CREST Practitioner Security Analyst (CPSA) Practice

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Which of the following types of DNS records can be used to provide multiple IP addresses for redundancy?

A/AAAA Records
SOA Records
MX Records
PTR Records

The correct answer is: A/AAAA Records

The correct choice is A, which refers to A and AAAA records. These types of DNS records are specifically designed to map hostnames to IP addresses. An A record maps a hostname to an IPv4 address, while an AAAA record maps a hostname to an IPv6 address. By providing multiple A or AAAA records for a single hostname, it is possible to have multiple IP addresses associated with that hostname. This setup is advantageous for redundancy and load balancing, as DNS will resolve the hostname to one of the available IP addresses, helping to distribute traffic across multiple servers and providing a fallback in case one of the servers is unavailable. The other record types do not fulfill the same purpose. SOA records are used to define the start of a zone and provide essential information about the zone itself, but they do not offer multiple IP addresses. MX records are specifically designed to handle mail exchange routing, determining the mail servers for a domain but not for redundancy of general web traffic. PTR records are used for reverse DNS lookups to map IP addresses back to hostnames, which does not involve providing multiple IP addresses for redundancy.