Skill Profile

Network Security

Cybersecurity

"The observable action of designing, configuring, and monitoring network infrastructure to prevent unauthorised access, detect malicious traffic, and contain the blast radius of security incidents — through firewall rules, network segmentation, traffic monitoring, and access controls."

YOUR SKILLS

Problems This Skill Solves

Lateral movement by attackers who have compromised one system and are seeking to reach others — network segmentation and micro-segmentation limits the attacker's ability to move between systems, containing the breach to the initially compromised segment.
Malicious traffic entering or leaving the network undetected — firewall rules, IDS/IPS signatures, and proxy filtering block or alert on known malicious traffic patterns at the network perimeter and between internal segments.
Unauthorised access to network resources by users or devices that should not have access — network access control (NAC), 802.1X authentication, and VPN enforcement ensures only authorised, compliant devices can connect to the network.
Unencrypted traffic exposing sensitive data to interception — enforcing TLS for web traffic, IPSEC for VPN connections, and encrypted protocols for internal service communication ensures data in transit cannot be read if intercepted.

Tools Used

Firewalls: Palo Alto Networks, Fortinet FortiGate, Cisco Firepower — for perimeter and internal traffic control IDS/IPS: Snort, Suricata, Palo Alto Threat Prevention — for detecting and blocking malicious network traffic Network monitoring: Wireshark, Zeek (Bro), NetFlow analysis tools — for packet capture and traffic analysis SIEM integration for network device log analysis (firewall logs, DNS logs, proxy logs)Zero Trust Network Access (ZTNA) platforms: Zscaler, Cloudflare Access — for replacing perimeter-based VPN with identity-aware access control

Roles That Use This Skill

1 total · 1 industry

Specialist

This skill is concentrated in one industry.

Cybersecurity / Technology / Finance

Cybersecurity Analyst

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Myths vs Truths

Myth

"The firewall is the security perimeter — if you have a firewall, your network is secure."

Truth

The firewall perimeter model was designed for an era when all users were inside the network and all threats came from outside. Modern attacks exploit legitimate user credentials, compromise trusted internal systems, and arrive through channels the firewall cannot inspect (encrypted traffic, cloud services, personal devices). Zero Trust architecture — which assumes breach and requires continuous verification regardless of network location — is replacing the perimeter model in modern security design.

Research & Outlook

Cloud adoption is dissolving the traditional network perimeter — as workloads move to AWS, Azure, and SaaS applications, the concept of a definable network edge becomes increasingly obsolete. Zero Trust Network Access (ZTNA) and Secure Access Service Edge (SASE) architectures are replacing VPN and perimeter firewall models. Network security engineers are increasingly working in cloud-native environments where network security is defined through software policy rather than hardware appliances.

See This Skill In Action

Watch a professional demonstrate Network Security in a real working environment — what it looks like, how it's applied, and why it matters.

Network Security in practice

A professional demonstrates this skill on the job

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Cybersecurity

Network Security

1role unlocks with this skill

Also Known As

Network DefenceNetwork ProtectionFirewall ManagementNetwork MonitoringPerimeter Security

Connected Skills

Threat Detection & Analysis Vulnerability Assessment Security Frameworks (ISO 27001/NIST)SIEM Cloud Security

Growth Path

Beginner

Understands the OSI model and TCP/IP protocol stack at a level sufficient to interpret network security alerts. Reads and interprets firewall rule sets. Captures and analyses basic network traffic using Wireshark. Identifies common network attack patterns in log data.

Intermediate

Designs and implements network segmentation to limit lateral movement risk. Configures firewall policies and IDS/IPS rules for a defined network architecture. Investigates network-based security incidents using log analysis and packet capture. Implements VPN and network access control for remote access.

Expert

Designs enterprise network security architecture — zero trust segmentation, SD-WAN security, cloud network security (AWS VPC, Azure vNet), and hybrid network security controls. Leads network security incident response. Contributes to security architecture reviews for major infrastructure changes. Develops network security standards and baselines for the organisation.

How to Practise

1.Set up a home lab network with a pfSense or OPNsense firewall — configure firewall rules, enable IDS, and analyse the logs to understand what traffic your devices generate.
2.Use Wireshark to capture and analyse network traffic on a test network — practise identifying protocol types, spotting unencrypted credentials, and recognising malicious traffic patterns.
3.Complete the TryHackMe "Pre-Security" or "SOC Level 1" path — covering network fundamentals and network security monitoring in a guided, practical format.
4.Study common network attack techniques (ARP poisoning, DNS spoofing, VLAN hopping, MITM) and understand what network controls prevent each one.

How to Prove

·CompTIA Network+ and Security+ certifications — foundational credentials covering network security concepts and implementation.
·Cisco CCNA Security or CCNP Security — vendor-specific certifications for Cisco network security implementation.
·GIAC GPEN or GWAPT — for offensive network security skills (penetration testing).
·Network security engineer employment record — demonstrating live responsibility for firewall management, network monitoring, or security architecture.