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SOA Resource Records
Every zone contains a Start of Authority (SOA) resource record at the beginning of the zone. SOA resource records include the following fields:
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The Owner , TTL , Class , and Type fields, as described in "Resource Record Format" earlier in this chapter.
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The authoritative server field shows the primary DNS server authoritative for the zone.
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The responsible person field shows the e-mail address of the administrator responsible for the zone. It uses a period (.) instead of an at symbol (@).
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The serial number field shows how many times the zone has been updated. When a zone's secondary server contacts the master server for that zone to determine whether it needs to initiate a zone transfer, the zone's secondary server compares its own serial number with that of the master. If the serial number of the master is higher, the secondary server initiates a zone transfer.
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The refresh field shows how often the secondary server for the zone checks to see whether the zone has been changed.
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The retry field shows how long after sending a zone transfer request the secondary server for the zone waits for a response from the master server before retrying.
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The expire field shows how long after the previous zone transfer the secondary server for the zone continues to respond to queries for the zone before discarding its own zone as invalid.
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The minimum TTL field applies to all the resource records in the zone whenever a time to live value is not specified in a resource record. Whenever a resolver queries the server, the server sends back resource records along with the minimum time to live. Negative responses are cached for the minimum TTL of the SOA resource record of the authoritative zone.
What else can I help you with?
Which DNS records identifies a mail server?
mx
What is soa in active directory?
SOA Resource Records Every zone contains a Start of Authority (SOA) resource record at the beginning of the zone. SOA resource records include the following fields: * The Owner , TTL , Class , and Type fields, as described in "Resource Record Format" earlier in this chapter. * The authoritative server field shows the primary DNS server authoritative for the zone. * The responsible person field shows the e-mail address of the administrator responsible for the zone. It uses a period (.) instead of an at symbol (@). * The serial number field shows how many times the zone has been updated. When a zone's secondary server contacts the master server for that zone to determine whether it needs to initiate a zone transfer, the zone's secondary server compares its own serial number with that of the master. If the serial number of the master is higher, the secondary server initiates a zone transfer. * The refresh field shows how often the secondary server for the zone checks to see whether the zone has been changed. * The retry field shows how long after sending a zone transfer request the secondary server for the zone waits for a response from the master server before retrying. * The expire field shows how long after the previous zone transfer the secondary server for the zone continues to respond to queries for the zone before discarding its own zone as invalid. * The minimum TTL field applies to all the resource records in the zone whenever a time to live value is not specified in a resource record. Whenever a resolver queries the server, the server sends back resource records along with the minimum time to live. Negative responses are cached for the minimum TTL of the SOA resource record of the authoritative zone.
What are authoritative dns server and none authoritative dns server?
authoritative dns server is server that has own databases that has name resolution for the clients that for resolve from name to ip address and for ip address to name. non-authorititative dns server is server that forward request of dns client to authoritative dns server for resolve.
If you have not modified the default settings for dns on the dhcp client or server what client record or records will the dhcp server update in dns?
A. The PTR resource record.
Which record is the first record created for a zone on a DNS Server?
Start of Authority (SOA) is the first record in the zone file. It contains the name of the primary DNS Server, which must correspond to an Name Server (NS) record in the file, the administrator's e-mail address and the length of time records can be cached before going back to the authoritative DNS server.
What is stubzone?
Stub zones are copies of a zone that contain only the resource records that are necessary to identify the authoritative DNS server for that zone. A stub zone contains a subset of zone data consisting of a SOA, NS, and A record, also known as a glue record. A stub zone is like a bookmark that simply points to the DNS server that is authoritative for that zone. Stub zones can be used where root hints point to an internal DNS server rather than to the root servers on the Internet. For security purposes, the DNS server is designed only to resolve certain zones. Thaslim thaslimca007@gmail.com
What identifies the realm in which a server or computer resides?
identifies the realm in which a server computer resides
Which types of dns records does a domain client use to find a domain controller?
NS 2 RFC 1035 Name Server. Defines the authoritative name server(s) for the domain (defined by the SOA record) or the subdomain. SOA
Explain the difference between a local name server and an authoritative name server?
A host's authoritative name server provides the "official" translation of a hostname to an IP address (among other things). A host's local name server is a proxy to the DNS system: the host first queries its local name server for a mapping; the local name server then obtains the mapping on the behalf of the querying host.
Which resource record is used to resolve domain names specified in email addresses to the ip addresses of the mail server assosiated with the domain?
MX records.
What is stub Zone?
Stub zone When a zone that this DNS server hosts is a stub zone, this DNS server is a source only for information about the authoritative name servers for this zone. The zone at this server must be obtained from another DNS server that hosts the zone. This DNS server must have network access to the remote DNS server to copy the authoritative name server information about the zone. You can use stub zones to: * Keep delegated zone information current. By updating a stub zone for one of its child zones regularly, the DNS server that hosts both the parent zone and the stub zone will maintain a current list of authoritative DNS servers for the child zone. * Improve name resolution. Stub zones enable a DNS server to perform recursion using the stub zone's list of name servers, without having to query the Internet or an internal root server for the DNS namespace. * Simplify DNS administration. By using stub zones throughout your DNS infrastructure, you can distribute a list of the authoritative DNS servers for a zone without using secondary zones. However, stub zones do not serve the same purpose as secondary zones, and they are not an alternative for enhancing redundancy and load sharing. There are two lists of DNS servers involved in the loading and maintenance of a stub zone: * The list of master servers from which the DNS server loads and updates a stub zone. A master server may be a primary or secondary DNS server for the zone. In both cases, it will have a complete list of the DNS servers for the zone. * The list of the authoritative DNS servers for a zone. This list is contained in the stub zone using name server (NS) resource records. When a DNS server loads a stub zone, such as abc.xyz.com, it queries the master servers, which can be in different locations, for the necessary resource records of the authoritative servers for the zone abc.xyz.com. The list of master servers may contain a single server or multiple servers, and it can be changed anytime.
What is the difference between an SOA and a NS record in DNS?
SOA 6 RFC 1035 Start of Authority. Defines the zone name, an e-mail contact and various time and refresh values applicable to the zone. NS 2 RFC 1035 Name Server. Defines the authoritative name server(s) for the domain (defined by the SOA record) or the subdomain.
