15.4.9 Check Your Understanding – IP Addressing Services Answers

1. Which of the following DNS record types is used to resolve IPv6 addresses?

  • A
  • NS
  • AAAA
  • MX

Explanation: DNS AAAA records are used to resolve names to IPv6 addresses.

2. True or false? A DNS server that receives a request for a name resolution that is not within its DNS zone will send a failure message to the requesting client.

  • True
  • False

Explanation: The correct answer is False. When a DNS server receives a name resolution request for a name not within its zone, the serve will forward the request to another DNS server.

3. Which of the following is displayed by the nslookup utility?

  • the configured default DNS server
  • the IP address of the end device
  • all cached DNS entries

Explanation: By issuing the nslookup command, the default DNS server that is configured is displayed.

4. Which of the following DNS resource record types resolves authoritative name servers?

  • NS
  • A
  • MX
  • AAAA

Explanation: NS records resolve authoritative name servers. DNS A records resolve IPv4 addresses. AAAA records resolve IPv6 addresses, and MX records resolve mail exchange servers.

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