborative open source projects?

On our first day, lots of things were going on — we Continue reading

Train Your Team With INE And Reap The Benefits Of Becoming A Cisco Partner

Training with INE will not only keep you team on the cutting edge of the industry’s leading networking technologies, it will also put you on the path to becoming a Cisco Partner; a tangible way to show clients that you’re on the forefront of Cisco technologies and training. Cisco registered partners enjoy access to a wide variety of Cisco channel partner tools and are eligible to apply for Cisco certifications and specializations.

Additional Benefits Include:
  • Credibility: Capitalize on the Cisco Brand, which commands recognition and respect in the marketplace.
  • Credentials: Market your certified Cisco Expertise as a competitive differentiator to customers.
  • Momentum: Join the value-add partner program that is setting the pace in the industry.
  • Rewards: Add value for customers and drive growth and profitability with Cisco.
  • Relationships: Position your company to take advantage of more sales opportunities than ever before.

There are three levels of certification that a team can achieve; Cisco Select, Premier and Gold. Each level requires certain prerequisites, which INE’s industry-leading network training can provide. The three types of certifications are:




For more information contact our training advisors at [email protected] or by phone at +1-877-224-8987 or +1-775-862-4344 (outside the U.S.)

IDG Contributor Network: Skimping on business data protection could be a costly mistake

Data is essential to the smooth operation of any organization. Whether it’s data on your products, customers, or competition, you need it to do business. Your software and systems are dependent on the data that’s fed into them.Big data may be gathered by IoT sensors in vehicles and buildings, smartphones, and from countless other data points to inform big decisions. But at a granular level you also need small pieces of data to function. Without credentials you can’t gain access to the big data, contact suppliers, or even tweak the air conditioning system.Our dependence on data is profound, you might say it’s your business DNA because it’s crucial for survival and growth.To read this article in full, please click here

Delivering a Serverless API in 10 minutes using Workers

Delivering a Serverless API in 10 minutes using Workers

In preparation for Chrome’s Not Secure flag, which will update the indicator to show Not Secure when a site is not accessed over https, we wanted people to be able to test whether their site would pass. If you read our previous blog post about the existing misconceptions around using https, and preparing your site, you may have noticed a small fiddle, allowing you to test which sites will be deemed “Secure”. In preparation for the blog post itself, one of our PMs approached me asking for help making this fiddle come to life. It was a simple ask: we need an endpoint which runs logic to see if a given domain will automatically redirect to https.

The logic and requirements turned out to be very simple:
Make a serverless API endpoint
Input: domain (e.g. example.com)
Output: “secure” / “not secure”

Logic:

if http://example.com redirects to https://example.com
	Return “secure”
Else
	Return “not secure”

One additional requirement here was that we needed to follow redirects all the way; sites often redirect to http://www.example.com first, and only then redirect to https. That is an additional line of code I was prepared to handle.

I’ve done some Continue reading

3 people passed CCDE Practical/Lab exam on February 2018 from my class

3 people sent me their feedbacks after they pass February 2018 CCDE Practical/Lab exam.     Exam result was announced on May 2018 (2 to 3 months after according to new CCDE Practical exam result policy) but I couldn’t find a chance to share their results on the website.   I can’t count anymore how …

Continue reading "3 people passed CCDE Practical/Lab exam on February 2018 from my class"

The post 3 people passed CCDE Practical/Lab exam on February 2018 from my class appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

3 people passed CCDE Practical/Lab exam on February 2018 from my class

3 people sent me their feedbacks after they pass February 2018 CCDE Practical/Lab exam.     Exam result was announced on May 2018 (2 to 3 months after according to new CCDE Practical exam result policy) but I couldn’t find a chance to share their results on the website.   I can’t count anymore how …

Continue reading "3 people passed CCDE Practical/Lab exam on February 2018 from my class"

The post 3 people passed CCDE Practical/Lab exam on February 2018 from my class appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

3 people passed CCDE Practical/Lab exam on February 2018 from my class

3 people sent me their feedbacks after they pass February 2018 CCDE Practical/Lab exam.     Exam result was announced on May 2018 (2 to 3 months after according to new CCDE Practical exam result policy) but I couldn’t find a chance to share their results on the website.   I can’t count anymore how […]

The post 3 people passed CCDE Practical/Lab exam on February 2018 from my class appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

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