On this slide we have the information about recursive and interactive querist even more information
about this Querist.
I've mentioned them in previous slides but here we can see even more information.
So in a recursive query DNS server receiving the name resolution Reclast takes full responsibility for
resolving the name in interactive Querrey the server that receives the name resolution request immediately
response for the best information it possesses.
So if it doesn't care for information on this request it immediately response that it doesn't have.
Please ask some other DNS server please note that in most cases it would be improper to configure one
DNS server to send a recursive query to another DNS server.
It only can happen when we configure forwarder than this forwarder is responsible for all querist from
other DNS servers to some external for example resources.
Think about forwarder as Ayahs.
PS DNS server
one of the scenarios in which DNS servers Samter recursive queries to other DNS servers is when you
configure server to function as a forwarder on a network run in several DNS servers.
You might not want all this sort of sand and querist to other DNS servers in the Internet.
If the network has a relatively slow connection to the Internet for example several Suroosh with meet
in repeated Guerreros my queues to march of the available bandwidth to prevent this.
The Windows DNS server enables you to configure one server to function as a forwarder for all Internet
queries generated by the other servers on the network.
Now let's look through those types Leora size zone types in Windows or on DNS.
Primaries alone secondary's alone and Stobbs all primaries all creates a primary zone that contains
the master copy of the zone database where admin and administrators make all changes to the zones Russos
records.
If a zone is not stored in the active directory the server creates a primary Mostert zone database file
on the local drive.
So this file is stored on a local drive and it has its address and you can configure and change this
file to update primer is.
But it is much more simple when you have a D integrated zone who will talk about it later.
What other benefits are the advantages of keeping the ozone Adium to great secondaries alone.
Is it's just the copy of primary zone which is kept on another server and it is updated when the primary
zone is updated.
So it is only Read-Only corporate and it is nice to only when the primary zone is changed Stobbs zone
just contains the key resource records and when there is a request for some information you just forwards
the request to the host of The Zone or replies with a referral to that host depending on whether the
query is recursive or iterative even more information about zone types her primary zone DNS zone is
required for DNS functionality and name resolution for of any domain name and primary DNS zone is both
authoritative for the zone and the primary point of storage for the secondary zone is not required and
not authoritative but are useful to read Usenet for traffic and provide foster name resolution especially
not use in an active directory integrated primary.
Use an active directory integrated zones.
So there are quite many advantages of using integrated zones instead of file based loans.
So this advantages are the conservation of network bandwidth and increased security zone files are replicated
automatically.
Along with all our other domain control as in demand and active directory data you can modify the DNS
resource records on and the right to build domain controller host and a cold of the zone data and active
directory will automatically update all the other domain controllers.
You don't have to create secondary's zones or manually configure zone transfers because Active Directory
performs all database replication activities.
You can also create a custom replication scope that copies the database to the domain controllers you
specify Active Directory conserves net for bandwidth by your application only the DNS data that has
changed since the last replication.
And by compressing the data before transmitted over the Internet the zone replications also use the
Fool's security capabilities of active directory including encryption and Kerberos based authentication
which is more a lost than loss of file based loan transfers.
DNS records there are a number of records which are used in DNS.
We'll take a look at most commonly used records such as host tracker or a record a record is used in
IP version 4.
And what a record this is pronounced as what a record is used in the IP version 6.
This record resolves a particular name to an IP address.
Note that the records are self-created.
When the machine is joint to the domain when the machine is not joined to the domain you have to add
the records manually and configure the file.
The DNS file the next record is LS record to see Name records.
This is a record that you can create which takes a name and points to another name.
An example is of one long record which points to one shot record.
For example long name pointing to the name just where
that good then the the next record is mail exchange or mix record and then mix record tells the domain
where to point for its email services name servers name server or unearths record points which DNS server
to use as authority for long and the last one is part of a sort.
Or as a record.
This record indicates that the server is the best authoritative source for data concerning the zone
each zone must have.
And C as o a record and only one as a record can be in a zone only only one record and the last slide
is about tools and utilities which can help when troubleshooting DNS related issues.
The first tool to use is IP config.
To.
Sorry I'll take apan I become fake with Slash Fleisch DNS.
This forces the client to destroy its locally cast cast copies of DNS resolver records and gets new
information that is current from the DNS server which is always helpful when you have a new record and
you cannot resolve this record from the server because your client gets the information from locally
cached corpus of DNS server and another one is epicanthic display DNS.
This shows the contents of your local DNS cache and you can view all the contents with this utility.
This command system administrator sulfonylureas and asked to look up to.
This is very good and robust to event viewer.
NET mourner's troll for network information on the server DNS as M.D And of course being resolved pinna
we cannot know if the server is available and is reached.
So is the first tool which should be used.
You can always get more information on the Internet.
This links are the ones which I've used to prepare these slides.
So take a look and maybe they could be of use for you.