Now let's talk about managing zone delegation.
DNS zone delegation delegates the administration of DNS though with a list you can see why the large
zone into smaller Saab's zones to distribute the load and to improve performance.
So for example if lap dot com has several sub zones tasked dot dot com i t dot lap dot com research
dot lobbed dot com and so on.
You can delegate Asop zone to a different DNS server to distribute the load Taynton best relative overhead
to add a delegation for that I need dot dot com to server lab DC to use the following command.
And the DNS server zone delegation with the following parameters name ALAP dot com child zone name I-T
IP address 192 one sixty eight thirty six name server Leptis to dot dot lap dot com and pass through
parameter the DNS server alone delegation group of common let's include the verbs and get remove and
set use the set command.
Does DNS servers on delegation common lead to change the IP address or addresses to reach to delegate
let alone this doesn't add to the existing delegation IP address but replaces it.
So for example to change the delegation for eyeteeth sub zone of Lappe dot com through the DNS server
Labadie says 3.
Use the following command.
Cert does DNS server alone delegation with the following parameters name Child loan.
In my case it's 80 IP addresses and name server.
In my case it's lab This is three dirt lap dot com sorry dot dot lap dot com.
Now let's take a closer look.
To managing DNS records.
DNS servers do more than simply translate a computer name into IP address though it's certainly the
first and primary duty.
They also provide the information that other services and servers need to know which server hosts a
particular service.
So for example Internet mail servers need to know which server in a lab dot com is the mail server for
all of web dot com email and other clients and so forth.
All the lab dot com network need to know which servers are official name servers for the zone.
Each of these services is designated by a specific type of DNS resource record.
The basic a or what a resource record translates DNS name into an IP version 4 or IP version 6 address
respectively and makes a resource record specifies the mail server for the domain and an -- or a service
record.
I used to specify the server name servers for the dummy Windows DNS supports a wide variety of DNS records.
But the core resource records are there for him.
Some of them I've already mentioned that's a record Gawad a record c name record d s record DNS record
and mix and S and BTR.
Also we've got next year record as a record and Esera we record.
So let's review those records.
A record is for an IP version for hosta dress record quarte a record is for IP version 6 host address
record see name record is for canonical name record the same record facilitates the use of more than
one resource record to refer to a single host.
The US had delegated Sinar record that the US record has used with domain name system security extensions
and abbreviation for it is DNS SEC to designate the Saab's zone sign in key DNS record.
It's for private key record for DNS SEC signed I mix record and mail exchange or record and mix record
identifies the e-mail server for a domain there can be multiple mix records for a domain and record
and name server record and record identifies and name software for the domain.
There can be multiple Alnus records in a domain BTR record a point to record the PDR record is a reverse
look up record that translates an IP address into a hostname pity our records can be IP version 4 or
IP version 6 addresses the exterior occurred at text record the text your record is used to assign and
formatted text to host in DNS echo many use of text records is for sender policy framework or SPF records
use to identify legitimate email that senders is all a record and start of a songwriter record.
So our record is a version number record identifying the version number of the DNS zone and S.R.O will
record a service record their service record identifies the host name and part number of service for
the specified service.
All of the records listed here can be created or changed by using the Windows power cell DNS server
resource record.
Come on let's.
With the exception of the saw record saw records are automatically updated whenever a changes made to
the DNS.
In addition to the general at the DNS server resource record come left which can be used to make all
support to resource records.
There are specific at the moment.
Let's for that a record would a record see a name DNS DNS Skeat and makes and between our resource records.
Let's take a look at these records with get Cal command real.
Get help at does DNS server a resource record asterisk by it to form a table with auto parameter and
formatted by name and Cynapsus.
Now to region records let's create name or a or quite a resource records the process for create in any
DNS resource record is essentially the same low each record type has said it's appropriate to the time.
So for example to create an A record for the server lab DC to be that we can use the following command
at Desch DNS server resource record a zone name Lepp dot com the record type Belbek a name lab DC to
IP version 4 address one 19 one sixty eight.
So the end of six grid BTR and pass through parameter This uses the general at DNS server resource record
command left.
Therefore I need to specify the record type A's and because I'm also running a reverse lookup long I
can at the Create BTR parameter to automatically create the Peachi resource record for this server.
The results are displayed back to consol because we use pass through parameter and remember that if
you don't use pass through parameter the results will be completely silent.
Now let's use less specific and DNS server resource record a command left to create the same DNS A record
and we'll use the following command at the DNS server resource record a busy parameter lone name and
in quotes lab dot com we also use parameters such as name IP version 4 address grid BTR and pass through
parameter.
So as you can see there is a specific moment left for some record types you could use either the first
option or the second option as you like.
And also remember that you can always check the syntax for the command let let check the syntax for
ad DNS server or a service record common blood type syntax and the command.
Let me get a pretty long list of the syntax which can be used in this common let create another resource
record see name Recker the same name Recker sometimes Coulter's.
It's a canonical record you can use to add an additional host name to a server name record points to
an existing hostname record.
When the DNS server receives an inquiry for the name in the name record it looks like a record for the
host name that the C name points to and returns the IP version 4 address for that hostname to create
a name record for a server.
Let's say router that points to a to the A record for the fullerenes server name we can use the following
command.
And DNS server resource record a zone name See name the name Israel be using for this server.
In my case it's a router hostname ls.
Here we can we should type the full address of our server of fully qualified domain name and pass through
parameter.
You can of course useless the name specific common Blut most common let's produce exactly the same record
and produce no visible output.
Please remember that parse through parameter shows you the output.
Now let's create a MX record source record that makes resos record a mail exchange or record that is
used by simple mail transfer protocol or S-M T.P. servers to identify which host or hosts in a domain
handle email for the domain that makes record includes a mail server priority field that enables you
to have backup mail servers.
The email is always delivered to the server with the lowest well here in the mail server priority field
in the servers and makes MX record.
So for example if you have dot com has a primary mail server named mail dot flag dot com and a backup
mail server or a named mail to dot lap dot com you would create two mix records for that domain.
Reduce the fall in command left at the DNS server resource record dush zone name in quotes the name
of our zone and the following parameters name and makes mail exchange reference Antrel use preference
turn for this exchange server and we'll also add a record for the preference 22 for the backup mail
server with the following command and DNS server resource record zone name name and makes mail exchange.
In this case it will be mailed to dot lab dot com and preference equals Trente.
And the last example is for a service record to create an interview record for network news transfer
protocol and A.P. server which will be listening on port 119.
We can use the following command at der's DNS server or resource record his own name Lepp dot com name
underscore and a.p dot underscore is simply the record stype field bit as are we domain name of this
server will be our lap.
So be one dot lap dot com port 119 priority zero weight zero and Bastro parameter.
And please remember that for complete details on the perimeter supported for a particular resource record
you can type get help command left.
So always remember to use GET HELP command and to get most up to date version of help us get help with
the dush online perimeter.
Some notes about configuring zones scavenging and Asian use said DNS servers scavenges in command led
to config and enable DNS zone scan engine Luscum and learn to accept parameters relate to scare engine
intervals refresh times and which zones to apply to scavenge and to use the start DNS servers kerogen
come and let tostadas kerogen.
However scavenging will not actually happen unless Scavenging is unlabelled for the server and the zone
the zone is started.
Resource record kever times to use get DNS servers karenge and command lead to get information on the
current state of scavenging to configure a certain for all zones and scavenge an interval for four days
a refresh interval for three days and no refresh interval of zero use the following command certain
days dentals scavenging Sorriso DNS servers square engine with the full perimeter scare engine state
square engine interwove refresh interval and no refresh interval apply on all zones and pass through
parameter.
You can also configure record options including time to leave or TTL and wait parameters.