Networking to and within the Azure Cloud, part 1

Hybrid networking is a nice thing, but the question then is how do we define hybrid networking? For me, in the context of the connectivity to virtual networks, ExpressRoute’s private peering or VPN connectivity, it is the ability to connect cross-premises resources to one or more Virtual Networks (VNets). While this all works nicely, and we know how to connect to the cloud, how do we network within the cloud? There are at least 3 Azure built-in ways of doing this. In this series of 3 blog posts, my intent is to briefly explain: Hybrid networking connectivity options Intra-cloud connectivity options Putting all these concepts together Hybrid Networking Connectivity Options What are the options? Basically, there are 4 options: Internet connectivity Point-to-site VPN (P2S VPN) Site-to-Site VPN (S2S VPN) ExpressRoute Internet Connectivity As its name suggests, internet connectivity makes your workloads accessible from the internet, by having you expose different public endpoints to workloads that live inside of the virtual network. These workloads could be exposed using internet-facing Load Balancer or simply assigning a public IP address to the ipconfig object, child of the NIC which is a child of the VM. This way, it becomes possible for anything on the internet to be able to reach that virtual machine, provided host firewall if applicable, network security groups (NSG), and User Defined Routes allows that to happen. So in that scenario, you could expose an application that needs to be public to the internet and be able to connect to it from anywhere, or from specific locations depending on the configuration of your workloads (NSGs, etc.). Point-to-Site VPN or Site-to-Site VPN These two, fall into the same category. They both need your VNet to have an VPN Gateway, and you can connect to it using either a VPN Client for your workstation as part of the Point-to-Site configuration or make sure you configure your on-premises VPN device to be able to terminate a Site-to-Site VPN. This way, on-premises devices are able to connect to resources within the VNet. The next blog post in the series will touch on intra-cloud connectivity options. ExpressRoute This connectivity is well described in the ExressRoute technical overview. Suffice to say that as with the Site-to-Site VPN options, ExpressRoute also allows you to connect to resources that are not necessarily in only one VNet. In fact, depending on the SKU, it can allow the connection to more than 1 VNet, up to 10 or, having the premium add-on, up to 100 depending on bandwidth. This is also going to be described in greater details in the next section, Intra-Cloud Connectivity Options.
Quelle: Azure

Here's How Accurate The Fitbit Alta HR Actually Is

We pitted Fitbit&;s new ultra-slim wristband against a chest strap to see just how accurately it could measure beats per minute.

There are a lot of reasons why you’d want to get a fitness tracker. Maybe you’re trying to gather insights about your sleep, or get fitter, or lose weight. Whatever your goal, one thing is true: a fitness tracker is useless if it can’t accurately measure whatever it is you’re trying to track.

Fitbit recently debuted the Alta HR, an ultra-slim wristband with a new feature: heart rate tracking. But just how accurately can the wearable track your beats per minute? When we did a first impressions review of the Alta HR last month, our preliminary tests suggested that the tracker’s heart rate technology wasn’t always on point. So we spent the last two weeks working up a sweat while wearing the new band — and as we originally suspected, the Alta HR struggled to keep up with exercises with a lot of movement and high intensity bursts. It did, however, reliably measure resting heart rate.

Experts say most people don’t actually need to know their exact heart rate during workouts, so this may not matter to you. But accuracy does matter for some, namely people with heart conditions and endurance athletes. Fitbit also heavily markets the heart-rate tracking capability of its latest devices, like the Charge HR, Blaze, and Surge — and last year, it faced a class-action lawsuit over its allegedly inaccurate technology. (The company has called the allegations “baseless” and contested the lawsuit, as well as noting that the devices are “not intended to be scientific or medical devices.”)

With all that in mind, we set out to answer the question: Should you still consider the $150 Alta HR? Here’s what we found.

Nicole Nguyen / BuzzFeed News

Unfortunately, we didn’t have access to an electrocardiograph, a medical device that’s considered the gold standard for heart-rate measuring. Instead we used the next best thing — a chest strap monitor, which multiple studies have shown to be significantly more accurate than wrist-based heart rate monitors, as our control. And we enlisted Open Lab Fellow/chart master Lam Vo to help us sort through all of the data.

For each run and bike ride, we wore a Polar H7 chest strap, in addition to the Fitbit Alta HR and Apple Watch. Nicole wore the devices on different wrists, while Stephanie wore the devices on the same wrist.

Nicole’s Long-ish Run: A Close Look at the Data

Nicole's Long-ish Run: A Close Look at the Data

During my first-impressions workout, a quick 17-minute run with short, intense uphill sprints, the Alta HR had trouble measuring my heart rate. So, this time around, I went for a longer interval run, switching between a light jog and uphill sprints, for about 40 minutes. The terrain was a mix of trails and concrete on rolling hills.

After the run, I checked each device’s workout summaries.The Polar Beat app measured a 160 beats per minute (bpm) average. Compared to that measurement, the Apple Watch overestimated the average by 1 beat (161 bpm), and the Fitbit Alta HR underestimated by 3 bpm, which is pretty impressive and consistent with Fitbit’s claim of average absolute error of less than 6 bpm versus an EKG (electrocardiograph) test strap.

I extracted the heart rate data from each device, and Lam created an interactive chart, so you can see exactly how the wearables performed throughout the duration of my run (try clicking the names of the device and hovering your mouse over the graph&;).

Nicole Nguyen / BuzzFeed News

Lam Vo / BuzzFeed News


View Entire List ›

Quelle: <a href="Here&039;s How Accurate The Fitbit Alta HR Actually Is“>BuzzFeed