DNS related questians and answers...

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What is the main purpose of a DNS server?
DNS servers are used to resolve FQDN hostnames into IP addresses and vice versa.
What is the port no of dns ?
53.
What is a Forward Lookup?
Resolving Host Names to IP Addresses.
What is Reverse Lookup?
Resolving  IP Addresses to  Host Names.
What is a Resource Record?
It is a record provides the information about the resources available in the N/W infrastructure.
What are the diff. DNS Roles?
Standard Primary, Standard Secondary, & AD Integrated.
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
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 .

Comments

  1. subhiNovember 18, 2011 at 12:26 PM

    SOA
    Description: Start of authority (SOA) resource record. Indicates the name of origin for the zone and contains the name of the server that is the primary source for information about the zone. It also indicates other basic properties of the zone. The SOA resource record is always first in any standard zone. It indicates the DNS server that either originally created it or is now the primary server for the zone. It is also used to store other properties such as version information and timings that affect zone renewal or expiration. These properties affect how often transfers of the zone are done between servers authoritative for the zone. For more information, see Managing authority records.

    ReplyDelete
  2. subhiNovember 18, 2011 at 11:49 PM

    A stub zone is like a secondary zone in that it obtains its resource records from other name servers (one or more master name servers). A stub zone is also read-only like a secondary zone, so administrators can't manually add, remove, or modify resource records on it. But the differences end here, as stub zones are quite different from secondary zones in a couple of significant ways.

    First, while secondary zones contain copies of all the resource records in the corresponding zone on the master name server, stub zones contain only three kinds of resource records:

    A copy of the SOA record for the zone.
    Copies of NS records for all name servers authoritative for the zone.
    Copies of A records for all name servers authoritative for the zone.

    Note: STUB zone scenario is good when you have more than one forest.

    ReplyDelete

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