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  SC-22: Architecture and Provisioning for Name/Address Resolution Service  

base control objective:
The information systems that collectively provide name/address resolution service for an organization are fault tolerant and implement internal/external role separation.

supplemental objective information:
A domain name system (DNS) server is an example of an information system that provides name/address resolution service. To eliminate single points of failure and to enhance redundancy, there are typically at least two authoritative domain name system (DNS) servers, one configured as primary and the other as secondary. Additionally, the two servers are commonly located in two different network subnets and geographically separated (i.e., not located in the same physical facility). With regard to role separation, DNS servers with an internal role, only process name/address resolution requests from within the organization (i.e., internal clients). DNS servers with an external role only process name/address resolution information requests from clients external to the organization (i.e., on the external networks including the Internet). The set of clients that can access an authoritative DNS server in a particular role is specified by the organization (e.g., by address ranges, explicit lists).

enhancements to the base objective:

(1) None.

mapping to FIPS199 baseline:

  LOW: null     MOD: base     HIGH: base  

related (regimented) controls:

None.

documents referenced in SP800-53rev3 for SC-22:

Document Date Status Title
NIST SP800-81 August, 2010 current   Secure Domain Name System (DNS) Deployment Guide

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