Network Security Assessment: A Complete Guide to Testing Your Network Defences

Your network is the highway connecting every system in your organisation. Web servers, databases, Active Directory, cloud infrastructure, employee workstations, IoT devices, and critical business applications all communicate across your network. If an attacker can move freely through that highway, compromising one system means compromising everything.

A network security assessment evaluates whether your network infrastructure prevents unauthorised access, detects malicious activity, contains breaches to limited segments, and protects the data flowing between systems. It tests firewalls, routers, switches, wireless access points, VPN gateways, network segmentation, access controls, and every other component determining whether your network is a barrier to attackers or a pathway through your entire environment.

Most organisations know their network exists. Few know what their network actually looks like from an attacker's perspective. Shadow IT adding unapproved devices. Legacy systems running unpatched services. Flat network architectures allowing unrestricted lateral movement. Firewall rules accumulated over years that nobody has reviewed. VPN configurations granting broader access than intended. Each gap represents a pathway an attacker can exploit.

Network security assessment reveals these gaps before attackers find them. It combines vulnerability assessment (identifying network weaknesses systematically) with network penetration testing (proving which weaknesses are genuinely exploitable and what damage results).

This guide covers what network security assessment includes, internal and external assessment components, the assessment methodology, common findings US organisations encounter, a practical checklist, compliance requirements, and how to choose a provider that delivers genuine network security assurance.

What Is a Network Security Assessment?

A network security assessment is a comprehensive evaluation of an organisation's network infrastructure, architecture, configurations, and security controls to identify vulnerabilities, misconfigurations, and design weaknesses that could enable unauthorised access, data exfiltration, or business disruption.

Network security assessment goes beyond running a vulnerability scanner against your IP ranges. It evaluates how your network is designed (architecture and segmentation), how it's configured (firewall rules, access controls, protocols), how it's maintained (patching, monitoring, change management), and how it performs under adversarial conditions (penetration testing).

What Network Security Assessment Covers

Network architecture and design. How your network is structured, including segmentation between critical and user networks, DMZ design, VLAN configuration, and trust boundaries between network zones.

‍Perimeter security. Firewalls, intrusion detection/prevention systems (IDS/IPS), proxy servers, and other perimeter controls protecting your network from external threats.

Internal network security. Segmentation between internal zones, lateral movement controls, switch security, routing configuration, and internal access restrictions.

Wireless network security. WiFi configuration, encryption, authentication, rogue access point detection, and segmentation between wireless and wired networks.

Remote access security. VPN configuration, remote desktop services, zero trust network access (ZTNA), and other mechanisms enabling remote connectivity.

Network services and protocols. DNS, DHCP, NTP, SNMP, and other network services evaluated for secure configuration and unnecessary exposure.

Network monitoring and detection. SIEM integration, NetFlow/sFlow collection, IDS/IPS effectiveness, and logging coverage across network infrastructure.

Understanding attack surface management helps organisations appreciate how network assessment maps the infrastructure attackers target.

External Network Security Assessment

External network security assessment evaluates your network from the outside, testing what an internet-based attacker can see, reach, and exploit across your public-facing infrastructure.

What External Assessment Tests

Perimeter scanning. All public IP ranges scanned for open ports, exposed services, and running software. Every internet-accessible port represents potential attack surface. Common findings include unnecessary services exposed to the internet, administrative ports (RDP 3389, SSH 22, database ports) accessible from any IP, and legacy services with known vulnerabilities running on public-facing systems.

Firewall rule validation. Testing whether firewall rules effectively restrict access. Years of accumulated rules frequently contain overly permissive entries, forgotten temporary exceptions, and rules that no longer match current requirements.

VPN and remote access testing. VPN gateways tested for authentication weaknesses (weak credentials, missing MFA, known vulnerabilities), configuration issues, and split-tunnelling risks. Remote access points are primary attack targets because successful exploitation provides direct internal network access.

IDS/IPS effectiveness. Testing whether intrusion detection and prevention systems detect and block common attack patterns, evasion techniques, and malicious traffic.

SSL/TLS configuration. Certificate validity, protocol versions (TLS 1.2 minimum, TLS 1.3 preferred), cipher suite strength, and configuration weaknesses across all internet-facing services.

DNS security. Zone transfer restrictions, DNSSEC implementation, DNS poisoning susceptibility, and subdomain enumeration revealing hidden services.

Email infrastructure. SPF, DKIM, and DMARC configuration preventing email spoofing. Mail server security including relay testing and known vulnerabilities.

For comprehensive external testing methodology, see our external penetration testing guide.

Common External Assessment Findings

Exposed management ports. RDP (3389) and SSH (22) accessible from the internet without IP source restrictions. These ports are actively scanned by automated attack tools within minutes of exposure.

Outdated SSL/TLS. TLS 1.0 and 1.1 still enabled on internet-facing services despite known vulnerabilities. Weak cipher suites enabling potential man-in-the-middle attacks.

Missing email authentication. Absent or misconfigured SPF, DKIM, or DMARC enabling attackers to spoof organisational email for phishing campaigns.

Unnecessary services. Development, testing, or administrative services unintentionally exposed to the internet. Services that were "temporarily" enabled months or years ago and never removed.

Internal Network Security Assessment

Internal network security assessment evaluates your network from the inside, testing what an attacker with internal access (through compromised credentials, phishing, insider threat, or vendor access) can achieve.

What Internal Assessment Tests

Network segmentation. The most critical internal network security control. Testing validates whether critical systems (domain controllers, databases, backup servers, management interfaces) are isolated from standard user networks. Flat networks without segmentation allow an attacker compromising a single workstation to reach every system in the environment.

Segmentation testing involves attempting to communicate between network zones that should be isolated: workstation VLANs to server VLANs, user networks to management networks, guest WiFi to corporate networks, and production to development environments.

Active Directory security. AD controls authentication and authorisation for every domain-joined system. Internal penetration testing of Active Directory evaluates Kerberoasting exposure, delegation configurations, ACL permissions, Group Policy security, trust relationships, and credential hygiene. AD compromise typically means complete network compromise.

Lateral movement paths. Testing how an attacker moves between systems using captured credentials, protocol exploitation (SMB, WMI, WinRM, RDP), and trust relationships. Each compromised system provides new credentials and new attack opportunities.

Switch and router security. Network device configurations evaluated for default credentials, unnecessary management protocols (Telnet, unencrypted SNMP), VLAN hopping vulnerabilities, ARP spoofing susceptibility, and inadequate access control lists.

DHCP and DNS security. DHCP starvation attacks, rogue DHCP server detection, DNS poisoning on internal networks, and DNS query logging for security monitoring.

Legacy protocol exposure. LLMNR, NBT-NS, WPAD, and other legacy protocols enabling credential capture through poisoning attacks. These protocols are enabled by default on Windows networks and provide reliable credential harvesting for attackers.

Network device management. iLO, iDRAC, IPMI, and other out-of-band management interfaces tested for access controls, default credentials, and known vulnerabilities. Management interfaces frequently reside on the same network as user systems without adequate access restriction.

For detailed internal testing methodology, see our internal penetration testing guide.

Common Internal Assessment Findings

Flat network architecture. No effective segmentation between workstations, servers, databases, and management interfaces. An attacker compromising any system can reach every other system without encountering network-level barriers.

Legacy protocol credential harvesting. LLMNR and NBT-NS enabled on Windows networks allowing credential capture through network poisoning. Responder-style attacks capture NTLMv2 hashes from standard network traffic within minutes on most corporate networks.

Unrestricted management access. Server management interfaces (iLO, iDRAC, vCenter) accessible from user workstation VLANs. Network device consoles reachable from standard user networks.

VLAN misconfigurations. VLANs configured but inter-VLAN routing allowing unrestricted traffic between zones that should be isolated. Segmentation exists on paper but not in practice.

Wireless Network Security Assessment

Wireless assessment evaluates WiFi networks for security weaknesses enabling unauthorised access, traffic interception, or network bridging.

What Wireless Assessment Tests

Encryption and authentication. WPA3 or WPA2-Enterprise implementation validated. WPA2-Personal (PSK) evaluated for password strength. Legacy WEP or WPA identified for immediate remediation.

Rogue access point detection. Scanning for unauthorised wireless access points connected to the corporate network. Rogue APs bypass wired network security controls, providing attackers direct network access.

Guest network isolation. Validating that guest WiFi is properly segmented from corporate networks, preventing guest users from accessing internal resources.

Evil twin susceptibility. Testing whether corporate devices connect to attacker-controlled access points mimicking legitimate corporate WiFi.

Wireless client security. Evaluating whether corporate devices probe for previously connected networks, potentially connecting to malicious networks.

Network Security Assessment Methodology

Phase 1: Discovery and Scoping

Asset discovery. Map the complete network inventory including routers, switches, firewalls, wireless access points, servers, workstations, IoT devices, and cloud connectivity. Network discovery frequently reveals devices and segments organisations don't know exist.

Architecture review. Analyse network diagrams, VLAN configurations, firewall rule sets, routing tables, and segmentation design. Understanding intended architecture enables testing whether implementation matches design.

Scope definition. Establish which network segments, IP ranges, and components are in scope. Align scope with compliance requirements driving the assessment.

Phase 2: Vulnerability Assessment

Automated scanning. Network vulnerability scanners identify known CVEs across network devices, servers, and services. Scanning covers operating systems, network services, firmware versions, and configuration weaknesses.

Configuration audit. Network device configurations compared against CIS Benchmarks, NIST guidelines, and vendor security best practices. Firewall rules, ACLs, routing configurations, and security settings are evaluated for misconfigurations.

Manual validation. Security professionals review automated findings, eliminate false positives, and identify configuration issues scanners miss. Manual testing adds the contextual analysis that automated tools lack.

Understanding the broader VAPT process shows how network vulnerability assessment integrates with penetration testing for comprehensive validation.

Phase 3: Penetration Testing

External exploitation. Testers attempt to breach the network perimeter from outside, exploiting identified vulnerabilities in internet-facing systems, VPN gateways, and exposed services.

Internal exploitation. From an assumed internal position, testers attempt lateral movement, privilege escalation, and access to critical systems. This phase demonstrates what an attacker achieves after initial access.

Segmentation bypass. Testers specifically attempt to move between network segments that should be isolated, validating whether segmentation controls function under adversarial conditions.

Credential attacks. Password spraying, credential stuffing, hash cracking, and credential capture through protocol poisoning test whether authentication controls prevent credential-based compromise.

For the complete testing methodology, see our penetration testing methodology guide.

Phase 4: Analysis and Reporting

Risk prioritisation. Findings prioritised by combined technical severity and business impact. A medium-severity segmentation gap enabling access to payment systems may warrant higher priority than a high-severity vulnerability on an isolated test server.

Attack path documentation. Individual findings chained into complete attack narratives demonstrating how network weaknesses combine to enable significant compromise. Attack paths communicate risk more effectively than individual vulnerability lists.

Compliance mapping. Findings mapped to applicable frameworks (PCI DSS, SOC 2, ISO 27001, HIPAA, NIST CSF).

Remediation guidance. Specific, actionable fix recommendations for each finding. Configuration changes, architecture improvements, and compensating controls documented with implementation steps.

For report quality standards, see our penetration testing reports guide.

Phase 5: Remediation Support and Retesting

Remediation guidance. Supporting your network and infrastructure teams implementing fixes. Answering questions about findings, reviewing proposed configuration changes, and validating that remediation approaches address root causes.

Retesting. Validating that all remediated findings are genuinely resolved and that fixes haven't introduced new network weaknesses. Retesting confirms that your remediation investment produced actual security improvement.

Network Security Assessment Checklist

Perimeter Security

• All public IP ranges scanned for open ports

• No administrative ports (RDP, SSH, database) exposed to internet without source restriction

• Firewall rules reviewed and unnecessary rules removed

• Firewall rule base doesn't contain "any-any" rules for production traffic

• IDS/IPS operational with current signatures and appropriate thresholds

• SSL/TLS using TLS 1.2+ with strong cipher suites

• Certificates valid and properly configured

• DDoS protection deployed for public-facing services

Internal Segmentation

• Critical systems (DCs, databases, backups) isolated from user networks

• Management networks separated from production and user segments

• Inter-VLAN routing restricted by explicit firewall rules

• PCI cardholder data environment segmented from corporate network

• Development/staging environments isolated from production

• Guest networks fully isolated from corporate networks

• East-west traffic monitoring between segments enabled

Active Directory and Identity

• No service accounts with weak passwords and elevated privileges

• LAPS deployed for unique local admin passwords

• Tiered administration model separating Tier 0/1/2 access

• Legacy protocols (LLMNR, NBT-NS) disabled or monitored

• Domain admin accounts not used for daily operations

• MFA enforced for all privileged and remote access

Network Device Security

• Default credentials changed on all network devices

• Telnet disabled; SSH required for management access

• SNMP v3 with authentication; v1/v2c disabled

• Management interfaces on dedicated management VLAN

• Firmware updated to current stable versions

• Unused ports disabled on switches

• Port security or 802.1X deployed

Wireless Security

• WPA3 or WPA2-Enterprise with RADIUS authentication

• Guest WiFi fully isolated from corporate network

• Rogue AP detection operational

• Wireless management interfaces not accessible from client VLANs

• SSID broadcasting appropriate (hidden for internal, visible for guest)

VPN and Remote Access

• VPN requiring MFA for all connections

• Split tunnelling disabled or properly configured

• VPN software updated to current versions

• VPN access logging and monitoring enabled

• Remote access limited to required resources (not full network access)

Monitoring and Detection

• Network traffic logging enabled (NetFlow/sFlow)

• SIEM collecting logs from all network devices

• Alerting configured for unusual traffic patterns

• DNS query logging enabled

• IDS/IPS alerts reviewed and tuned regularly

• Network baseline established for anomaly detection

Common Network Security Assessment Findings in US Organisations

Finding 1: Flat Internal Networks

Severity: High Prevalence: Found in majority of mid-market US organisations

The single most impactful finding in network security assessments. Networks without effective segmentation allow a compromised workstation to communicate directly with domain controllers, database servers, backup systems, and management interfaces. Every system is reachable from every other system.

Flat networks transform every individual system vulnerability into a potential complete network compromise because there are no barriers slowing lateral movement after initial access.

Finding 2: Accumulated Firewall Rule Bloat

Severity: Medium to High Prevalence: Nearly universal in organisations with firewalls older than three years

Firewall rule bases grow continuously as new rules are added for applications, vendors, and temporary access. Rules are rarely removed when the need expires. Over years, rule bases accumulate hundreds of entries including rules nobody remembers creating, overly broad rules added "temporarily," conflicting rules where order determines which applies, and rules granting access to decommissioned systems.

Rule bloat creates unintended access paths and makes firewall management increasingly difficult.

Finding 3: Missing Network Monitoring

Severity: High Prevalence: Common even in security-conscious organisations

Network infrastructure generates logs that nobody collects, analyses, or alerts on. Firewall logs not forwarded to SIEM. Switch logs not collected. DNS queries not monitored. NetFlow data not analysed. Without network monitoring, lateral movement, data exfiltration, and command-and-control communication go undetected.

Finding 4: Legacy Protocol Exposure

Severity: Medium to High Prevalence: Default on most Windows networks

LLMNR, NBT-NS, and WPAD protocols enabled by default on Windows networks. These protocols respond to broadcast queries with authentication challenges, allowing attackers to capture credential hashes passively. On most US corporate networks, a tester running Responder captures valid credential hashes within the first hour of internal assessment.

Finding 5: VPN Overprovisioning

Severity: Medium Prevalence: Common since COVID-era remote access expansion

VPN configurations granting full network access when users need only specific applications. Remote users connecting through VPN have the same network reach as if they were sitting in the office, including access to servers, databases, and management interfaces their job role doesn't require.

Finding 6: Unmanaged Network Devices

Severity: Medium to High Prevalence: Growing with IoT and shadow IT

Devices on the network that nobody manages or monitors: IoT sensors, smart displays, personal devices, and legacy equipment. These devices lack patching, endpoint protection, and security monitoring, providing footholds on network segments they shouldn't access.

US Compliance Requirements for Network Security Assessment

PCI DSS

PCI DSS contains the most specific network security assessment requirements.

Requirement 1: Install and maintain network security controls (firewalls, segmentation). Network assessment validates firewall configuration and segmentation between cardholder data environment (CDE) and other networks.

Requirement 11.3: Annual penetration testing including internal and external network testing. Segmentation testing required if network segmentation is used to limit PCI DSS scope.

Requirement 11.2: Quarterly external vulnerability scanning by Approved Scanning Vendor (ASV).

Network security assessment directly supports PCI DSS compliance by validating firewall rules, segmentation effectiveness, and network-level access controls. See our PCI DSS penetration testing guide.

SOC 2

SOC 2 Common Criteria CC6 (Logical and Physical Access Controls) requires evidence that network access controls prevent unauthorised access. Network security assessment validates that firewalls, segmentation, and access controls function under adversarial conditions.

CC7 (System Operations) requires monitoring and detection capabilities. Network assessment evaluates whether monitoring covers network infrastructure adequately. See how SOC 2 pentests support compliance.

HIPAA

HIPAA Security Rule requires technical safeguards protecting ePHI including access controls, audit controls, and transmission security. Network assessment validates that network segmentation isolates systems processing health data, network access controls prevent unauthorised access, and encrypted transmission protects ePHI crossing network boundaries.

NIST Cybersecurity Framework

NIST CSF functions directly addressed by network security assessment.

Identify (ID): Asset inventory and network mapping supporting ID.AM (Asset Management).

Protect (PR): Firewall, segmentation, and access control validation supporting PR.AC (Identity Management and Access Control) and PR.PT (Protective Technology).

Detect (DE): Monitoring and IDS/IPS effectiveness supporting DE.CM (Continuous Monitoring) and DE.AE (Anomalies and Events).

NYDFS 23 NYCRR 500

New York's financial cybersecurity regulation requires annual penetration testing including network assessment for covered financial institutions. Network security assessment validates cybersecurity programme controls mandated under Section 500.05.

CMMC (Cybersecurity Maturity Model Certification)

Department of Defense contractors require CMMC certification with network security controls at every maturity level. Network security assessment validates access control, audit and accountability, configuration management, and system and communications protection practices required for CMMC Levels 1 through 3.

For comprehensive compliance alignment, see our penetration testing compliance guide.

When to Conduct Network Security Assessment

Annually at minimum for compliance with PCI DSS, SOC 2, HIPAA, NYDFS, and CMMC requirements.

After network architecture changes including segmentation redesigns, new VLAN implementations, firewall migrations, and data centre consolidations.

After cloud migration connecting cloud environments to corporate networks through VPN, Direct Connect, or ExpressRoute. Cloud connectivity changes network topology and attack surface.

After mergers and acquisitions integrating acquired company networks into existing infrastructure. Network integration creates new trust boundaries and potential lateral movement paths.

After deploying new network security controls (next-gen firewalls, micro-segmentation, ZTNA) to validate that new controls function as intended.

After security incidents involving network compromise to validate that remediation addresses the attack vector and that similar paths don't exist elsewhere.

When onboarding vendors with network access to validate that vendor network segments are properly isolated from critical infrastructure.

For frequency guidance, see our detailed guide on how often to do penetration testing.

How to Choose a Network Security Assessment Provider

Network-Specific Expertise

Network assessment requires different skills than web application testing. Verify the provider has expertise in firewall rule analysis, network architecture review, Active Directory assessment, segmentation testing, and protocol-level exploitation. Providers specialising only in web application testing may lack the infrastructure expertise network assessment demands.

Internal and External Coverage

Comprehensive network security assessment requires both external perimeter testing and internal network assessment. Verify the provider covers both rather than offering only external scanning.

Manual Testing Beyond Scanning

Automated network vulnerability scanners identify known CVEs efficiently. Manual penetration testing validates whether those CVEs are exploitable, tests segmentation by actually attempting lateral movement, and identifies configuration weaknesses scanners miss. Ensure the provider conducts genuine manual testing, not just automated scanning with a pentest label.

Compliance Mapping

Verify the provider maps findings to your applicable compliance frameworks (PCI DSS, SOC 2, HIPAA, NIST CSF, CMMC). Network assessment reports without compliance mapping create additional work for audit preparation.

Retesting Inclusion

Network remediation (firewall rule changes, segmentation implementation, device hardening) requires validation that changes produce intended results without breaking legitimate traffic. Confirm retesting is included.

Learn how to evaluate penetration testing quality before selecting a provider.

How AppSecure Delivers Network Security Assessment

AppSecure provides comprehensive network security assessment covering both external perimeter and internal infrastructure through expert-led manual testing.

Complete Network Coverage

Network security assessment covers external perimeter testing, internal network penetration testing, Active Directory assessment, wireless security evaluation, segmentation validation, and VPN/remote access testing. Network penetration testing validates that your network infrastructure resists real-world attack techniques.

Expert Manual Testing

Certified professionals (OSCP, GXPN, CREST) conduct hands-on network testing beyond automated scanning. Testers validate segmentation by attempting lateral movement, test Active Directory attack paths, exploit protocol weaknesses, and demonstrate complete attack chains from initial access to critical system compromise. Zero false positives ensure every finding is genuine.

Architecture-Aware Assessment

AppSecure evaluates your network architecture holistically, not just individual devices. Assessment considers how segmentation design, trust boundaries, routing, and access controls work together as a system. Findings address architectural weaknesses alongside point vulnerabilities.

US Compliance Mapping

Reports map findings to PCI DSS, SOC 2, HIPAA, NIST CSF, NYDFS, and CMMC requirements. Compliance mapping enables straightforward audit reporting for US regulatory requirements.

3-Week Delivery

Standard network security assessment engagements deliver within three weeks. 90-day post-delivery support includes remediation guidance for network hardening, segmentation improvements, and device configuration changes, plus complimentary retesting validating fixes.

Comprehensive Security Services

Network assessment integrates with web application testing, API testing, cloud testing, and mobile testing for full-stack security coverage. Application security assessment and offensive security testing provide end-to-end validation. Red teaming tests network defences against realistic adversary campaigns. Continuous penetration testing and pentesting as a service maintain ongoing network security validation.

Ready for a network security assessment that reveals what your infrastructure actually looks like to attackers?

Contact AppSecure:

• Schedule Network Security Assessment
• Application Security Assessment

Frequently Asked Questions

1. What is a network security assessment?

A network security assessment is a comprehensive evaluation of an organisation's network infrastructure, architecture, configurations, and security controls to identify vulnerabilities, misconfigurations, and design weaknesses. Assessment covers external perimeter security (firewalls, IDS/IPS, VPN), internal network security (segmentation, Active Directory, lateral movement), wireless security, remote access, network services, and monitoring capabilities. Network security assessment combines automated vulnerability scanning with manual penetration testing to validate that network controls genuinely prevent unauthorised access under adversarial conditions.

2. What is the difference between network security assessment and vulnerability scanning?

Network vulnerability scanning runs automated tools checking network devices and services against known vulnerability databases. Scanning identifies potential weaknesses but doesn't validate exploitability, test segmentation effectiveness, or demonstrate lateral movement. Network security assessment includes scanning as one component but adds architecture review, segmentation testing through actual lateral movement attempts, Active Directory assessment, firewall rule analysis, protocol-level testing, and manual exploitation proving which weaknesses enable real network compromise. Scanning finds potential issues. Assessment proves which issues actually matter.

3. What are the most common network security assessment findings?

The most common findings include flat networks without effective segmentation (enabling unrestricted lateral movement), accumulated firewall rule bloat creating unintended access paths, legacy protocols (LLMNR, NBT-NS) enabling credential capture, VPN configurations granting excessive network access, missing network monitoring and logging, unmanaged devices on corporate networks, default credentials on network devices and management interfaces, and outdated firmware on network infrastructure. Flat network architecture is consistently the highest-impact finding because it transforms any single system compromise into potential complete network compromise.

4. How often should network security assessments be conducted?

Network security assessments should be conducted annually at minimum for compliance with PCI DSS, SOC 2, HIPAA, NYDFS, and CMMC. Additional assessments should follow network architecture changes, cloud migration, mergers and acquisitions, new security control deployment, security incidents, and vendor onboarding with network access. Organisations with complex networks or high-value data benefit from semi-annual assessments alternating focus between external perimeter and internal network.

5. What compliance frameworks require network security assessment?

PCI DSS mandates annual penetration testing including network assessment and quarterly external vulnerability scanning. SOC 2 requires evidence of network access control effectiveness. HIPAA requires network security safeguards for healthcare environments. NIST CSF addresses network security across Identify, Protect, and Detect functions. NYDFS 23 NYCRR 500 requires annual penetration testing including network assessment. CMMC requires network security controls for DoD contractors. Most frameworks requiring security testing expect network infrastructure assessment as a core component.

6. Does network security assessment include wireless testing?

Comprehensive network security assessments should include wireless security evaluation covering WiFi encryption and authentication configuration, rogue access point detection, guest network isolation from corporate networks, evil twin susceptibility, and wireless client security. Wireless networks connected to corporate infrastructure represent network attack surface requiring the same assessment rigour as wired networks. If the provider's proposal doesn't mention wireless testing, ask specifically whether it's included.

7. What is the difference between internal and external network security assessment?

External network security assessment evaluates the network perimeter from the internet: firewalls, exposed services, VPN gateways, IDS/IPS, and public-facing infrastructure. External assessment tests whether an internet-based attacker can breach the perimeter. Internal network security assessment evaluates the network from inside: segmentation, Active Directory, lateral movement, internal services, and credential security. Internal assessment tests what an attacker achieves after gaining internal access. Comprehensive assessment includes both because external defences eventually fail and internal controls must contain the breach.

8. How long does a network security assessment take?

Standard network security assessment covering both external and internal components typically takes two to three weeks. External perimeter assessment takes three to five days. Internal network assessment including Active Directory and segmentation testing takes five to seven days. Analysis, reporting, and delivery take three to five days. Large enterprise networks with multiple segments, extensive cloud connectivity, and complex Active Directory environments may require additional time. AppSecure delivers standard network assessments within three weeks.

9. What should organisations prepare for network security assessment?

Prepare network topology diagrams and VLAN documentation, IP ranges for both external and internal scope, firewall rule exports for review, a standard domain-joined workstation for internal testing (or VPN access), domain user credentials for authenticated internal assessment, internal contacts available during testing (network team, SOC), testing windows and any maintenance schedules, compliance requirements the report must address, and previous assessment reports for year-over-year comparison. Do not temporarily harden the network before testing.

10. Can network security assessment be conducted continuously?

Yes. Traditional network assessment occurs as periodic point-in-time engagements. Continuous network security monitoring through automated vulnerability scanning, network traffic analysis, and configuration compliance monitoring provides ongoing visibility between assessments. Continuous penetration testing through PTaaS models enables on-demand network testing when changes occur. The optimal approach combines continuous automated monitoring with annual or semi-annual manual assessment for both breadth and depth.