Top 5 FAQs about SD-WAN that you should know !


1.What does SD- WAN Mean


A Software-defined Wide Area Network (SD-WAN) is a virtual WAN architecture that allows organisations to employ any combination of transport services—including MPLS, LTE and broadband internet services—to securely connect users to applications.


SD-WAN explanation


Since it wastes bandwidth and introduces latency, the conventional model of backhauling traffic from branch offices to the data centre for thorough security inspection is no longer the best option. There is a significant need for a better method of sending traffic from branch locations to reputable SaaS and cloud-based apps directly over the internet while remaining compliant with organisational security standards.


A SD-WAN guarantees constant application performance and resilience, automates traffic steering in an application-driven manner based on business intent, enhances network security, and streamlines WAN architecture. An SD-WAN employs centralised control to intelligently and securely direct traffic across the WAN to reliable SaaS and IaaS providers. This improves user experience and application performance, which boosts corporate productivity and agility and lowers IT expenses.


2.What are the pros and cons of SD WAN


The logical next step in networking technology is SD-WANs. They do, of course, have their shortcomings. Reliability, security, and quality of service are the three main things they strive to provide to consumers in order to support the success of their enterprises. Since legacy networks were never design to be virtualization-friendly, they are constraining in all three areas. Due to this, businesses were compelling to abandon outdate’s technology and switch to a software-defined strategy.


Customers must fully understand that while the SD design aims to boost network agility and responsiveness, they are not a one-size-fits-all solution because standards must still be upheld. You should weigh the benefits and drawbacks of using the software-defined approach to create your architecture.



The future of networks as we currently know them will shortly be SD-WANs. In order to satisfy their client base and operational needs, businesses are fast implementing public clouds. They offer a variety of benefits to organisations, such as:


-WAN optimization facilitates network functioning and is made possible by cloud-based automation and management. Using an SD network controller results in the centralization of network management. Implementing enterprise-level policies at the corporate headquarters and subsidiary branch offices is made simpler by the controller. To make the WAN behave like data is travelling across a LAN, a variety of techniques are used, including compression, tokenization, application proxies, caching, and deduplication.


-compared to earlier architectures, improves and makes more agile commercial applications. To effectively prioritise programmes and make better use of the network bandwidth available, administrators will be able to set minimum and maximum bandwidth limitations.

-enhances the efficiency and user experience for cloud-based and SaaS applications.

-reduces costs and gives the network independence across MPLS, 3G, 4G, and other networks.

-within the network, routine processes like provisioning and setups are automated.

-enhances traffic management for businesses. System administrators can view metrics on network performance on the unified dashboard.

-includes malware-protected next-generation firewalls (NGFWs) to fend off hostile cyber assaults. As data packets approach the firewall’s perimeter, they are thoroughly inspected.

-in the network enterprise, vendor service-level agreements assure a consistent user experience.



Like any other network, SD-WANs have drawbacks and shortcomings. You should take into account the following disadvantages:


-SD-WANs have not been fully implemented yet. Currently, businesses still rely on dated connections to maintain both internal and external operations. By using the hybrid approach, this is made up for.

-On-site security features are nonexistent. To keep your network safe and secure from external attacks, security standards will still need to be applied. The entire company could be compromised by a small data breach.

-It will be extremely difficult to adopt and maintain this technical solution without the help of IT staffs. Calling in outside aid will be an expensive endeavour if they are unable to accomplish it.

-Slow performance is unaffected by SD-WAN networks.

-If only SD-WAN features are being used, there is no genuine end-to-end QoS.

-The SD-WAN suppliers frequently fall short of what was initially intended for software-based networking due to their wide range.

-Instead of typical WAN circuits, SD-WAN forwarding equipment provide Ethernet connections to connect to your WAN and LAN. You must keep your current WAN router in order to support your SD design if a time-division multiplexer is required to support your network.



3. How does SD-WAN works?


To connect remote or branch users to applications located in data centres, traditional WANs require physical routers. Each router has a control plane that directs the data where to go and a data plane that stores the information. A network engineer or administrator normally decides where data flows by writing rules and policies, frequently manually, for each router on the network. This method can be time-consuming and error-prone.


SD-WAN separates management and administration operations from underlying networking technology, making them easy to configure and deploy. A single control panel allows network managers to design, customise, and rapidly deploy new rules and policies.


4. How do you implement SD-WAN


You can develop your SD-WAN with some proven successful implementation plans below.


Because they want quick, scalable, and flexible communication between various network environments, more enterprises are looking into SD-WAN solutions. However, picking the incorrect SD-WAN solution may hinder your ability to quickly adjust to shifting business demands. It may also result in unforeseen security difficulties.


5 Requirements for a Secure SD-WAN Implementation


These five factors should be taken into account for a successful Secure SD-WAN installation, whether you are contemplating SD-WAN for the first time or revising your present approach.


1. Work from any location (WFA)

Numerous employees were sent home due to the COVID pandemic, which increased the demand on networks and IT. And even though many people anticipated going back to work, the work-from-home paradigm has developed into a mixed work model in many firms. Employees can now work remotely, from a home office, an office location, or via a mobile device. However, putting this work-from-anywhere (WFA) approach into practise can be challenging. Due to the necessity of balancing experience and security, it raises the level of network complexity. Furthermore, no matter where they are or what device they are using, users must have the same experience when using applications and collaboration tools.


SD-WAN systems should include a ZTNA Access Proxy to support WFA. ZTNA improves security and visibility across all users, programmes, and devices, on or off the network, and gives a better user experience than a VPN. ZTNA provides a single security policy across all network edges to ensure uniform attack surface protection.


2. Scalability that is dynamic


Agility is a requirement for firms to meet digital transformation goals. Many have chosen hybrid and multi-cloud methods and created new intelligent edge resources with this in mind. SD-WAN must have the flexibility and on-demand connectivity between the corporate headquarters, branch sites, home offices, and multi-cloud environments to dynamically scale to any environment or workload. The SD-WAN solution should be able to scale to thousands of sites across varied settings in order to be ready for future growth. To make management at scale simpler, it ought to have a single-pane-of-glass management system.


AIOps can streamline troubleshooting, spot abnormalities, and forecast different kinds of failure based on machine learning models. Additionally, enterprises may quickly scale while reducing overhead costs and boosting productivity thanks to day-0, day-1, and day 2+ networking procedures that are simplified.


3. Performance of Clouds


Businesses with a hybrid or multi-cloud strategy should search for an SD-WAN solution that can solve cloud connection if they want consistent security and performance on and between various cloud platforms. By enabling quick, secure connectivity to the cloud and maintaining high performance there as a native solution as well as across clouds by federating inter-cloud protocols in real-time, it should make cloud on-ramp simpler.


4. Edge Security


Because SD-WAN connections are so dynamic, systems must be able to track bandwidth usage and packet loss and alter connections in real time. However, a lot of overlay-deployed security solutions aren’t scalable. Security lags behind network changes, which leads to connection flexibility restrictions and security flaws.


Advanced security and routing capabilities are combined in an SD-WAN system that uses a security-driven networking strategy. Whether built-in or SASE-based cloud-delivered security is used, these solutions can enhance operations and offer reliable protection. The same security stack should be present everywhere, regardless of the delivery mechanism, to provide uniform threat protection for outbound traffic and internally for the network to stop the lateral flow of threats. Organizations should search for solutions that have been designed to offer maximum performance even for thorough examination of vital traffic because the solution must inspect encrypted information in real-time.


5. Branch Assistance


The branch office’s outermost boundary is not where security and connection terminate. To monitor and protect connectivity and transactions over the local area network, a good SD-WAN solution should extend its fundamental capabilities further into the branch network.


Together, SD-Branch and SD-WAN should be used to create a safe and managed distant branch by integrating security, WAN, LAN, and WLAN into a single system at dispersed sites. As a cellular gateway, it should also support LTE and 5G in order to improve availability and resilience for SD-WAN deployment.


Related article: What is SD-WAN and why should IT Professionals care ? 


5. Is SD-WAN a VPN?

Cost, performance, dependability, and configuration & maintenance are crucial factors to take into account when comparing WAN connectivity solutions. Let’s compare the SD-WAN vs. VPN arguments in these areas.


VPN vs. SD-WAN: Price

Enterprises can take use of reasonably priced public Internet bandwidth thanks to both Internet-based VPN and SD-WAN. VPN can be a low-cost option for a few sites and a straightforward WAN topology in modest installations. For instance, using inexpensive servers and free software like Openswan, a straightforward site-to-site link can be established. However, as we observed with BioIVT, the complexity and constraints brought about by growing VPN-based networks might significantly outweigh any initial cost reductions.


Performance of VPN versus SD-WAN

In terms of performance, internet-based VPNs are inextricably link to the general internet. Using VPN-based WANs typically results in significant latency when travelling across long distances, in addition to congestion spikes that affect performance.


Additionally, VPN lacks performance-enhancing capabilities like dynamic path selection, QoS (Quality of Service), and application-aware routing that guarantee applications like VoIP and telepresence offer the necessary levels of performance. These characteristics are provided by SD-WAN, and latency over large geographic distances is no longer an issue with cloud-based SD-WAN. Over 45 PoPs (Points of Presence) are part of Cato’s SLA-back global private backbone. Performance problems with the public Internet in the middle mile are avoiding since traffic is directing to the closest PoP and across Cato’s high-speed backbone.


VPN vs. SD-WAN: Reliability

Before the SD-WAN vs. MPLS controversy came to a conclusion, the absence of a SLA with the public Internet was a widespread criticism of both appliance-base SD-WAN and VPN. Businesses require consistent, predictable performance. Although Cato’s SLA-backed global backbone is connecting by numerous Tier-1 providers across the world, VPN still depends on the public Internet. As a result, the Cato Cloud is able to provide predictable service and reliability at levels that are on par with or higher than MPLS.


Configuration & Maintenance of SD-WAN vs. VPN

VPN setting frequently requires a lot of manual labour. IKE (Internet Key Exchange), NAT-T (Network Address Translation Traversal), and IPsec tunnelling all demand a high level of technical knowledge to configure safely and scale. Network maintenance is harder and more challenging when additional locations are adding to a WAN. Performance problems and a fragmented WAN infrastructure are the results of this.


Paysafe Financial Services has firsthand knowledge with the difficulties posed by scaling VPN. It was left with a backbone made up of MPLS circuits and Internet-base VPN connections after a number of mergers and acquisitions. Paysafe would have needed 210 VPN tunnels, which would have taken a significant time and resource commitment, to build a properly meshed network utilising an Internet-based VPN. Stuart Gall, then-infrastructure Payscale’s architect, claimed that VPN in particular was a problem for their WAN. Gall added that whenever they needed VPN connectivity, “someone at a site would demand connectivity to a new location, causing a reprovisioning process. Work on it may take weeks, what with all the permissions.


What was the answer Paysafe came up with to their problems? Cloud Cato. Payscale was able to gain from Cato’s scalable cloud-based service paradigm, automatic, scalable, policy-based settings. Paysafe was able to cut latency by 45% when compared to VPN and streamline WAN settings and provisioning time. How much quicker was Cato configuration? According to Gall, “Cato Socket deployment takes no more than 30 minutes – including packaging” as opposed to “weeks bringing up a new site on MPLS or even a VPN.”


Paysafe previously used different security solutions, but Cato’s enterprise-grade security permitted secure scaling without the need for NGFWs (next-generation firewalls).


Wrapping up


No matter where you are, SD-WAN is design to serve your business needs, whether you are working in the office or at home. Along with a fine-grained level of service quality, there are numerous opportunities for cost savings and security. Before deciding to switch to SD-WAN, IT teams must consider every aspect of their network infrastructure.


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