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Verification of network documentation
Technical cyber security
Network security

Verification of network documentation

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Task description

Verification of network documentation

The organization must maintain up-to-date documentation of all communication protocols used within its network segments, with special focus on those connected to supply-critical systems. This documentation should include:

  • A list of all protocols in use (e.g., TCP, UDP, Modbus, OPC UA, HTTPS, SNMP) within each network segment.
  • The purpose and justification for each protocol, including whether it is essential for operations.
  • Security properties of each protocol (e.g., encryption, authentication, integrity protection).
  • Points of access and boundaries where these protocols communicate with other segments or external parties.

Protocols must be regularly reviewed to ensure only necessary and secure protocols remain in use. Any insecure or outdated protocols should be identified, risk-assessed, and either mitigated or phased out.

Changes to protocol usage must go through the organization’s change management process and be approved by the network owner or security team.

Requirements connected to the task

§ 63: Netværksdokumentation
Bekendtgørelse om modstandsdygtighed og beredskab i energisektoren (Danmark)

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Device identification in remote access (CL III)
Additional security requirements for remote access (CL III)
Critical
High
Normal
Low
Network security
2
requirements

Examples of other requirements this task affects

TEK-18.7: Etäkäyttö - TL III
Julkri
I-18: HANDLING AND TRANSFER OF CLASSIFIED INFORMATION BETWEEN PHYSICALLY PROTECTED AREAS - REMOTE USE AND REMOTE MANAGEMENT
Katakri 2020
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Additional security requirements for remote access (CL III)
Defining standard templates for secure configurations
Critical
High
Normal
Low
Network security
22
requirements

Examples of other requirements this task affects

8.9: Configuration management
ISO 27001
ASSET-3: Manage IT and OT Asset Configuration
C2M2
CC7.1: Procedures for monitoring changes to configurations
SOC 2
1.2.4: Definition of responsibilities with service providers
TISAX
5.3.2: Network device requirements
TISAX
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Defining standard templates for secure configurations
Configuration management and change log
Critical
High
Normal
Low
Network security
17
requirements

Examples of other requirements this task affects

8.9: Configuration management
ISO 27001
CC7.1: Procedures for monitoring changes to configurations
SOC 2
1.2.4: Definition of responsibilities with service providers
TISAX
PR.IP-3: Configuration change control processes are in place.
CyberFundamentals
DE.CM-7: Monitoring for unauthorized personnel, connections, devices, and software is performed.
CyberFundamentals
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Configuration management and change log
Isolate vulnerable and low-trust equipment
Critical
High
Normal
Low
Network security
2
requirements

Examples of other requirements this task affects

2.5.4: Isolate vulnerable and low-trust equipment
NSM ICT-SP
§ 4.11: Sårbarhetshantering och säkerhetstestning
MSBFS 2020:7
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Isolate vulnerable and low-trust equipment
Redundancy solutions for networks
Critical
High
Normal
Low
Network security
5
requirements

Examples of other requirements this task affects

5.3.2: Network device requirements
TISAX
PR.IR-04: Resource capacity
NIST 2.0
§ 3.1.15: Redundans och återställning
MSBFS 2020:7
§ 13: Forretningskontinuitet og planlægning af hændelsesstyring
Energisektor beredskabsbekendtgørelse
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Redundancy solutions for networks
Detailed procedures for the management, control and segmentation of networks
Critical
High
Normal
Low
Network security
19
requirements

Examples of other requirements this task affects

5.2.7: Network management
TISAX
PR.IR-01: Unauthorized access to networks and environments
NIST 2.0
Članak 30.1.e: Sigurnost u nabavi, razvoju i održavanju mrežnih i informacijskih sustava
NIS2 Croatia
14.5.10.b): Prieigos kontrolė
NIS2 Lithuania
3.1.8: Säkrade lösningar för kommunikation
NIS2 Sweden
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Detailed procedures for the management, control and segmentation of networks
System hardening through minimization of active services
Critical
High
Normal
Low
Network security
2
requirements

Examples of other requirements this task affects

TEK-10.1: Järjestelmäkovennus - käytössä olevien palveluiden minimointi
Julkri
I-08: PRINCIPLE OF MINIMALITY AND OF LEAST PRIVILEGE - SYSTEMS HARDENING
Katakri 2020
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System hardening through minimization of active services
Monitoring configurations
Critical
High
Normal
Low
Network security
12
requirements

Examples of other requirements this task affects

8.9: Configuration management
ISO 27001
1.2.4: Definition of responsibilities with service providers
TISAX
DE.CM-7: Monitoring for unauthorized personnel, connections, devices, and software is performed.
CyberFundamentals
2.3.4: Establish and maintain standard security configurations
NSM ICT-SP
2.3.5: Verify that activated security configurations comply with the organisation’s approved security configurations
NSM ICT-SP
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Monitoring configurations

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