8.6. Case Study: DNS Service

To further illustrate the approach, we model and analyze the trustworthiness (i.e., the security and dependability behavior) of a DNS service. The Domain Name System (DNS) provides a critical service to the Internet—the mapping between names and addresses. The original DNS specifications require that each domain name is served by (at least) two servers, usually referred to as the “primary” and “secondary” server. The primary DNS server holds the “master copy” of the data for a zone. When changes are made to zone data on the primary server, they must be distributed to the secondary server. The secondary server also periodically checks for changes. Contaminated data from the primary can, therefore, be transferred to ...

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