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Difficulty: EasyDNS Infrastructure and Record Types

A network technician is configuring DNS resources for a newly deployed web server that must support dual-stack network connectivity. Which TWO of the following DNS record types must be created to resolve the server's hostname directly to its assigned IPv4 and IPv6 addresses?

  1. A recordAnswer
  2. AAAA recordAnswer
  3. C
    CNAME record
  4. D
    PTR record
  5. E
    MX record

Answer

The host name must be mapped to an IPv4 address using an A record and to an IPv6 address using an AAAA record.
To support dual-stack connectivity for a web server, an A record is required to resolve the hostname to an IPv4 address, and an AAAA record is required to resolve the exact same hostname to an IPv6 address.

Step-by-Step Solution

1
Identify the requirement for forward IPv4 resolution.
Determine that mapping a hostname to an IPv4 address requires an A (Address) record.
Standard forward DNS resolution for 32-bit IPv4 addresses relies on A records.
2
Identify the requirement for forward IPv6 resolution.
Determine that mapping a hostname to an IPv6 address requires an AAAA (Quad-A) record.
IPv6 addresses are 128 bits in length (four times the size of an IPv4 address), requiring Quad-A (AAAA) records.

Key Concept

DNS Host Record Mapping for IPv4 and IPv6
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Topics

DNS Infrastructure and Record Types

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