Wednesday, September 5, 2012

Windows DNS Server Interview Questions –Part5

Windows DNS Server Interview Questions –Part5
36.What are SRV records?
SRV are the service records, there are 6 service records. They are useful for locating the services.
37.What are the types of SRV records?
MSDCS:Contains DCs information.
TCP:Contains Global Catalog, Kerberos & LDAP information.
UDP:Contains Sites information.
Sites:Contains Sites information.
Domain DNS Zone:Conations domain?s DNS specific information.
Forest DNS zone:Contains Forest?s Specific Information.
38.Where does a Host File Reside?
39.What is SOA?
Start of Authority: useful when a zone starts. Provides the zone startup information.
40. What is a query?
A request made by the DNS client to provide the name server information.
41.What are the diff. types of Queries?
Recursion, iteration.
42. Tools for troubleshooting DNS?
43.What is WINS server? where we use WINS server? difference between DNS and WINS?
WINS is windows internet name service used to resolve the NetBIOS(computer name)name to IP address.This is proprietary for Windows.You can use in LAN.DNS is a Domain Naming System, which resolves Host names to IP addresses. It uses fully qualified domain names. DNS is an Internet standard used to resolve host names.
44.What is new in Windows Server 2003 regarding the DNS management?
When DC promotion occurs with an existing forest, the Active Directory Installation Wizard contacts an existing DC to update the directory and replicate from the DC the required portions of the directory.
If the wizard fails to locate a DC, it performs debugging and reports what caused the failure and how to fix the problem. In order to be located on a network, every DC must register in DNS DC locator DNS records. The Active Directory Installation Wizard verifies a proper configuration of the DNS infrastructure. All DNS configuration debugging and reporting activity is done with the Active Directory Installation Wizard.
45. SOA records must be included in every zone. What are they used for?
SOA records contain a TTL value, used by default in all resource records in the zone. SOA records contain the e-mail address of the person who is responsible for maintaining the zone. SOA records contain the current serial number of the zone, which is used in zone transfers.
By default, if the name is not found in the cache or local hosts file, what is the first step the client takes to resolve the FQDN name into an IP address? Performs a recursive search through the primary DNS server based on the network interface configuration.
46.How do I clear the DNS cache on the DNS server?
Go to cmd prompt and type ipconfig /flushdns .
47.What is the main purpose of SRV records?
SRV records are used in locating hosts that provide certain network services.
48.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.
49.What is the "." zone in my forward lookup zone?
This setting designates the Windows 2000 or Windows Server 2003 DNS server to be a root hint server and is usually deleted. If you do not delete this setting, you may not be able to perform external name resolution to the root hint servers on the Internet.
50. Do I need to configure forwarders in DNS?
No. By default, Windows 2000 DNS uses the root hint servers on the Internet; however, you can configure forwarders to send DNS queries directly to your ISP's DNS server or other DNS servers. Most of the time, when you configure forwarders, DNS performance and efficiency increases, but this configuration can also introduce a point of failure if the forwarding DNS server is experiencing problems.
The root hint server can provide a level of redundancy in exchange for slightly increased DNS traffic on your Internet connection. Windows Server 2003 DNS will query root hints servers if it cannot query the forwarders.

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