Network Detection and Response (NDR): A Buyer’s Guide for Australian Security Leaders

Network detection and response (NDR) monitors network traffic to catch threats that firewalls and endpoint tools miss, including attacker movement inside your network. For Australian organisations facing rising cybercrime costs, it is the third pillar of what Gartner calls the SOC visibility triad, alongside endpoint detection (EDR) and log analysis (SIEM). This guide explains what NDR does, how it compares to EDR, XDR and SIEM, how it supports Australian compliance, and how to choose a provider.

What is network detection and response (NDR)?

NDR is a security capability that continuously analyses network traffic to detect threats through behaviour rather than known signatures. It watches internal, encrypted and east-west traffic (the movement between systems inside your network), and flags activity that looks like an intrusion even when no malware file is involved.

How NDR works

NDR uses network sensors to capture packet and flow metadata, then applies behavioural analytics and machine learning to establish what normal looks like. When traffic deviates, for example a workstation suddenly scanning internal servers, it raises a scored detection. Sensors sit out of band, so there is nothing to install on endpoints.

What NDR detects that firewalls and EDR miss

Firewalls control traffic at the perimeter and EDR watches endpoints. Neither sees an attacker moving laterally between systems using stolen credentials and legitimate tools. NDR is built for exactly that: lateral movement, command and control, data exfiltration, credential abuse and anomalies in encrypted traffic.

Why NDR matters for Australian organisations now

The local threat picture is worsening. The ASD Annual Cyber Threat Report 2024-25 recorded more than 1,200 incidents the Australian Signals Directorate responded to, and around 84,700 cybercrime reports, roughly one every six minutes. The self-reported cost of cybercrime per report rose to $97,200 for medium businesses (up 55%) and $202,700 for large businesses (up 219%).

Attackers are increasingly getting in through the network edge. The Verizon 2025 Data Breach Investigations Report found exploitation of vulnerabilities was the initial access vector in 20% of breaches, concentrated on perimeter devices and VPNs, and that ransomware was present in 44% of breaches (rising to 88% among small and medium businesses). Once inside, attackers move laterally, and that is where network visibility earns its place.

NDR vs EDR vs XDR vs SIEM: the SOC visibility triad

These tools are complementary, not competing. Gartner describes NDR, EDR and SIEM as the SOC visibility triad, the combination that gives a security operations team comprehensive coverage.

• EDR watches endpoints (laptops, servers). Blind to devices that cannot run an agent.
• NDR watches the network, including unmanaged devices and east-west traffic. Blind to what happens entirely on an endpoint.
• SIEM aggregates and correlates logs from across the stack. Only as good as the logs it receives.
• XDR unifies signals across these layers into one detection and response workflow.

NDR fills the gap the other two leave: the traffic between systems, and the devices that never appear in an endpoint console.

NDR and Australian compliance

Network monitoring is not just good practice, it supports specific Australian obligations. The Essential Eight expects monitoring and timely response to incidents, which network-level detection directly supports. Organisations covered by the Security of Critical Infrastructure (SOCI) Act carry heightened expectations to detect and manage incidents affecting critical assets. And under the Privacy Act’s Notifiable Data Breaches scheme, faster detection shortens the window in which a breach goes unnoticed and unreported.

Managed NDR vs in-house: how to choose

NDR generates detections around the clock, and someone has to triage and act on them. That is the real build-versus-buy question.

Sensor placement and deployment

Sensors can be physical or virtual and are deployed out of band, so they do not sit in the traffic path or risk disruption. Placement decisions (perimeter, internal segments, cloud) determine what you can see.

Build versus buy

Running NDR in-house means staffing analysts to monitor it 24×7, which is difficult and expensive given the skills shortage. A managed service provides the platform and the analysts together. When network signals feed a 24×7 detection team, NDR becomes part of managed detection and response rather than another console nobody watches.

How to evaluate an NDR provider in Australia

• Coverage: can it see internal, encrypted and cloud traffic, not just the perimeter?
• Detection quality: behavioural analytics mapped to MITRE ATT&CK, with scored, prioritised alerts.
• Response: is monitoring backed by a local 24×7 team who investigate and act, or are you left with the alerts?
• Integration: does it work with your existing SIEM, SOAR, EDR and identity tools?
• Compliance: can it map detections to the frameworks you report against?
• Response readiness: is there a clear path from detection to incident response when something is confirmed?

It is also worth validating whether attackers could move laterally undetected in the first place, which is what penetration testing assesses.

Frequently asked questions

What is the difference between NDR and EDR?

EDR monitors endpoints such as laptops and servers through an installed agent. NDR monitors network traffic, including devices that cannot run an agent and the east-west movement between systems. They are complementary parts of the SOC visibility triad.

Is NDR the same as an IDS or IPS?

No. Traditional intrusion detection and prevention rely largely on known signatures. NDR adds behavioural analytics and machine learning to detect novel and stealthy activity, including threats that do not match any signature.

Can NDR inspect encrypted traffic?

Yes. NDR analyses encrypted traffic using behavioural and metadata techniques without decrypting it, so it can flag suspicious patterns while preserving privacy and compliance.

Does NDR replace a firewall or SIEM?

No. A firewall controls traffic at the perimeter and a SIEM correlates logs. NDR adds network behavioural detection that neither provides. The three work together.

How does NDR support Essential Eight and SOCI Act obligations?

Network detection supports the monitoring and incident-response expectations in the Essential Eight and the heightened detection obligations for critical infrastructure under the SOCI Act, and it shortens detection time under the Notifiable Data Breaches scheme.

What does managed NDR cost, and when is it worth it?

Cost depends on network size and coverage. Managed NDR is usually worth it when you lack a 24×7 team to watch alerts, or when internal and lateral-movement visibility is a gap in your current stack. Pricing is scoped to your environment.

See inside your network

CyberPulse delivers NDR as a managed service, deployed and tuned on leading platforms, monitored 24×7 by a local security operations team. To see where NDR adds visibility to your environment, explore our network detection and response service or get in touch.