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Windows DNS Server Interview Questions !

> Your company uses ten domain controllers, three of which are also used as DNS servers. You have one companywide AD-integrated zone, which contains several thousand resource records. This zone also allows dynamic updates, and it is critical to keep this zone up-to-date. Replication between domain controllers takes up a significant amount of bandwidth. You are looking to cut bandwidth usage for the purpose of replication. What should you do?

Change the replication scope to all DNS servers in the domain.

>You are administering a network connected to the Internet. Your users complain that everything is slow. Preliminary research of the problem indicates that it takes a considerable amount of time to resolve names of resources on the Internet. What is the most likely reason for this?

DNS servers are not caching replies.. Local client computers are not caching replies… The cache.dns file may have been corrupted on the server.

> Explain TTL?
Time to live. A 32-bit number indicating the time the particular RR can be kept valid in a server cache. When this time expires, the record has to be considered invalid. The value 0 keeps nonauthoritative servers from saving the RR to their cache memory.

> Explain CNAME Record?
Synonyms to domain names can be created using CNAME records. This is often referred to as 'creating aliases for computer names'.

>What are MX Records?
MX records specify the mailing server of the domain. An MX record shows to which computer a mail of a particular domain should be sent. The MX record also includes a priority number, which can be used to determine several computers where the mail for the domain can be sent. The first attempt is to deliver the mail to the computer with the highest priority (lowest value). If this attempt fails, the mail goes to the next computer (with a higher priority value), and so on.

>What are New DNS features in Windows Server 2008 ?
The DNS Server role in Windows Server 2008 contains four new or enhanced features that improve the performance of the DNS Server service or give it new abilities:

1. Background zone loading: DNS servers that host large DNS zones that are stored in Active Directory Domain Services (AD DS) are able to respond to client queries more quickly when they restart because zone data is now loaded in the background.

2. IP version 6 (IPv6) support: The DNS Server service now fully supports the longer addresses of the IPv6 specification.

3. for read-only domain controllers (RODCs): The DNS Server role in Windows Server 2008 provides primary read-only zones on RODCs.

4. Global single names: The GlobalNames zone provides single-label name resolution for large enterprise networks that do not deploy Windows Internet Name Service (WINS). The GlobalNames zone is useful when using DNS name suffixes to provide single-label name resolution is not practical.

5. Global query block list: Clients of such protocols as the Web Proxy Auto-Discovery Protocol (WPAD) and the Intra-site Automatic Tunnel Addressing Protocol (ISATAP) that rely on DNS name resolution to resolve well-known host names are vulnerable to malicious users who use dynamic update to register host computers that pose as legitimate servers. The DNS Server role in Windows Server 2008 provides a global query block list that can help reduce this vulnerability.

>What are the benefits of using Windows Server 2003 DNS when using AD-integrated zones?

If your DNS topology includes Active Directory, use Active Directory integrated zones. Active Directory integrated zones enable you to store zone data in the Active Directory database.Zone information about any primary DNS server within an Active Directory integrated zone is always replicated.

Because DNS replication is single-master, a primary DNS server in a standard primary DNS zone can be a single point of failure. In an Active Directory integrated zone, a primary DNS server cannot be a single point of failure because Active Directory uses multimaster replication.

Updates that are made to any domain controller are replicated to all domain controllers and the zone information about any primary DNS server within an Active Directory integrated zone is always replicated.
Active Directory integrated zones: Enable you to secure zones by using secure dynamic update.

Provide increased fault tolerance. Every Active Directory integrated zone can be replicated to all domain controllers within the Active Directory domain or forest. All DNS servers running on these domain controllers can act as primary servers for the zone and accept dynamic updates.

Enable replication that propagates changed data only, compresses replicated data, and reduces network traffic. If you have an Active Directory infrastructure, you can only use Active Directory integrated zones on Active Directory domain controllers.If you are using Active Directory integrated zones, you must decide whether or not to store Active Directory integrated zones in the application directory partition.

You can combine Active Directory integrated zones and file-based zones in the same design. For example, if the DNS server that is authoritative for the private root zone is running on an operating system other than Windows Server 2003 or Windows 2000, it cannot act as an Active Directory domain controller. Therefore, you must use file-based zones on that server. However, you can delegate this zone to any domain controller running either Windows Server 2003 or Windows 2000.

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