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Windows DNS Server Interview Questions

> What is the use of Stub zone ?
1. 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.

2. 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.

3. 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.

> What is a Resource Record?
It is a record provides the information about the resources available in the N/W infrastructure.

> What are the types of Resource Records in DNS ?
Different types of resource records can be used to provide DNS-based data about computers on a TCP/IP network. This section describes the following resource records:
1. SOA - Every zone contains a Start of Authority (SOA) resource record at the beginning of the zone.
2. NS - The name server (NS) resource record indicates the servers authoritative for the zone.
3. A - The address (A) resource record maps an FQDN to an IP address.
4. PTR - The pointer(PTR) resource record,in contrast to the A resource record, maps an IP address to an FQDN.
5. CNAME - The canonical name (CNAME) resource record creates an alias (synonymous name) for the specified FQDN.
6. MX - The mail exchange (MX) resource record specifies a mail exchange server for a DNS domain name.
7. SRV - Service (SRV) resource records enable you to specify the location of the servers for a specific service, protocol, and DNS domain.

> How do you manually create SRV records in DNS?
This is on windows server go to run ---> dnsmgmt.msc rightclick on the zone you want to add srv record to and choose "other new record" and choose service location(srv).

> What is the main purpose of SRV records ?
SRV records are used in locating hosts that provide certain network services.

> Before installing your first domain controller in the network, you installed a DNS server and created a zone, naming it as you would name your AD domain. However, after the installation of the domain controller, you are unable to locate infrastructure SRV records anywhere in the zone. What is the most likely cause of this failure ?
The zone you created was not configured to allow dynamic updates. The local interface on the DNS server was not configured to allow dynamic updates.

> What is Name Server?
A name server keeps information for the translation of domain names to IP addresses and IP addresses to domain names. The name server is a program that performs the translation at the request of a resolver or another name server.

> What is Primary name server or primary master server?
Primary name server/primary masteris the main data source for the zone. It is the authoritative server for the zone. This server acquires data about its zone from databases saved on a local disk. The primary server must be published as an authoritative name server for the domain in the SOA resource record, while the primary master server does not need to be published.

>What is Secondary name server/slave name server?
Secondary name server/slave name server acquires data about the zone by copying the data from the primary name server (respectively from the master server) at regular time intervals. It makes no sense to edit these databases on the secondary name servers, although they are saved on the local server disk because they will be rewritten during further copying.

> Which of the following conditions must be satisfied to configure dynamic DNS updates for legacy clients ?
The zone to be used for dynamic updates must be configured to allow dynamic updates. The DHCP server must support, and be configured to allow, dynamic updates for legacy clients.

> At some point during the name resolution process, the requesting party received authoritative reply. Which further actions are likely to be taken after this reply ?
After receiving the authoritative reply, the resolution process is effectively over.

> Name few benefits of using AD-integrated zones.
1. Multimaster update and enhanced security based on the capabilities of Active Directory.
2. Zones are replicated and synchronized to new domain controllers automatically whenever a new one is added to an Active Directory domain.
3. By integrating storage of your DNS zone databases in Active Directory, you can streamline database replication planning for your network.
4. Directory replication is faster and more efficient than standard DNS replication.

> What is Root name server?
Root name server is an authoritative name server for the root domain (for the dot). Each root name server is a primary server, which differentiates it from other name servers.

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