Chapter 7
1. B. An AAAA resource record is used for mapping the host name to an IPv6 address. An A resource record is used with IPv4 addresses only. A NS resource record lists the DNS servers that are authoritative in the domain. A PTR resource contains IP address-to-name mappings (reverse lookup, the reverse of what is needed in this question).
2. C. A CNAME resource record provides aliases (canonical names), which are additional names that point to the same host. This facilitates the action required in this scenario. You would not use duplicated A address records here. A NS resource record specifies the DNS servers that are authoritative in the domain. An SRV resource record locates servers that provide a defined service on the network. A MX ...
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