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29 Cards in this Set
- Front
- Back
start of authority (SOA) |
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. |
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Current zone |
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. |
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Class |
SOA record structure: This will almost always be the letters IN for the Internet class. |
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Type of record |
SOA record structure: The type of record follows. In this case, it’s SOA. |
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Primary master |
SOA record structure: The primary master for the zone on which this file is maintained. |
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Contact email |
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 root@example.com would be represented by root.example.com in a zone file. |
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Serial number |
SOA record structure: This is the “version number” of this database file. It increases each time the database file is changed. |
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Refresh time |
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. |
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Retry time |
SOA record structure: The amount of time (in seconds) that a secondary server will wait before retrying a failed zone transfer. |
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Expiration time |
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. |
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Time to live |
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. |
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Name server (NS) |
__________ records list the name servers for a domain. This record allows other name servers to look up names in your domain. |
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Name |
NS record structure: The domain that will be serviced by this name server. |
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AddressClass |
NS record structure: Internet (IN) |
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RecordType |
NS record structure:Name server (NS) |
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Name Server Name |
NS record structure: The FQDN of the server responsible for the domain |
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host record |
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. |
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alias |
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. |
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Pointer (PTR) |
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. |
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mail exchanger (MX) |
The _____________ record is used to specify which servers accept mail for this domain. Each _________ record contains two parameters—a preference and a mail server |
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Service (SRV) |
____________ records tie together the location of a service (like a domain controller) with information about how to contact the service. |
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Domain name |
SRV record structure:Domain for which this record is valid |
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TTL |
SRV record structure: Time to live (86,400 seconds). |
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Class |
SRV record structure: This field is always IN, which stands for Internet. |
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Record type |
SRV record structure: Type of record (SRV). |
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Priority |
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). |
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Weight |
SRV record structure: Service records with equal priority are chosen according to their weight (100). |
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Port number |
SRV record structure: The port where the server is listening for this service (389). |
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Target |
SRV record structure: The FQDN of the host computer |