03.13.10E Separate Subnetworks

Statement

Implement separate network addresses to connect to systems in different security domains.

Guidance

The decomposition of systems into subnetworks (i.e., subnets) helps to provide the appropriate level of protection for network connections to different security domains. This requirement enhances SP 800-171 requirement 03.13.01.

Statement

• (includes preempt) Ensure that the threat event does not have an impact.

  • Reduce likelihood of occurrence and/or reduce likelihood of impact.

  • The adversary’s efforts or resources cannot be applied or are wasted.

• (includes exert) Make it more difficult for threat events to cause adverse impacts or consequences.

  • Reduce likelihood of impact and reduce level of impact.

  • Adversary activities are restricted in scope, fail to achieve full effect, do not take place in accordance with adversary timeline, or require greater resources than adversary had planned.

• (includes reduce) Restrict the consequences of realized threat events by limiting the damage or effects they cause in terms of time, system resources, and/or mission or business impacts.

  • Reduce level of impact and reduce likelihood of impact of subsequent events in the same threat scenario.

  • The adversary’s effectiveness is restricted.

Assessment objective

separate network addresses are implemented to connect to systems in different security domains.

Assessment method

• System and communications protection policy procedures addressing boundary protection system design documentation system hardware and software system architecture system configuration settings and associated documentation system audit records system security plan other relevant documents or records

Assessment method

• System/network administrators personnel with information security responsibilities system developers personnel with boundary protection responsibilities

Assessment method

• Mechanisms supporting and/or implementing separate network addresses or different subnets

1. Преглед

1.1 Препратки

1.2 Идентифицирани изисквания

1.3 Свързани регулации

2. Идентифицирани изисквания

3. Свързани регулации

Свързани задачи

• NIST -

  https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final