Every network is under constant probing – automated scans, phishing attempts, and opportunistic attacks looking for a way in. What stands between that activity and a breach is a layered set of network security measures, each designed to catch what the others might miss.
Cyber threats have increased by 17% in 2026, with businesses facing 2,090 attacks every week.1 That's why layered defenses matter. The faster your team can detect and respond to threats, the less time attackers have to move through your environment.
In this guide, we'll break down what network security controls are, walk through the basic types every organization should have in place, and share a checklist you can use to evaluate your own environment.
What Are Network Security Controls?
Network security controls are the tools, technologies, and policies used to protect the confidentiality, integrity, and availability of data as it moves across and resides within a network. They're typically grouped into three categories:
- Technical Controls: These are the tools that actively monitor, filter, and block threats in real time, including firewalls, encryption, intrusion detection, endpoint protection, and SIEM platforms.
- Administrative Controls: These define who can access what, how systems should be configured, and what everyone should do when a threat is detected – policies, training, access governance, and incident response planning.
- Physical Controls: These measures ensure attackers can't simply walk into your facilities and plug directly into systems, such as locked server rooms, access badges, surveillance, and other measures that prevent unauthorized physical access to infrastructure.
The purpose of network security measures is layered defense – often called defense in depth – so that if one control fails, others are in place to catch the threat.
10 Types of Network Security Controls
These are the foundational types of network security controls that make up a comprehensive defense strategy.
1. Firewalls
Firewalls are still the first line of defense. They filter traffic between trusted internal networks and untrusted external ones based on the security rules your team defines. Next-generation firewalls (NGFWs) add deep packet inspection, application awareness, and integrated threat intelligence to traditional port and protocol filtering.
2. Endpoint Protection
Every network-connected device is a potential entry point – and with the number of connected IoT devices expected to reach 39 billion by 2030,1 securing these entry points is essential. Endpoint protection platforms combine anti-malware, behavioral monitoring, and automated response to secure laptops, servers, and mobile devices, extending network security to the device level.
3. Network Segmentation
Segmentation divides a network into smaller zones, limiting how far an attacker can move if they gain access to one part of the environment. Well-designed segmentation confines a breach to a small area rather than allowing lateral movement across your entire infrastructure.
4. Intrusion Detection and Prevention Systems (IDS/IPS)
IDS platforms monitor network traffic for suspicious patterns and alert your team whenever something looks wrong. IPS tools go a step further, automatically blocking traffic that matches known attack signatures or anomalous behavior. Together, they provide both visibility and automated response.
5. Virtual Private Networks (VPNs) and Encryption
VPNs create encrypted tunnels for remote users and site-to-site connections, which protect data in transit from interception. When data is encrypted in transit and at rest, attackers can’t read it without the proper keys – even if it’s intercepted or storage is compromised.
6. Access Control and Identity Management
Access control ensures users and systems only have the permissions necessary for their role. Modern identity and access management (IAM) platforms add multi-factor authentication, single sign-on, and centralized governance across every application and system.
7. Data Loss Prevention (DLP)
DLP tools monitor and control the movement of sensitive data, preventing it from leaving the network through unauthorized channels – whether that's email, cloud uploads, or removable media. This is particularly important for organizations handling regulated data.
8. Email Security
According to Mimecast’s recent The State of Human Risk report, 96% of IT leaders expect email security challenges in 2026.2 Phishing remains one of the most common attack vectors, which makes email security – spam filtering, attachment scanning, link protection, and DMARC/SPF/DKIM authentication – an essential network security measure rather than an afterthought.
9. Security Information and Event Management (SIEM)
SIEM platforms aggregate logs and security events from across your environment, correlating them to detect patterns that individual tools would miss. SIEM is what turns isolated alerts into actionable, prioritized intelligence for your security team.
10. Patch and Vulnerability Management
Unpatched software is consistently one of the most exploited weaknesses in any environment. Systematic patch management combined with regular vulnerability scanning closes known gaps before attackers can take advantage of them.
Network Security Controls Checklist
Use this network security controls checklist as a starting point for evaluating your current environment:
- Do you have a next-generation firewall actively managed and updated?
- Is your network segmented to limit lateral movement?
- Do you have IDS/IPS monitoring for suspicious activity in real time?
- Are all remote connections encrypted through a VPN or equivalent secure access solution?
- Is multi-factor authentication enforced across all critical systems?
- Are endpoints protected with modern, behavior-based security tools?
- Is email security actively filtering phishing and malicious attachments?
- Do you have DLP controls in place for sensitive data?
- Is a SIEM platform aggregating and correlating security events?
- Is patch management systematic, documented, and current?
If you answered "no" or "not sure" to more than a couple of these, that's a sign your environment may have gaps worth addressing.
Types of Data Security Measures vs. Network Security Measures
It's worth distinguishing network security from data security, since the two overlap but aren't identical.
Network security measures focus on protecting the infrastructure that data travels across and resides within – firewalls, segmentation, and monitoring at the network layer.
Types of data security measures, like encryption, tokenization, data classification, access controls tied to data sensitivity, and backup and recovery processes, focus on the data itself regardless of where it lives.
A complete security program needs both. Network controls without strong data security leave sensitive information exposed even within a well-defended network. Data security without network controls leaves the infrastructure vulnerable to the attacks that put data at risk in the first place.
At Aseva, we design our managed network security and broader cybersecurity services to address both layers together, rather than treating them as separate initiatives.
Other Types of Security Measures
Beyond the technical controls above, a complete security posture includes administrative and physical types of security measures: documented security policies, regular employee security awareness training, incident response planning, and physical safeguards for on-premises infrastructure. Technology alone doesn't secure an organization – people and process matter just as much.
Network Security Controls Examples in Action
Still not sure why network security is important for your organization? Consider a phishing email reaching an employee's inbox. If it gets through:
- MFA can stop the attacker from logging in with just a stolen password
- Endpoint protection can block a malicious attachment from executing
- Segmentation can limit what the attack can reach, even if they gain access
- SIEM correlates the anomaly with other signals to trigger an alert
Each of these controls is a layer – and the layering is what separates a contained incident from a full breach.
Build a Layered Security Strategy With Aseva
No single tool provides complete protection. The organizations with the strongest security postures are the ones that layer multiple controls together, matched to their specific risk profile and infrastructure – and that keep evaluating and updating those controls as threats evolve.
At Aseva, we take a vendor-agnostic approach to building your cybersecurity strategy. We're not tied to a single firewall vendor or security platform – we work with leading providers across the market and bring our own certified engineers and network expertise to design, implement, and manage the controls that actually fit your environment. If you're not sure where your gaps are, we can help you find out.
Get started today to speak with one of our security experts and build a network security strategy that actually holds up.
Sources:
