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Network Slicing: Not As Dicey As You Might Think!

May 30, 2019 — by Eyal Yaron — 0

Every now and again, we hear a new technical term that requires a cursory Google search to make sure we are current with the times. Sometimes new terms are just recycling old concepts. Right now “Network Slicing” is en vogue, promising to help enable the evolution of modern networks.

At its core, it involves the ability to run multiple virtual networks across a shared physical infrastructure – essentially a separation of data plane and control plane. We have seen these before, for example in Software Defined Networking (SDN) and Network Functions Virtualization (NFV), both of which are inextricably linked to network slicing. Although often used concurrently in 5G discussions, network slicing is, in fact, an architecture paradigm that can exist outside of 5G and provide immense value for service providers in terms of efficient implementation of value-added services that can be monetized as revenue.

Dedicated Virtual Networks

Network slicing aims to isolate specific application traffic into a dedicated virtual network, whereby each slice carries specific application traffic such as IoT Telemetry or Automotive. Having an isolated virtual network enables different use cases to have unique network characteristics to a diverse end-user community. It also provides an opportunity to match allocated resources for the slice to expected usage patterns and specific value-points of the end-user services.

An example of a slicing application is telemetry sensors. Telemetry sensors that are required to send data every 12 hours may settle for high latency values, low bandwidth, and centralized compute services in the cloud. An industrial IoT which controls the manufacturing floor will require low latency and local compute with high-bandwidth at the far edge. In this case, building a network which is required to share both of the services will not be efficient and will create unbalanced costs. Imagine if you had to build an 8 lane high-way and let bicyclists ride it occasionally!

Cyclists vs. Autos

But with network slicing, the service provider can offer a different connectivity based on a dedicated slice, which ensures the service offerings do not overlap. In our example, that would be one road crafted only for cyclists and a different road for autos. Having a dedicated slice (e.g. road) can keep costs and expected revenues better aligned; for example, we assume in our analogy that a truck driver will pay more compared to a motorcyclist.

With respect to slicing implemented around the topic of network security in particular, service providers can offer a security posture that gives them the best chance to keep costs in check while keeping the network safe and affordable to operate.

For more information on this, come hear Radware’s Eyal Yaron speak at 5G World Congress in ExCeL, London on June 12. Details for Eyal’s panel can be found here.

Read “Creating a Secure Climate for your Customers” today.

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5G Security in an API-Driven Economy

May 15, 2019 — by Travis Volk — 0

Over the last six years, solution architects have been designing the transformation of Service Provider’s networks to significantly reduce the timing of service and feature deployment lifecycles, standardizing on real-time service provisioning, consumption and end user autonomy. This challenge has been in parallel to delivering highly scalable and cost effective solutions.

These solutions, along with automation, are addressing emerging security challenges while extending tailored outcomes to individual lines of business and customers. The result is better security, user experiences and a broader addressable market.

So how does this hard work improve our execution of 5G transformations?

All About Those Apps

First, the fully automated software delivery model allows us to address the complexity of a widely distributed architecture in a repetitive model. Network and security alignment improves resource allocation while optimizing consumption-based delivery from edge systems.

The “edge” may have more than one meaning in this discussion, as service delivery platforms are no longer constrained to a single autonomous system. This flexibility leads Service Providers to a new era of content management and monetization as applications are deployed across numerous computing platforms to minimize latency.

It is important to appreciate that these capabilities are all made possible because of application-to-application dialog that transpire over APIs. Traditionally, application and API exposure had been constrained to IDC infrastructure. This meant that a secure DC or security gateway framework was used to harden the exposure of numerous applications in the same physical location. All of these applications communicated to the internet via a common path. In the scope of security design, this was a relatively easy problem to address.

Now, take a step back to the previous ideology of 5G and it jumps out at you that API and application protections become a key component in modern edge security.

From Security Zones to Network Slices

It is also interesting to recognize that traditional volumetric defense for infrastructure protection is changing rapidly.

Anomalous traffic easily evading netflow detection has been eroding precious core resources for too long. When security functions are built into the network, attacks are automatically addressed locally, avoiding back-hauling attacks and driving efficiency back into the core. This highly scalable infrastructure protection strategy also serves as a point of escalation for more sophisticated or persistent attacks seen in gateways, applications and APIs.

As we transition from security zones to network slices, this multi-tiered approach further lends itself to the decomposition of highly intelligent machine learning algorithms deployed contextually for the relevant protocols and applications.

As an example, IoT anomaly detection on the access edge requires very different algorithms than used for detecting attacks from the internet thru the peering edge. When we speak about application and API protection, protecting a mobile application requires entirely different techniques than addressing behavioral analysis for fraudulent account abuse. Having the ability to protect, adapt and optimize attack lifecycle management in cooperation with the orchestration layer for end-to-end security has been our greatest achievement in modern security design.

The Modern Landscape

Maybe the punchline is becoming obvious at this point but addressing end-to-end security with the ability to escalate application abuse to the edge of the system in a widely distributed architecture has become a modern landscape requirement.

Automation is working on our behalf to drive agility into engineering, provisioning, billing and operations. With predefined workflows, analysts enjoy alert-driven processes and/or fully automated protection strategies designed to meet the high availability demands throughout a complex system.

If you track my work at all, you will appreciate that I have dedicated the last twenty years designing highly adaptive services. If you are curious how you too can maximize security revenue across multiple lines of business, please reach out in the comment section below; service creation is one of my favorite points of discussion.

Read “Creating a Secure Climate for your Customers” today.

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The Necessary Burden of 5G Security

May 14, 2019 — by Eyal Yaron — 0

Today’s infrastructure threats will have major impacts on tomorrow’s 5G commercial networks. 5G network slicing, virtualization and disaggregation introduce new levels of complexity to network security, requiring a high-level of automation in security on-boarding, scale-out and attack mitigation.

5G security is absolutely required to be thought about in a Day 1 network build and ‘weaved’ into the network architecture. Otherwise, the immense job of re-architecting the network afterward will be a cost-prohibitive exercise.

Service providers are faced with a necessary burden of managing security threats in the 5G network.

Your ‘Typical’ Security Solution

A typical network security solution will include several security elements, such as firewalls, DDoS protection devices, IPS/IDS, etc. Each system may require its own domain expertise when it comes to proper configuration and tuning. When a carrier-grade network slice is under attack, dedicated expertise is required for handling changes and setting the proper mitigation actions. With the new paradigm of 5G network slicing coming onto the scene in a highly distributed network, carrier security teams will be challenged.

Service providers are already in a precarious position of creating healthy profit margins with the onslaught of over-the-top data and video traversing their networks. New revenue streams are tough to come by, and so the other lever available to influence margins is cost control. However, the cost economics do not scale well when contemplating an increase in security staff to prepare for 5G. The new attack vectors are just too complex and too high in volume to adequately address with a bloated Security Operations Center (SOC) of just human oversight and management.

Stronger Visibility

What makes more sense is adoption of a comprehensive security solution used across all network slices to benefit from ease of management and SOC skill sets.

Vendor technology designed around the concept of self-learning with respect to threat detection not heavily dependent on pre-configured rules is the ideal toolkit for service providers. Minimal setup and configuration lower the overall carrier security team effort around system operation. Now, instead of manual provisioning and troubleshooting, the SOC specialist can look at a dashboard to see what was detected by the system and what mitigation actions took place to defend against malicious threats to the system. This yields strong visibility into network security threats across all network functions and slices.

In the new 5G security play, the various security functions are on-boarded per slice in alignment to the required network capabilities and desired distribution. The total investment in security computing resources and licenses aligned with the network slice investment allowing carrier better control on the risks and the costs associated with specific network slice.

Automated attack mitigation capabilities provide the security team with ‘peace of mind’ that all ‘war time’ actions are taken care of in automated manner with no manual intervention by security administrators.

So although 5G carries with it very challenging security issues, service providers can be proactive in creating a security posture that gives them the best chance to keep costs in check while keeping the network safe.

Read “Creating a Secure Climate for your Customers” today.

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5G: You Can Have Your Slice and Security Too!

April 25, 2019 — by Louis Scialabba — 1

We have heard it before. Another generation of mobile architecture is upon us and we are euphoric for all the cool things we can do more of. And of course good marketers will swear that you can lasso the moon if you have enough money to pay for it.

Let’s inspect 5G for what it really is, save the hype. It is an upgrade in the mobile architecture that pushes new computing elements and services closer to the edge in order to scale and improve network performance. The 5G specifications rely on virtualized and distributed network functions that span across remote locations, and is heavily dependent on robust, secure interworking between remote and local virtualized network functions.

5G also opens the network to new services using IT protocols and Open APIs – the latter of which introduces significant additional liability on the responsibility of the carrier network security owner.

I’ll Take a Slice of That

The “Network Slicing” concept in 5G aims to isolate specific application traffic into a dedicated virtual network. Each slice carries the traffic originating from a specific application, such as IoT Telemetry and Autonomous Vehicles, Smart City and Smartphone. Each application has its unique network traffic pattern and requires specific security policies. Having an isolated virtual networks brings security benefit and limits security risk impact to the specific slice.

Sharpening the Edge

With this new network paradigm based on service-based architecture (SBA), the previous 3G and 4G network element boxes transformed into a cloud of micro-services functions, distributed and disaggregated based on the carrier coverage needs and specific applications deployed in the carrier network. The new architecture exposes many internet interfaces in various network segments from the core peering link up to the far-edge compute to address scale and low-latency requirements.

Such mass exposure of external internet interfaces significantly raises the cyber security threat level. IoT and its applications running at the far edge provides new services based on vast usage of open, published interfaces based on HTTP\2. On one hand, this enables openness and service agility, and on the other, extensive exposure to attacks tools and tactics using publicly available information to wreak havoc on network infrastructure and services.

In other words, the new 5G security perimeter has widened and expanded far beyond what we are familiar with in LTE and 3G world.

A Call to Arms

A typical network security solution will include various security elements such as firewalls, DDoS protection, web application firewall, etc. Each system may require its own domain expertise when it comes to proper configuration and tuning. When a carrier network is under attack, dedicated expertise is required for handling changes and setting the proper mitigation action.

With the new reality of network slicing and highly distributed network functions carrier security teams will be overburdened unless they employ an automated, self-learning defense mechanism. With the current telecom carriers, the economics of an increase in security staff is not an option when moving toward 5G – it just doesn’t scale from a cost-perspective and it puts human engineers at a disadvantage to ever-increasing machine-based bot attacks.

Automation as Table Stakes

A comprehensive security solution used across all network slices benefit from ease of management and required team expertise. Security vendors must design security products around the concept of self-learning, which is essentially threat detection not heavily dependent on pre-configured rules.

Minimal setup and configuration is required in 5G to lower carrier security team effort around system operation. An automated attack mitigation capability provides security teams with ‘peace of mind’ that all attack time actions taken care without manual intervention by security administrators, with strong visibility into network security threats across all network functions and slices.

Read “Creating a Secure Climate for your Customers” today.

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Out of the Shadows, Into the Network

April 9, 2019 — by Radware — 1

Network security is a priority for every carrier worldwide. Investments in human resources and technology solutions to combat attacks are a significant part of carriers’ network operating budgets.

The goal is to protect their networks by staying a few steps ahead of hackers. Currently, carriers may be confident that their network security solution is detecting and mitigating DDoS attacks.

All the reports generated by the solution show the number and severity of attacks as well as how they were thwarted. Unfortunately, we know it’s a false sense of well-being because dirty traffic in the form of sophisticated application attacks is getting through security filters. No major outages or data breaches have been attributed to application attacks yet, so why should carriers care?

Maintaining a Sunny Reputation

The impact of application attacks on carriers and their customers takes many forms:

Service degradation
Network outages
Data exposure
Consumption of bandwidth resources
Consumption of system resources

A large segment of carriers’ high-value customers have zero tolerance for service interruption. There is a direct correlation between service outages and user churn.

Application attacks put carriers’ reputations at risk. For customers, a small slowdown in services may not be a big deal initially. But as the number and severity of application attacks increase, clogged pipes and slow services are not going to be acceptable. Carriers sell services based on speed and reliability. Bad press about service outages and data compromises has long-lasting negative effects. Then add the compounding power of social networking to quickly spread the word about service issues, and you have a recipe for reputation disaster.

Always Under Attack

It’s safe for carriers to assume that their networks are always under attack. DDoS attack volume is escalating as hackers develop new and more technologically sophisticated ways to target carriers and their customers In 2018, attack campaigns were primarily composed of multiple attacks vectors, according to the Radware 2018–2019 Global Application & Network Security Report.

The report finds that “a bigger picture is likely to emerge about the need to deploy security solutions that not only adapt to changing attack vectors to mitigate evolving threats but also maintain service availability at the same time.”

Attack vectors include:

SYN Flood
UDP Flood
DNS Flood
HTTP Application Flood
SSL Flood
Burst Attacks
Bot Attacks

Attackers prefer to keep a target busy by launching one or a few attacks at a time rather than firing the entire arsenal all at once. Carriers may be successful at blocking four or five attack vectors, but it only takes one failure for the damage to be done.

Read “Creating a Secure Climate for your Customers” today.

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Are Connected Cows a Hacker’s Dream?

April 3, 2019 — by Mike O'Malley — 0

Humans aren’t the only ones consumed with connected devices these days. Cows have joined our ranks.

Believe it or not, farmers are increasingly relying on IoT devices to keep their cattle connected. No, not so that they can moo-nitor (see what I did there?) Instagram, but to improve efficiency and productivity. For example, in the case of dairy farms, robots feed, milk and monitor cows’ health, collecting data along the way that help farmers adjust techniques and processes to increase milk production, and thereby profitability.

The implications are massive. As the Financial Times pointed out, “Creating a system where a cow’s birth, life, produce and death are not only controlled but entirely predictable could have a dramatic impact on the efficiency of the dairy industry.”

From Dairy Farm to Data Center

So, how do connected cows factor into cybersecurity? By the simple fact that the IoT devices tasked with milking, feeding and monitoring them are turning dairy farms into data centers – which has major security implications. Because let’s face it, farmers know cows, not cybersecurity.

Indeed, the data collected are stored in data centers and/or a cloud environment, which opens farmers up to potentially costly cyberattacks. Think about it: The average U.S. dairy farm is a $1 million operation, and the average cow produces $4,000 in revenue per year. That’s a lot at stake—roughly $19,000 per week, given the average dairy farm’s herd—if a farm is struck by a ransomware attack.

It would literally be better for an individual farm to pay a weekly $2,850 ransom to keep the IoT network up. And if hackers were sophisticated enough to launch an industry-wide attack, the dairy industry would be better off paying $46 million per week in ransom rather than lose revenue.

5G Cows

Admittedly, connected cows aren’t new; IoT devices have been assisting farmers for several years now. And it’s a booming business. Per the FT, “Investment in precision ‘agtech’ systems reached $3.2bn globally in 2016 (including $363m in farm management and sensor technology)…and is set to grow further as dairy farms become a test bed for the wider IoT strategy of big technology companies.”

But what is new is the rollout of 5G networks, which promise faster speeds, low latency and increased flexibility—seemingly ideal for managing IoT devices. But, as we’ve previously discussed, with new benefits come new risks. As network architectures evolve to support 5G, security vulnerabilities will abound if cybersecurity isn’t prioritized and integrated into a 5G deployment from the get-go.

In the new world of 5G, cyberattacks can become much more potent, as a single hacker can easily multiply into an army through botnet deployment. Indeed, 5G opens the door to a complex world of interconnected devices that hackers will be able to exploit via a single point of access in a cloud application to quickly expand an attack radius to other connected devices and applications. Just imagine the impact of a botnet deployment on the dairy industry.

I don’t know about you, but I like my milk and cheeses. Here’s to hoping dairy farmers turn to the experts to properly manage their security before the industry is hit with devastating cyberattacks.

Read “Creating a Secure Climate for your Customers” today.

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Here’s How Net Neutrality & Wearable Devices Can Impact 5G

March 28, 2019 — by Mike O'Malley — 0

AT&T and Verizon are committed to an aggressive, multi-city roll out plan in a race to be the first carrier to implement national 5G deployment. We see this competition play out almost daily in the news: AT&T’s “5G E” is slower than Verizon 4G, Verizon declares 5G war on AT&T, Verizon inks a deal with the NFL to bring 5G to stadiums, and so forth. And yet, despite this newsworthy competition between telecom giants, we still have a limited understanding of the benefits and risks of 5G.

There are the obvious benefits – faster service, for one – and risks, like insufficient security infrastructure. But what about other, less considered factors that can impact 5G (both positively and negatively), such as net neutrality and wearable devices? How do they play into the risks and rewards of this communications (r)evolution?

Net Neutrality

Currently, net neutrality in the U.S. is embroiled in partisan politics and it’s unclear whether these regulations will be reinstated. But operating under the current status, in which net neutrality rules are suspended, service providers stand to profit from 5G.

As we’ve previously discussed, 5G allows for service providers to “slice” portions of a spectrum as a customizable service for specific types of devices and different customer segments—and without net neutrality, carriers can conceivably charge premium rates for higher quality of service. In other words, service providers could profit by charging select industries that require large bandwidth and low latency – like healthcare and manufacturing, for example – higher premiums.

This premium service/premium revenue model represents a significant ROI for carriers on their 5G infrastructure investment. Not only does slicing provide flexibility for multi-service deployment, it enables the realization of diverse applications on that physical resource, which helps recoup cost for the capital investment.

However, because implementation will be patchy, with initial focus on high-density, urban areas (versus rural populations), the so-called digital divide may very well deepen, not just for consumers but for rural industries like healthcare and agriculture as well.

Wearable Devices

IoT devices have outpaced the human population for the first time in history. And 5G will undoubtedly fan the flames of interest in wearable devices, due to its projected speed and availability of data.

While these devices can certainly make life easier, and even potentially healthier (think about the ECG app on the Apple Watch!), they also carry enormous risk. Why? Because they’re hackable – and they contain a treasure trove of sensitive data, like your location, health stats, and more. And the risk doesn’t only impact the individual wearing an IoT device; enterprises are likewise at risk when their employees wear devices at work and transmit data over office WiFi.

What’s Next?

With the ever-changing nature of internet regulations and the explosion of wearable devices, security must be top-of-mind for service providers. Not only is security advantageous to end users, but for the carriers as well; best-of-breed security opens the possibility for capturing new revenue streams.

No matter the complexity of securing 5G networks, there are solutions. For example, service providers should consider differentiated security mechanisms, offering security as a service to vertical industries, and segregating virtual network slices to safeguard their networks. And of course, let the (security) experts help the (carrier) experts.

Read “Creating a Secure Climate for your Customers” today.

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Here’s How Carriers Can Differentiate Their 5G Offerings

February 28, 2019 — by Mike O'Malley — 0

Much of the buzz surrounding this year’s Mobile World Congress has focused on “cool” tech innovations. There are self-driving cars, IoT-enhanced bee hives, smart textiles that monitor your health, realistic human chatbots, AI robots, and so forth. But, one piece of news that has flown relatively under the radar is the pending collaboration between carriers for 5G implementation.

A Team Effort

As Bloomberg reported, carriers from Vodafone Group Plc, Telecom Italia SpA and Telefonica SA are willing to call “a partial truce” to help each other build 5G infrastructure in an attempt “to avoid duplication and make scarce resources go further.”

Sounds great (who doesn’t love a solid team effort?!)…except for one thing: the pesky issue of competing for revenue streams in an industry fraught with financial challenges. As the Bloomberg article pointed out, “by creating more interdependent and overlapping networks, the risk is that each will find it harder to differentiate their offering.”

While this is certainly a valid concern, there is an obvious solution: If carriers are looking for differentiation in a collaborative environment, they need to leverage security as a competitive advantage.

Security as a Selling Point

As MWC19 is showing us in no uncertain terms, IoT devices—from diabetic smart socks to dairy milking monitors—are the way of the future. And they will largely be powered by 5G networks, beginning as early as this year.

Smart boot and sock monitor blood sugar, pulse rate, temperature and more for diabetics.

Which is all to say, although carriers are nervous about setting themselves apart while they work in partnership to build 5G infrastructure, there’s a huge opportunity to differentiate themselves by claiming ownership of IoT device security.

As I recently wrote, IoT devices are especially vulnerable because of manufacturers’ priority to maintain low costs, rather than spending more on additional security features. If mobile service providers create a secure environment, they can establish a competitive advantage and reap financial rewards.

Indeed, best-of-breed security opens the possibility for capturing new revenue streams; mobile IoT businesses will pay an additional service premium for the peace of mind that their devices will be secure and can maintain 100% availability. And if a competing carrier suffers a data breach, for example, you can expect their customer attrition to become your win.

My words of advice: Collaborate. But do so while holding an ace—security—in your back pocket.

Read “Creating a Secure Climate for your Customers” today.

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Securing the Customer Experience for 5G and IoT

February 21, 2019 — by Louis Scialabba — 0

5G is set to bring fast speeds, low latency and more data to the customer experience for today’s digitized consumer. Driven by global demand for 24×7 high-speed internet access, the business landscape will only increase in competitiveness as service providers jockey to deliver improved network capabilities.

Although the mass roll-out of the cutting-edge technology is expected around 2020, the race to 5G deployment has already begun. In addition to serving as the foundation for the aforementioned digital transformation, 5G networks will also deliver the integral infrastructure required for increased agility and flexibility.

But with new benefits come new risks. As network architectures evolve to support 5G, it will leave security vulnerabilities if cybersecurity isn’t prioritized and integrated into a 5G deployment from the get-go to provide a secure environment that safeguards customers’ data and devices.

Cybersecurity for 5G shouldn’t be viewed as an additional operational cost, but rather as a business opportunity/competitive differentiator that is integrated throughout the overall architecture. Just as personal data has become a commodity in today’s world, carriers will need the right security solution to keep data secure while improving the customer experience via a mix of availability and security.

For more insight into how service providers can mitigate the business risks of 5G deployment, please read our white paper.

Read “Creating a Secure Climate for your Customers” today.

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The End of the Telephone

November 20, 2018 — by David Hobbs — 1

Telephones have come a long way in their short lives, evolving from a simple transmitter and receiver to today’s ubiquitous smartphones. But as technologies continue to consolidate and automation takes over, what are we going to do at the end of the telephone? And what are the security implications of that?

Imagine a world where phone numbers have no meaning, and we instead rely on a system resembling an Internet IP address that shifts according to location. Afterall, we’re increasingly using smartphone apps like WhatsApp, iMessage, FaceTime, Skype (and so many more!) to communicate. How often do we actually dial our friends and family to talk? Moreover, how many of us still even own landlines?!

The fact is, we, as a society, interact more and more via apps, and I predict that the end of POTS (Plain Old Telephone System) will come faster than you think. Even my ageing parents have disconnected their home phones and my 84-year-old father uses an iPhone!

So, with cybersecurity in mind, what does this new trend mean? Do we have ways to integrate our businesses into this new era? How do we keep our customers, friends and family connected, while keeping our data safe?

The reliance on chat apps is beneficial in that it helps avoid international call charges and allows us to be global citizens without boundaries imposed by phone companies. But it also opens us up to vulnerabilities, like potentially communicating and exchanging sensitive data with the wrong person(s). While two factor authentication—which is used, for example, when you log into a bank account from a public Internet device and the site confirms your identity via text or a call—works now, when phone numbers disappear, it won’t do any good.

This is where the future of innovation plays a critical role; we will need a new way to identify and connect with people beyond face recognition, fingerprints on an iPhone or a password generated by a system. For example, 5G networks allow for the design of software defined private networking and the ability to provide function virtualization. We should begin to see full security stack solutions at the endpoint of radio /5G /WiFi, without security having to live in the central office.

Look forward to the future where trust and identity are going to be better than some sort of robot speak of numbers and data on the screen.

Read “Radware’s 2018 Web Application Security Report” to learn more.

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Older Posts

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Dedicated Virtual Networks

Cyclists vs. Autos

Read “Creating a Secure Climate for your Customers” today.

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All About Those Apps

From Security Zones to Network Slices

The Modern Landscape

Read “Creating a Secure Climate for your Customers” today.

Share this:

Your ‘Typical’ Security Solution

Stronger Visibility

Read “Creating a Secure Climate for your Customers” today.

Share this:

I’ll Take a Slice of That

Sharpening the Edge

A Call to Arms

Automation as Table Stakes

Read “Creating a Secure Climate for your Customers” today.

Share this:

Maintaining a Sunny Reputation

Always Under Attack

Read “Creating a Secure Climate for your Customers” today.

Share this:

From Dairy Farm to Data Center

5G Cows

Read “Creating a Secure Climate for your Customers” today.

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Net Neutrality

Wearable Devices

What’s Next?

Read “Creating a Secure Climate for your Customers” today.

Share this:

A Team Effort

Security as a Selling Point

Read “Creating a Secure Climate for your Customers” today.

Share this:

Read “Creating a Secure Climate for your Customers” today.

Share this:

Read “Radware’s 2018 Web Application Security Report” to learn more.

Share this: