Networking

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Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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Assume that as a role of System Administrator in SMB (or a startup group), you are requested to (re)design the IT infrastructure of the company. In this article, I will describe the steps of design, configure and operate the IT devices in a small business environment. (<50 users).
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Cloud Class® Course: Microsoft Office 2010
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Cloud Class® Course: Microsoft Office 2010

This course will introduce you to the interfaces and features of Microsoft Office 2010 Word, Excel, PowerPoint, Outlook, and Access. You will learn about the features that are shared between all products in the Office suite, as well as the new features that are product specific.

When you have a Wi-Fi, you might want to isolate the untrusted network from your network, since Wi-Fi is more vulnerable to attacks, as is a guest network. You will still be able to manage guest/Wi-Fi from your network. This is possible to do with an Edge router
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Fix RPC Server is unavailable Error in Exchange 2013, 2010, 2007, and 2003 Server. Different reason can such as network connectivity issue, name resolution issue, firewall, registry corruption that lead to RPC Server Unavailable error.
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In short, I will be giving a guide on how to install UNMS on a virtual machine in hyper-v and change the default port for security (you don’t need to have a server, since Windows 10 supports hyper-v)
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Scenario 1
This article is about building a site to site VPN tunnels in Cisco CSR1000V router with IOS XE. There are two Policy Based IPsec VPN tunnels configured on CSR1000V router one with NAT and another without NAT.
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Expert Comment

by:Isaivani Venkat
Comment Utility
ip nat outside source static 192.168.10.10 172.17.10.10 this NAT statement really required ???
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Author Comment

by:Santosh Salunke
Comment Utility
Hi Isaivani Venkat

ip nat outside source static 192.168.10.10 172.17.10.10

This NAT is to change branch user IP from 172.17.10.10 to 192.168.10.10. I had used this to demonstrate how to do 'Destination IP NAT'.
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Have a Cisco router that you forgot the password or maybe you bought a used router that is locked with a password? This article will guide you through the steps on how to recover the password on your Cisco gear.
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How to Perform Full Migration from Elastix to Issabel
If you try to migrate from Elastix to Issabel, you will face a lot of issues. These problems are inevitable but fortunately, you can fix them. In the guide below, I will explain how I performed the migration while keeping all data and successfully transferring all configurations.
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Expert Comment

by:sergio mak
Comment Utility
bonjour !!!
j'essaye d'installer issabel ,pas de soucy au niveaux de l'install,par contre je n'arrive pas à faire des appels sortant alors que mon trunk est registred
est il possible de faire un tuto sur la config du trunk de la route sortante et entrante je tourne en rond ca magace.
merci !!!
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Author Comment

by:RoohAllah Godazgar
Comment Utility
bonjour !!!
j'essaye d'installer issabel ,pas de soucy au niveaux de l'install,par contre je n'arrive pas à faire des appels sortant alors que mon trunk est registred
est il possible de faire un tuto sur la config du trunk de la route sortante et entrante je tourne en rond ca magace.
merci !!!

Dear Sergio,
Would you please ask your question in English. I'm not familiar with French.
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LinkedIn blogging is great for networking, building up an audience, and expanding your influence as well. However, if you want to achieve these results, you need to work really hard to make your post worth liking and sharing. Here are 4 tips that can help you do so.
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by:BillDL
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I personally feel that people should steer well clear of writing useful tips on "How to Write a Résumé" unless they are extremely well versed in what works and, of most importance, what does not work.  I think that the only people who are properly equipped to write such tips and articles are those who have a lot of experience in hiring staff for jobs and have therefore read or tried to read enough terrible, mediocre, and excellent résumés to be good judges of what grabbed their attention (good and bad).  Your linked page (How to Write a Good Resume - article on eliteessaywriters.com) demonstrates one of the pitfalls that becomes apparent when somebody tries to write an article on that subject, and the pitfall is trying to be too clever.

[A] Resume is not:
1. A summarization of the positions you held in the past

If I was the manager with the task of shortlisting applicants using their résumés and I saw the word "summarization" used in one, it would go straight into the "trying to be too clever" pile destined for the litter basket or shredder.  The word is either "summary" or "summation".  A conglomeration of the two words does not make a proper or better word because it has an "ize" in it.

There are already far too many "useful tips" articles about résumé writing floating around the Internet.  If the purpose of writing LinkedIn blogs is to "expand your influence", then I would suggest that unless you (LinkedIn member, not you personally) have already reached a level where you are expert on offering "Do and Don't" articles about how to succeed in job applications, then refrain from doing so.  The vast majority of LinkedIn members are there to find new or better jobs, and while sitting in that queue I do not think it is appropriate to try and provide tips to others in the same queue.  It equates to somebody on a modest income telling others how to get rich before managing to actually become rich.

I don't mean to sound scathing, but I feel quite strongly about this one aspect mentioned in your otherwise useful article.
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In this article I will be showing you how to subnet the easiest way possible for IPv4 (Internet Protocol version 4). This article does not cover IPv6. Keep in mind that subnetting requires lots of practice and time.
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Expert Comment

by:James Bunch
Comment Utility
This article is amazing. I am studying for the Network+ N10-006 test right now and was able to use this information along to correct mistakes I was making previously in trying to determine Subnets and ranges of given IP address/CIDR on the practice tests. This makes it easier to keep the math simple in my head as well as to follow how to finish the resolution of the problem without reworking parts of the scenario. Great work and thank you for sharing it with us!
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This article will show you step-by-step instructions to build your own NTP CentOS server. The network diagram shows the best practice to setup the NTP server farm for redundancy.  This article also serves as your NTP server documentation.
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Introducing Cloud Class® training courses
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Introducing Cloud Class® training courses

Tech changes fast. You can learn faster. That’s why we’re bringing professional training courses to Experts Exchange. With a subscription, you can access all the Cloud Class® courses to expand your education, prep for certifications, and get top-notch instructions.

In this article, the configuration steps in Zabbix to monitor devices via SNMP will be discussed with some real examples on Cisco Router/Switch, Catalyst Switch, NAS Synology device.
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How to fix a SonicWall Gateway Anti-Virus firewall blocking automatic updates to apps like Windows, Adobe, Symantec, etc.
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Unable to change the program that handles the scan event from a network attached Canon/Brother printer/scanner. This means you'll always have to choose which program handles this action, e.g. ControlCenter4 (in the case of a Brother).
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Tech spooks aren't just for those who are tech savvy, it also happens to those of us running a business. Check out the top tech spooks for business owners.
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If you’re involved with your company’s wide area network (WAN), you’ve probably heard about SD-WANs. They’re the “boy wonder” of networking, ostensibly allowing companies to replace expensive MPLS lines with low-cost Internet access. But, are they worth the investment?  As someone who makes and sells SD-WANs for a living, I do love the technology. However, even I know that SD-WANs aren’t a fit for every company. Here, then, are five reasons from an SD-WAN insider why not to buy an SD-WAN.


You might not save as much money as you thought

Numerous surveys show that a driver, if not the major driver, for SD-WANs is reduction in monthly spending for bandwidth. Proponents will point to the 90 percent difference between MPLS and Internet bandwidth. You will reduce costs, but often actual savings are much more conservative than the quoted 90 percent number. Many locations will require dual fiber links for reasons of resiliency, increasing costs. Service provider management, an inherent part of any MPLS service, must be assumed by the enterprise with SD-WAN -- another cost center. There are also security costs that need to be calculated, if branch offices are to use local Internet to improve cloud application performance.


So, where will cost savings come from? Depending on the SD-WAN selection, you can save the cost of replacing end-of-life routers at branch offices. Bandwidth costs will almost certainly reduce when replacing MPLS with Internet, unless you happen to be in a region where Internet availability is limited. SD-WANs offered by some Firewall-as-a-Service providers allow you to eliminate or reduce security as well as networking costs. You’ll also reduce your operational costs through the use of centralized configuration and management.


You might not be able to replace your MPLS networks

To be MPLS-free is the wish of any WAN manager, but there’s an excellent chance that with most SD-WANs, you’ll remain tied to the MPLS umbilical cord. Companies depending on latency-sensitive and loss-sensitive applications will not be able to deliver the kind of consistent, quality experience, day-in and day-out, with the Internet. As I mentioned, routing dynamics and Internet economics are such that there’s very little incentive for providers to deliver the kind of consistent latency and loss statistics needed by enterprise-grade application. This is particularly true when delivering services in underserved areas or between Internet regions. For those applications, organizations should retain MPLS or replace it with another SLA-backed backbone.


It will not make everything faster

The quality of experience (QoE) of some applications will improve with an SD-WAN when compared with MPLS, but not for all applications. SD-WANs are not WAN optimization, which applies a variety of compression, caching and protocol optimization, as well as link correction techniques to improve application efficiency, reduce latency, and minimize loss. SD-WANs are about controlling the overall network; WAN optimization improves one path across the network. SD-WANs may include WAN optimization techniques, but that’s the exception -- not the rule.

All SD-WANs can help improve application performance in three ways:


  • Applications requiring a lot of throughput (think: data replication or backup) will benefit from SD-WAN’s ability to leverage high-bandwidth Internet links.
  • Cloud and Internet application performance will improve by being able to access the Internet directly (direct Internet access, DIA) from a branch office, assuming secured Internet connection is provided. By contrast with MPLS, Internet traffic is commonly backhauled to a secured Internet portal. This can introduce significantly more latency into the connection through the so-called trombone effect.
  • Voice, video and other latency sensitive applications, in particular, benefit from the SD-WAN’s ability to select the path with the least latency.  Normally, Internet routing is application agnostic, routing traffic based on a combination of the number of hops and peering economics. By contrast, SD-WANs monitor the characteristics of the underlying transports and use that information, along with policies describing business logic, to select the optimum path to a destination.

 

Networking will not become easy

SD-WANs go a long way to making wide area networking more plug-and-play, but I don’t think anyone who’s deployed an SD-WAN will say it’s easy. Zero-touch deployment does make deployment far more rapid than configuring dozens of individual routers, but someone still needs to understand routing, policy configuration, network performance and more. Some vendors give you GUIs for those deployments, in which case large scale deployments may be tedious. Other vendors rely on CLI, in which case you’ll certainly want to retain the expertise of a networking engineer. Adding a multi-tunnel environment that’s used in overlay makes troubleshooting more challenging. Now you need to worry, not just about L3 and routing issues, but the SD-WAN, as well.

 

Security problems will not be solved

SD-WANs do not provide advanced security. They encrypt traffic, like any other VPN, which protects against wiretapping and man-in-the-middle attacks, but they provide none of the advanced security services needed to defend against malware penetration, advanced persistent threats and more. This is particularly important because SD-WANs rely on DIA to improve cloud and Internet performance. But direct internet access is only possible if those Internet connections can be secured against Internet-borne threats. You’ll still need to invest in IPS, malware protection, next generation firewall (NGFW) and other advanced security services, increasing the cost of an SD-WAN deployment.


As with any new technology, there are more than a few misconceptions around the value of SD-WANs. But there’s also real value to the technology around operational savings, end-to-end performance, and more. Understanding those benefits will help you get the most from you SD-WAN.

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This month, Experts Exchange’s free Course of the Month is focused on CompTIA IT Fundamentals.
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Originally, this post was published on Monitis Blog, you can check it here.


It goes without saying that technology has transformed society and the very nature of how we live, work, and communicate in ways that would’ve been incomprehensible 5 years ago. In that time frame, we’ve experienced momentous changes in the areas of mobile, cloud, and collaboration.


Just look at the way that mobile commerce has taken off; 2014 was the year it came of age thanks to breakthroughs like Apple Pay. Not to mention . . . the whole realm of cloud technologies has probably been the single biggest influence on IT. But watch out, next up is the Internet of Things, which has been causing major amounts of buzz for recent years.

 

While all of this rapid change is great for businesses and customers, new digital technologies are also creating unforeseen challenges for IT the world over. With the demand for instant software updates and real-time communications, IT shops have had to change their operations paradigm. It used to be that software release cycles would take upwards of 18-24 months or more. But with the innovations spurred on by the consumerization of IT and heightened customer demands, companies today are hard-pressed to get applications out the door as fast as possible.

 

IT has lead the charge in adopting quicker and more agile frameworks for managing software upgrades. Now the cycle for creating novel software apps from “soup to nuts” is about 3 months for an initial version and upwards of 6 months for the full feature set. And not only has the lifecycle shortened but apps have become much more complex and require cross-collaboration and integration between various IT constituents, such as Operations, Development, and Q&A in ways previously unimaginable. The result has been a new discipline known as DevOps.

 

So the obvious question to ask is this: “How is your organization leveraging DevOps today?” When it comes to your IT infrastructure, what are you doing to ensure faster production cycle times, more efficient workflows, and better cost savings and revenue generation? With these questions in mind, let’s look at the 5 most important things to know about DevOps right now.


 

devops

 


DevOps is a Paradigm-Shifting Approach to Software Builds

DevOps encompasses a whole mindshift in the approach to rolling out software releases and is as much a cultural shift as it’s a technological one (more on this below). DevOps is about excellent customer service, cost savings, and increased efficiency. But it’s also just as much about different business units being agile, adaptable, and flexible enough to work together to produce excellent products and services. DevOps is best summed up as a new way for people, process, and technology to work together in organic harmony.


  

DevOps is a Cultural Shift

DevOps is also about effective collaboration and communication across the organization. All of this gets at the importance of culture and cultural practices. Old habits die hard and if your organization is steeped in long-standing, traditional enterprise approaches to software development, then moving the needle on efficiency will obviously take longer.

 

Citing Lloyd Taylor, “You can’t directly change culture. But you can change behavior, and behavior becomes culture.” Start by creating an environment in which innovation and brainstorming are welcomed practices. Reward people for their ideas. Host a monthly innovation contest by providing a free lunch or $50 gift certificate to whoever finds the best solution to a manual, time-consuming process. If you look around, there are all kinds of opportunities to implement DevOps best practices into your work flow.

 

 

DevOps is all about Automation

The benefit of automating the testing and deployment process hardly needs explanation. With just a few clicks a continuous integration tool will run a series of unit tests, deploy the code to a new server, and then carry out a series of integration tests. The obvious takeaway is that continuous integration automation reduces cost and increases efficiency so that developers can spend their time writing code instead of tracking and fixing bugs.

 

Developing the ability to automate an organization’s infrastructure may seem like the most daunting of tasks, and it’s at this point that companies usually become their own worst enemy. Fortunately, there are a significant number of automation tools on the market now that can help make your build, test, monitoring, and deployment process efficient and effective.

 

A tool like Monitis can give your organization a jump start on your DevOps strategy by providing continual performance, testing, and monitoring updates for your infrastructure. As a cloud based-APM (application performance monitoring) company, Monitis provides customers with a clear and intuitive dashboard that lets them see whatever they want in their IT world in a glance. Whether it be Web apps, servers, networks, websites and more, it is all covered in the various monitoring tools that Monitis provides.

  


DevOps is the First Step to Web-Scale IT

Web-scale IT is defined as “a pattern of global-class computing that delivers the capabilities of large cloud service providers within an enterprise IT setting. More organizations will begin thinking, acting and building applications and infrastructure like Web giants such as Amazon, Google and Facebook.” Gartner also goes on to mention that DevOps is integral to this process and represents the first step for many organizations to scale up their operations “to drive rapid, continuous incremental development of applications and services.”

 

 

DevOps takes Time

There is no quick fix solution to creating a DevOps environment; it takes time to get key stakeholders onboard and to change policies, attitudes, and practices. Be persistent though and the dividends will pay off!

 

DevOps is an epic transformation in the world of IT that’s creating a host of new opportunities for businesses to become more agile and efficient in the delivery of their products and services. If followed through, DevOps adoption can dramatically save your organization significant amounts of time and money while boosting efficiency at all levels. The DevOps train is leaving the station, but it’s not too late to get onboard. Get started today to see the differences DevOps can make in the level and quality of your business practices.



Sign up for Monitis FREE 15-day full-featured trial! Premium plan starting from $12/month only!



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This article explains the fundamentals of industrial networking which ultimately is the backbone network which is providing communications for process devices like robots and other not so interesting stuff.
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This article is in regards to the Cisco QSFP-4SFP10G-CU1M cables, which are designed to uplink/downlink 40GB ports to 10GB SFP ports. I recently experienced this and found very little configuration documentation on how these are supposed to be configured.
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The 14th Annual Expert Award Winners
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The 14th Annual Expert Award Winners

The results are in! Meet the top members of our 2017 Expert Awards. Congratulations to all who qualified!

This program is used to assist in finding and resolving common problems with wireless connections.
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Expert Comment

by:Rob
Comment Utility
Found it: https://www.xirrus.com/inspector/.  Check this is right. I had to fill in their form first.
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Expert Comment

by:Freda Driscoll-Sbar
Comment Utility
Thank you for sharing! Great work and methodology.
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Make the most of your online learning experience.
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Flash Dir Head

WARNING:  If you follow the instructions here, you will wipe out your VTP and VLAN configurations.  Make sure you have backed up your switch!!!


I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TAC.  The basic problem was that I couldn't get the routers to route traffic in this kind of environment:



I wasn't using the firewall feature; just routing.  (The firewalls in the diagram were ASAs).

Well, the Cisco engineer couldn't figure out what was wrong, so I pulled a couple of routers out of the network and set up a small lab so the engineer could remote in and play with it.  The lab environment looked like this:



The networks were all connected with a Cisco 2950 24-port switch using VLAN and a Cisco 2601 configured as a router-on-a-stick.


I know... really old hardware, but it was just lying around collecting dust and it could do what I needed, so why not?


When I attempted to blank out the config, I couldn't get rid of the VLANs... which reminded me how frustrating VTP can be.


For example, years ago, I borrowed one of these 2950's from the datacenter where I have a few cabinets.  Before I returned it, I wiped the config.  Six months later, I get a call from their head engineer informing me that I had taken down the entire datacenter.


VTP configuration information is stored in the VLAN database, which is NOT deleted when one clears the config.  I had actually used VTP in my network, but they didn't and the VTP operating mode of all of their switches were still the default - "server".  So, when they put that switch back into production, my VTP config was pushed out across their network and every single VLAN database on every single switch was overwritten with my VLAN config.


The VLAN database is stored as a file in the flash memory.  To see it, go into privileged mode and issue a directory command for flash:



The VLAN database is stored in the file "vlan.dat".


Since Cisco represents the state-of-the-art for networking equipment, one could assume the VTP configuration could be reset by issuing a command such as "clear config vtp".  Of course, one would assume incorrectly.


You actually have to delete the file:

 


Once you've done that, you should be good to go.  Reload the switch and you'll find the VTP (and VLAN) configuration has been removed.


If you found this helpful, please click the blue "thumbs up" below!

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During and after that shift to cloud, one area that still poses a struggle for many organizations is what to do with their department file shares.
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This article is a collection of issues that people face from time to time and possible solutions to those issues. I hope you enjoy reading it.
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Originally, this post was published on Monitis Blog, you can check it here.


Websites are getting bigger and more complicated by the day. Video, images and custom fonts are all great for showcasing your product or service. But the price to pay in terms of reduced page load times and ultimately, decreased sales, could lead to some difficult decisions about what to cut.

 

Web loads speeds are integral factors in determining your SEO and how long customers will stay at your site. But web design, as important as it is for driving traffic, can also get in the way of your ultimate goal of bringing customers and revenue. In other words, you must avoid page bloat at all costs!

 

This is why businesses today, more than ever, must develop a clearly defined web performance optimization strategy. In fact, web monitoring should be an integral part of your web design best practices. To be clear, web performance optimization (or WPO) is the science of making your website perform better so it increases visitor retention, improves SEO, and drives more sales.


To give a great case study of how WPO works, consider what 37signals (now Basecamp) did with their Highrise marketing website. Using A/B testing, the company did multiple tests to determine the best plan for their landing page. In one case, the original background was white and cluttered with information. A dramatic change was made by replacing this white background with a picture of a person smiling.

 

The new landing page led to an increase in signups at the Highrise site by 102.5%!

 

This list provides another 99 great case studies of how WPO made a huge difference in website conversions.

 

In what follows, we take things further by providing you a brief checklist of the key steps to ensuring your website performance optimization strategy is on track.



Keep Things Fast! 

Website conversions are integrally tied to the speed of the site. One second saved in download time can make all the difference between a sale or a bounce.


  

Check Your Web Hosting 

Your web hosting may offer “unlimited bandwidth” but if it involves shared services with other websites that impacts overall performance, then is it really worth it? It’s always a good idea to periodically review your hosting plan to ensure you’re getting the best value for your dollar.

  


Make Your Site Mobile First

Having a “mobile first” website is critical to success in today’s digital marketplace. If you don’t believe it, just consider that mobile commerce transactions in the United States alone are expected to total $123 billion in 2016

  


Image Optimization 

“Page bloat” – or the practice of cramming websites with high density images – has gotten out of hand and is the number one culprit for long page loading times. Don’t bloat your website! One of the best ways to ensure proper image optimization is to adopt correct sizing and formatting for all your images.

  


Go Easy with Affiliate Codes & Ads  

Ads and affiliate code are good . . . up to a point! But when you go overboard, this can lead to high bounce rates and can adversely impact your overall website performance. Constantly check how third-party applications impact your load speed! 

 


Cache Often 

Caching is a mechanism for the temporary storage of web pages in order to reduce bandwidth and improve performance. This saves server time and makes your website faster overall.

  


Use a CDN 

Content Delivery Networks deliver the static files of a website, like CSS, images, and JavaScript, through servers that are in closer proximity to the user’s physical location. Every second that you save in download time is dollars in your pocket.

  


Make Your CTA Front & Center 

Don’t make your landing page a game of “guess where to check-out the merchandise.” Visitors don’t want to spend extra time trying to figure out where to complete their transactions. Your Call to Action should be front and center on the landing page.



Adopt Cloud-based Website Monitoring 

Imagine having all of the vital statistics for your website in a nice convenient dashboard, and getting alerts about trouble spots long before they reach impact your customers. Cloud hosted web monitoring is the crucial component in today’s digital marketplace. IT system monitoring is first of all a real time data that can help you respond to problems. You cannot do without monitoring tools, if you hope to optimize and maximize your application’s performance.



Sign up for Monitis FREE 15-day full-featured trial! Premium plan starting from $12/month only! 

2

Networking

92K

Solutions

67K

Contributors

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.