Organizations do not function out of only a few central locations anymore. People work from branch offices, from home, and from regional offices, with applications and data residing in cloud networks. In doing so, there are new challenges that arise in terms of networking management.
There should be reliability in connectivity, there needs to be consistency in application performance, and security policies need to apply regardless of location without adding any extra burden to administration.
A secure approach to SD-WAN networking connects security, traffic management, and connectivity even more closely. Instead of depending on hard-wired routing and configuration of devices manually, companies can manage traffic using policy-based approaches.
Why Distributed Networks Are More Complex
In the contemporary world, a corporate network may consist of headquarters, branches, offsite employees, cloud apps, data centers, and third-party providers. All of them have their own requirements for connectivity and performance.
Whereas one branch is using broadband connectivity, the other is using private or cellular backhaul. Additionally, offsite employees can use cloud applications as well in order to communicate and collaborate.
And here is the main problem – the path of the traffic does not have one single direction anymore from users to a data center. Moreover, traditional methods may force an IT department to configure each individual device manually.
Moving From Fixed Paths to Policy-Based Networking
Among the many innovations offered by SD-WAN is the capability to manage traffic using centralized policies.
Rather than considering all routes the same, policies are now set up according to application needs, network status, business needs, or security.
As an example, a company could give priority to voice and video traffic whenever real-time communication is important. Non-critical traffic could then go through another route in case the first one is congested.
This makes network management more flexible. Instead of having to determine how each form of traffic flows through the network, the administrator sets up policy rules that let the network manage itself based on those policies.
This means shifting from device management to network behavior management.
Security and Connectivity Work Together
Distributed networks present a greater security threat because, as applications, users, and devices from various places connect, the security controls should work similarly in these environments.
The branch may connect directly to the cloud applications instead of sending all data through the headquarters. Although this will cut down the extra backhauling process, security needs to be considered beyond the traditional boundary of perimeter.
SD-WAN security could introduce the issue of security into the network design. The choice of implementation would allow adding the features such as encryption, segmentation, access control, inspection, and policy enforcement.
This method is similar to recommendations by the Cybersecurity and Infrastructure Security Agency which stresses resiliency and consistent enforcement of security policies where there are various connectivity options used by branch offices, such as SD-WAN.
Security need not be considered an afterthought once routing decisions have been made.
What Changes for Network Teams?
The biggest operational change is often centralized management.
A centralized approach makes it easier to establish common policies and apply them across multiple sites.
This may include for networking teams:
- Less repetitive configuration
- Greater consistency in policies between sites
- Visibility into network conditions
- Better management of alternative connectivity options
- A faster reaction to changes in application needs
Application Performance Becomes a Network Consideration
All network traffic is not equally important for business purposes. For instance, a video conference may be vulnerable to delay and data loss, while a software patching may not be time-critical. A business application that handles customer transactions may be more mission critical than other applications.
The application-awareness policy enables a business organization to take into account the attributes of the workloads in managing network traffic. This can help a business utilize its network connections effectively.
If the quality of the connection gets degraded, then policies can route mission critical applications to another connection which might be appropriate.
Making Better Use of Multiple Connections
Many businesses do not rely only on one type of connection at every site anymore. There are many types of broadband connections, private connections, wireless connections, and others that could be used for different purposes.
Multiplexing several connections might make it easier to handle the connection problems but adding several connections is not enough to make the network management easier. The network should decide which traffic to route over which connection and which connection to choose as an alternative.
A secure SD-WAN offers a policy-based mechanism for managing these network links. Administrators can create policies based on application priorities, availability, performance, and security rather than just static routing.
Greater Visibility Can Improve Troubleshooting
It becomes hard to troubleshoot distributed networks when IT departments do not have visibility of what is going on in different places.
If an application slows down, the problem can be related to the local network, congestion, packet loss, or unavailability of the connection itself, among other factors.
Centralized visibility allows the teams to analyze network behavior from a more holistic viewpoint. The administrator can detect if the issue is limited to one branch, several branches, one application, or even one kind of connectivity.
The work of the Internet Engineering Task Force on SD-WAN overlay networks discusses policy-based routing, traffic segmentation, and secure communication over control planes as components of scalable SD-WAN architecture.
Scaling Without Adding Complexity
Establishing another branch should not involve developing a totally different network management policy.
With growth, organizations need procedures that can ensure deployment of connectivity, implementation of security policies, and performance monitoring.
This is achievable through use of the policy-based WAN, which enables organizations to develop standard configurations and policies applicable in many places.
Thus, scalability will not be achieved through individual configurations but through creation of an enabling environment that allows for more branches.
What Businesses Should Evaluate
SD-WAN that is secure is not a one-stop solution for all types of networking technologies. First, businesses should know about their existing networking technology along with its drawbacks.
Some important points that should be considered are:
- Which applications are more sensitive to latency and packet loss?
- How many locations require connectivity?
- What kind of connectivity options are there in each location?
- Which points have security or visibility issues?
- How are network policies being managed?
Businesses should also consider how their architecture will evolve as cloud applications, remote work, and distributed infrastructure grow.
The Broader Shift in Network Management
Secure SD-WAN represents more than a change in WAN technology. It reflects a broader shift in how businesses manage distributed connectivity.
This shift can also help organizations align network operations with business priorities.
Networks increasingly need to respond to application requirements, changing connection quality, cloud adoption, security policies, and organizational growth. That makes centralized visibility and policy-based control increasingly important.
For IT teams, the long-term value lies in having a network that can adapt without requiring every change to be handled manually at every location. For businesses, this can support more consistent connectivity and security as operations become increasingly distributed.
As applications and employees move beyond traditional corporate boundaries, network architecture needs to follow them. Secure SD-WAN provides one approach for bringing connectivity, performance, and security into a more coordinated model.
FAQs
1. What is a secure SD-WAN?
Secure SD-WAN refers to a software-defined technology in the field of WAN management that integrates policy-based traffic management with security features. It may assist organizations in managing connections within their branches, remote locations, cloud, and other dispersed facilities.
2. How does secure SD-WAN help distributed businesses?
It can provide for centralized policy management, application-based traffic management, network visibility, and use of different connectivity choices. This can make it simpler to manage distributed networks with growing locations and applications.
3. Does secure SD-WAN improve application performance?
Sure it can. With the help of application needs and network conditions, SD-WAN policies can route traffic through connections that suit particular workloads. The performance will depend upon the company’s infrastructure and network conditions.
4. Is secure SD-WAN suitable for cloud applications?
Absolutely. The secure SD-WAN is able to cater to situations where applications and data reside within cloud and on-premise environments. This can be facilitated via the use of the policy-based methodology that this network can leverage.
