Protect network infrastructure with firewalls, intrusion detection, segmentation, monitoring, and access controls to prevent unauthorized access and data theft.
Orion IT Service Team
May 10, 2026
Network infrastructure is the foundation of business operations. Every application, every user, every device depends on network availability and security. Network attacks can disrupt operations, steal data, or provide entry points for attackers. Network security requires multiple layers of protection—firewalls, intrusion detection, segmentation, monitoring, and access controls work together to protect infrastructure.
Effective network security combines technology, architecture, and monitoring to prevent, detect, and respond to threats.
Firewalls control traffic entering and leaving your network based on configured rules. They block unauthorized access and allow legitimate traffic. Modern firewalls go beyond simple packet filtering to inspect application layer traffic, detect intrusions, and block malware. Firewalls should be configured with default-deny rules that allow only necessary traffic.
Use next-generation firewalls (NGFW) that provide application awareness, intrusion prevention, and threat detection. Redundant firewalls with failover provide high availability. Firewalls should be regularly updated with threat signatures and patches.
Network segmentation divides your network into smaller zones with firewalls controlling traffic between zones. Segment by function—separate servers from user workstations, separate sensitive systems from general systems. Segment by sensitivity—isolate systems handling sensitive data. Segment by compliance—separate HIPAA systems from others, separate PCI systems from others.
Segmentation limits lateral movement. If an attacker compromises a system in one segment, firewalls prevent them from moving freely to other segments. This dramatically reduces breach impact.
Intrusion detection systems (IDS) monitor network traffic for suspicious patterns and alert security teams. Intrusion prevention systems (IPS) go further and block suspicious traffic automatically. IDS/IPS use signature detection that recognizes known attacks and behavior analysis that detects unusual patterns.
Network-based IDS/IPS monitors traffic on the network. Host-based IPS monitors traffic on individual systems. Deploy both for comprehensive coverage.
Network monitoring provides visibility into what's happening on your network. Collect logs from firewalls, routers, switches, and servers. Use SIEM (Security Information and Event Management) systems to aggregate logs, detect patterns, and alert on suspicious activity. Monitor for unusual traffic patterns, connections to suspicious destinations, data exfiltration, and protocol violations.
Maintain centralized logging with long-term retention for forensics and compliance audits.
Users and applications should have minimal network access needed to perform their functions. If a user doesn't need access to a particular server, block it. If an application only needs to communicate with specific systems, restrict it to those systems. Use network access control (NAC) systems to verify device compliance before allowing network access.
Key Takeaway
Network security requires layered defenses including firewalls, intrusion detection, segmentation, monitoring, and access controls working together to prevent, detect, and respond to threats.
Strengthen Your Network Security