In Roam, each note becomes a node in your mind map, and there’s no central concept you have to start with. The map is fluid, with no hierarchy, no stacking, no linearity. It’s a giant knowledge web representing your notes and the connections between them.

TGW coupled with AWS Resource Access Manager will allow you to use a single Transit Gateway across multiple AWS accounts, however, it’s still limited to a single region.

Direct Connect Gateway – DGW DGW builds upon VGW capabilities adding the ability to connect VPCs in one region to a Direct Connect in another region. CIDR addresses cannot overlap. In addition, traffic will not route from VPC-A to the Direct Connect Gateway and to VPC-B. Traffic will have to route from the VPC-A —> Direct Connect —-> Data Centre Router —-> Direct Connect —> VPC-B.

Virtual Private Gateway – VGW The introduction of the VGW introduced the ability to let multiple VPCs, in the same region, on the same account, share a Direct Connect. Prior to this, you’d need a Direct Connect Private Virtual Interface (VIF) for each VPC, establishing a 1:1 correlation, which didn’t scale well both in terms of cost and administrative overhead.  VGW became a solution that reduced the expense of requiring new Direct Connect circuits for each VPC as long as both VPCs were in the same region, on the same account. This construct can be used with either Direct Connect or the Site-to-Site VPN.

AWS VGW vs DGW vs TGW

Our approach strikes a balance between privacy, computation overhead, and network latency. While single-party private information retrieval (PIR) and 1-out-of-N oblivious transfer solve some of our requirements, the communication overhead involved for a database of over 4 billion records is presently intractable. Alternatively, k-party PIR and hardware enclaves present efficient alternatives, but they require user trust in schemes that are not widely deployed yet in practice. For k-party PIR, there is a risk of collusion; for enclaves, there is a risk of hardware vulnerabilities and side-channels.

An elastic network interface (referred to as a network interface in this documentation) is a logical networking component in a VPC that represents a virtual network card.

Intrusion detection and intrusion prevention systems Monitor events in your network for security threats and stop threats once detected.

When it comes to building HTTP APIs, other frameworks weigh you down with tons of dependencies and unnecessary abstractions. Falcon cuts to the chase with a clean design that embraces HTTP and the REST architectural style.

GIS and Spatial Analytics Market: Global Size

Throttling network in Selenium tests using BrowserMob Proxy

Social solutions to social problems This document exists to lay out some general principles of running a small social network site that have worked for me. These principles are related to community building more than they are related to specific technologies. This is because the big problems with social network sites are not technical: the problems are social problems related to things like policy, values, and power.

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Running a small social network is like hosting a party. It requires social intelligence, empathy, and yes, technical skills.

so there won’t be a blinking bunny, at least not yet, let’s train our bunny to blink on command by mixing stimuli ( the tone and the air puff)

I have moments where I’m really involved and immersed in NYSCI and Hive almost on the same level, other times I have to take a step back, and sometimes the Hive has gone a little MIA or quiet as they transition and figure things out, as they shape the network. It’s been a bit of a roller coaster ride over the past couple of years. For me, that’s been the biggest challenge — going through that process.

Success? I don’t really like that term, because the opposite of success is assumed to be failure. When we talk in terms of social movements, I think the most important thing is to continue fighting, doing the work, establishing networks, making connections, meeting people, exchanging ideas, and at some point, achieving greater change. In that context, and using your term, I believe that continuing our work should always be considered a success.

There are various elements that contribute to the difficulty of brokering within a network like Remake Learning, such as competition (for funding, for participants, etc), and less sharing  because of it. Networks can help share metrics, data, and build pathways for young people to participate between programs, but it’s still not working for everyone. It’s a multi-sector problem, which is why it’s important to work with organizations like Mozilla, or with the government, or with the private sector, in addition to all the nonprofits, academia, and K-12.

Another instance, is my collaboration with the Nemetics Institute of Arts and Science, Kolkata (NIASK), where I do research on complex adaptive systems, and design pieces to share the Institute’s research. It is a network of many great minds, who are scattered around the world. I’ve been working with them for a while now, and, even though I feel that I know them, I have only met two of them in person. We work online, and we use Twitter, Popplet, Gtools, and any other new open source tech we can find. It’s because of this ability to connect and collaborate online that we are able to work together, even from far away. The open web and open source technologies provide opportunities to collaborate with people we’ve never met, across the globe.

I was part of the team that founded Creative Commons in Tanzania. Since that time, we’ve created a large network and come to know so many people. To me, that’s the greatest strength of my involvement with CC; I’ve gotten to connect not only with people from Tanzania, but also people from around the world. I now have friends in places like South Africa, Kenya, Nigeria – and colleagues in South Korea and Canada, where I attended previous summits. If it weren’t for Creative Commons, I wouldn’t have met these people. The success is the power of networking.

It’s so hard to capture those network effects. It’s something we did, we are, and we will continue to struggle with. You probably know that a little bit from your PASE experience. We understand that those results from the network effect can be so impactful, but they’re so hard to measure and talk about.

As a participant in the Hive network, there were many moments when I felt that there were great ideas being shared. What I always enjoyed the most was hearing from other organizations and what they were doing. I would learn about their work, their unique perspective, and their way of doing things with young people. When it came to working together and collaborating, I didn’t always feel like everyone was truly open to that or able to engage in that way. I felt some wanted to keep a really close, tight knit group so it was hard to figure out how to actually begin collaborations. A lot of the groups were smaller organizations and so funding is always a driving factor and they likely saw others as competitors, making it difficult to figure out how collaboration could work. There were moments when I kind of felt like, “Do I really belong in this room right now?” But I felt there was always a greater good and that I had something to offer and things to learn, which is what kept bringing me back.

People conflate ideas of community and network and think that they’re interchangeable, but they’re not. Communities are strong because of their similarity in their bonds and they tend to circle and look inward. Networks — and I’m not saying these are mutually exclusive or that one’s better than the other, I’m just articulating where I think a difference is — intentionally look outward and leverage difference to augment and gain strength over time. And so many people when they do this kind of work miss the nuance of the difference and they’ll use community and network interchangeably in the space of two sentences. That really misses the power and the weaknesses of both systems. So it starts with understanding that a network is actually going to be seeking out difference to build its strength. Successful networks understand the difference between strong and weak bonds and that weak bonds are actually incredibly powerful and useful. To then take those networks to be high-performing, you actually want the nodes in the network, whether they be people or organizations or a mix, to understand how to toggle between being strong and weak. A strong network is going to know when those things turn on or off, depending on the problem, depending on the opportunity, and so on. A network is strong when you have many dormant, weak connections that can flip back on. Hive NYC, as a project able to advance a field, did so because of these networked practices.

I think the Pinkerton Foundation sees the value in networks and in people in the field sharing best practices. There’s no reason to reinvent the wheel for out-of-school programming, especially around digital learning, so it’s important for us, and the individual organizations, to see the network continue. The challenge is that the Hive started off as a funding stream, so a lot of organizations came together in part to share best practices, but also for the potential to receive funding. Now that that piece is gone, I worry about how involved the members will continue to be, but encourage them to stay connected, especially because of the value that it has on their programming. For the network to continue, there needs to be a group of members who are willing to take the lead and organize the meetings and other gatherings. And I understand that it requires time and resources that some members may not be able to commit to.

Earlier on, I struggled with not knowing how other organizations could become part of the network. I wasn’t sure about the structure or timeline for members to join and participate in that kind of community. It was great to see that a few of my grantees had come on board.

Right now, a lot of people are getting turned off and apathetic from participating in developing community infrastructure. We need to nurture participation and show how important it is. Right now, the civic sphere — the words and the rhetoric — looks scary, aggressive, and mean. I don’t want our folks to turn off and to not participate.

Amazon Virtual Private Cloud (VPC) now allows customers to expand their existing VPCs

When designing the addressing plan for an application, the primary consideration is to keep the CIDR blocks used for creating subnets within a single zone as contiguous as possible

The CIDR block must not be the same or larger than the CIDR range of a route in any of the VPC route tables.

You have a limit on the number of CIDR blocks you can associate with a VPC and the number of routes you can add to a route table. You cannot associate a CIDR block if this results in you exceeding your limits.

You cannot increase or decrease the size of an existing CIDR block.

The allowed block size is between a /28 netmask and /16 netmask.

Adding IPv4 CIDR Blocks to a VPC

Example: VCN and Subnet Sizing

Example: VCN and Subnet Sizing

ip命令可以说是无比强大了，它完全可以替换ifconfig、netstat、route、arp等命令，比如查看网卡eth1 IP地址：

Beauty is no quality in things themselves: It exists merely in the mind which contemplatesthem;

African American writers and readers also forged alliances with white abolitionist