GCIA: GIAC Certified Intrusion AnalystDemo

By GIAC · Question Mode

QuestionQ138

Application Protocols

You are a Network Administrator for NetTech Inc. The company operates a Windows Server 2008 domain-based network. The network contains four Windows servers on one of the member servers. Your assistant wants to learn about the caching-only DNS server. Which of the following statements about a caching-only DNS server are correct?

Each correct answer represents a complete solution.

Choose three
  • A It hosts zones and authoritative for a particular domain.
  • B It reduces the amount of DNS traffic on a Wide Area Network (WAN)
  • C It is useful at a site where DNS functionality is needed locally but there is not a requirement for a separate domain for that location.
  • D It performs queries, caches the answers, and returns the results.
Explanation

A caching-only DNS server performs DNS queries, retains the returned resource records in its cache for their applicable TTLs, and returns cached results for later requests. Local caching reduces repeated DNS lookups across a WAN and is useful at a location that requires local DNS functionality but does not need a separate domain. It does not host DNS zones or act as an authoritative server for a domain.

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