How to Set Up Alias DNS Entry for Email Server - CompTIA Network+ Exam N10-007

An email server, which is called Frederick, has an IPv6 address of 2001::5689:23:ABCD:6A, but most users call it Fred for short.

Which of the following DNS entries is needed so the alias Fred can also be used?

A.

MX

B.

AAAA

C.

SRV

D.

CNAME

E.

TXT

F.

NS.

D.

The DNS entry that is needed to create an alias for the email server with IPv6 address 2001::5689:23:ABCD:6A, called Frederick, is a CNAME record.

A CNAME (Canonical Name) record is a DNS record used to create an alias or nickname for a hostname. In this case, the hostname is Frederick, and the alias is Fred.

To create the alias, a CNAME record would need to be added to the DNS zone file. The record would look something like this:

objectivecCopy code
fred     IN     CNAME     frederick.example.com. 

This tells the DNS resolver that whenever a user types in "fred.example.com", they should be directed to "frederick.example.com".

Option A, an MX (Mail eXchanger) record, is used to specify the mail server responsible for handling email messages sent to a specific domain name. This is not relevant to creating an alias for the email server.

Option B, an AAAA record, is used to map a hostname to an IPv6 address. In this case, the IPv6 address for the email server has already been specified, so this option is not relevant.

Option C, an SRV (Service) record, is used to specify the location of services such as domain controllers, email servers, or other servers offering specific services. While this option is related to email servers, it is not relevant to creating an alias.

Option E, a TXT (Text) record, is used to store arbitrary text data in DNS. This option is not relevant to creating an alias for the email server.

Option F, an NS (Name Server) record, is used to specify the authoritative DNS server for a particular domain. This option is not relevant to creating an alias for the email server.