Wednesday, September 5, 2012

Windows DNS Server Interview Questions –Part1



Windows DNS Server Interview Questions –Part1

1.What is the main purpose of a DNS server?
DNS servers are used to resolve FQDN hostnames into IP addresses and vice versa.
2.What is the port no of dns ?
53.
3.What is a Forward Lookup?
Resolving Host Names to IP Addresses.
4.What is Reverse Lookup?
It?s a file contains host names to IP mapping information.
5.What is a Resource Record?
It is a record provides the information about the resources available in the N/W infrastructure.
6.What are the diff. DNS Roles?
Standard Primary, Standard Secondary, & AD Integrated.
7.What is a Zone?
Zone is a sub tree of DNS database.
8.Secure services in your network require reverse name resolution to make it more difficult to launch successful attacks against the services. To set this up, you configure a reverse lookup zone and proceed to add records. Which record types do you need to create?
PTR Records
9.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.
10.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 .

11.What is primary, Secondary, stub & AD Integrated Zone?
Primary Zone: - zone which is saved as normal text file with filename (.dns) in DBS folder. Maintains a read, write copy of zone database.
Secondary Zone: - maintains a read only copy of zone database on another DNS server. Provides fault tolerance and load balancing by acting as backup server to primary server.
Stub zone: - contains a copy of name server and SOA records used for reducing the DNS search orders. Provides fault tolerance and load balancing

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