70-410 Windows Server 2012: Dns Record Types

Front 1

start of authority (SOA)

Back 1

The first record in a database file is the ___________ record. The __________ defines the general parameters for the DNS zone, including the identity of the authoritative server for the zone.

Front 2

Current zone

Back 2

SOA record structure: The current zone for the SOA. This can be represented by an @ symbol to indicate the current zone or by naming the zone itself. In the example, the current zone is example.com. The trailing dot (.com.) indicates the zone’s place relative to the root of the DNS.

Front 3

Class

Back 3

SOA record structure: This will almost always be the letters IN for the Internet class.

Front 4

Type of record

Back 4

SOA record structure: The type of record follows. In this case, it’s SOA.

Front 5

Primary master

Back 5

SOA record structure: The primary master for the zone on which this file is maintained.

Front 6

Contact email

Back 6

SOA record structure: The Internet email address for the person responsible for this domain’s database file. There is no @ symbol in this contact email address because @ is a special character in zone files. The contact email address is separated by a single dot (.). So the email address of [e-mail] would be represented by root.example.com in a zone file.

Front 7

Serial number

Back 7

SOA record structure: This is the “version number” of this database file. It increases each time the database file is changed.

Front 8

Refresh time

Back 8

SOA record structure: The amount of time (in seconds) that a secondary server will wait between checks to its master server to see if the database file has changed and a zone transfer should be requested.

Front 9

Retry time

Back 9

SOA record structure: The amount of time (in seconds) that a secondary server will wait before retrying a failed zone transfer.

Front 10

Expiration time

Back 10

SOA record structure: The amount of time (in seconds) that a secondary server will spend trying to download a zone. Once this time limit expires, the old zone information will be discarded.

Front 11

Time to live

Back 11

SOA record structure: The amount of time (in seconds) that another DNS server is allowed to cache any resource records from this database file. This is the value that is sent out with all query responses from this zone file when the individual resource record doesn’t contain an overriding value.

Front 12

Name server (NS)

Back 12

__________ records list the name servers for a domain. This record allows other name servers to look up names in your domain.

Front 13

Name

Back 13

NS record structure: The domain that will be serviced by this name server.

Front 14

AddressClass

Back 14

NS record structure: Internet (IN)

Front 15

RecordType

Back 15

NS record structure:Name server (NS)

Front 16

Name Server Name

Back 16

NS record structure: The FQDN of the server responsible for the domain

Front 17

host record

Back 17

A __________ (also called an A record for IPv4 and AAAA record for IPv6) is used to associate statically a host’s name to its IP addresses.

Front 18

alias

Back 18

Closely related to the host record is the ____ record, or canonical name (CNAME) record. ______ records are used to point more than one DNS record toward a host for which an A record already exists.

Front 19

Pointer (PTR)

Back 19

The A or AAAA record maps a hostname to an IP address, and the _____ record does just the opposite—mapping an IP address to a hostname through the use of the in-addr.arpa zone. The _____ record is necessary because IP addresses begin with the least-specific portion first (the network) and end with the most-specific portion (the host), whereas hostnames begin with the most-specific portion at the beginning and the least-specific portion at the end.

Front 20

mail exchanger (MX)

Back 20

The _____________ record is used to specify which servers accept mail for this domain. Each _________ record contains two parameters—a preference and a mail server

Front 21

Service (SRV)

Back 21

____________ records tie together the location of a service (like a domain controller) with information about how to contact the service.

Front 22

Domain name

Back 22

SRV record structure:Domain for which this record is valid

Front 23

TTL

Back 23

SRV record structure: Time to live (86,400 seconds).

Front 24

Class

Back 24

SRV record structure: This field is always IN, which stands for Internet.

Front 25

Record type

Back 25

SRV record structure: Type of record (SRV).

Front 26

Priority

Back 26

SRV record structure: Specifies a preference, similar to the Preference field in an MX record. The SRV record with the lowest priority is used first (10).

Front 27

Weight

Back 27

SRV record structure: Service records with equal priority are chosen according to their weight (100).

Front 28

Port number

Back 28

SRV record structure: The port where the server is listening for this service (389).

Front 29

Target

Back 29

SRV record structure: The FQDN of the host computer