Bind Name Server Interview Questions & Answers part 2

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Q: – 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.

Q: – what is Stealth name server?

Stealth name server is a secret server. This type of name server is not published anywhere. It is only known to the servers that have its IP address statically listed in their configuration. It is an authoritative server. It acquires the data for the zone with the help of a zone transfer. It can be the main server for the zone. Stealth servers can be used as a local backup if the local servers are unavailable.

Q: – What do you mean by "Resource Records"?

Information on domain names and their IP addresses, as well as all the other information distributed via DNS is stored in the memory of name servers as Resource Records(RR).

Q: – 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.

Q: – Tell me 5 Types of DNS records?

A, NS, CNAME, SOA, PTR, MX.

Q: – explain "SOA Record"?

The Start of Authority(SOA) record determines the name server that is an authoritative source of information for the particular domain. There is always only one SOA record in the file, and it is placed at the beginning of the file of authoritative resource records.

Q: – what is "A Record"

A (Address) records assign IP addresses to domain names of computers. The IP address cannot have a dot at the end.

Q: – Explain "CNAME Record"?

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

Q: – What are "HINFO and TXT Records"?

HINFO and TXT records are for information only. An HINFO record has two items in its data part. The first item is information about hardware, and the second one is information about software. A TXT record contains a general data string in its data part.
Example :
test.com IN SOA …

mail IN A 192.1.1.2
IN HINFO My_Server UNIX
IN TXT my server

Q: – 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.

test.com IN SOA …

mail                IN        A         192.1.1.2
IN       HINFO    AlphaServer UNIX
IN       TXT       my  server
IN       MX   30    mail2.nextstep4it.com
IN        MX   20    mail3.nextstep4it.com
IN        MX   10    mail2.nextstep4it.com

Q: – Explain "PTR Records"?

A Pointer Record(PTR) is used to translate an IP address into a domain name.

Q: – What is Dynamic DNS?

Dynamic DNS a method of keeping a domain name linked to a changing IP address as not all computers use static IP addresses. Typically, when a user connects to the Internet, the user's ISP assigns an unused IP address from a pool of IP addresses, and this address is used only for the duration of that specific connection. This method of dynamically assigning addresses extends the usable pool of available IP addresses. A dynamic DNS service provider uses a special program that runs on the user's computer, contacting the DNS service each time the IP address provided by the ISP changes and subsequently updating the DNS database to reflect the change in IP address.

Submitted By:-Anshu            Email-ID: – anshu.raahti@gmail.com

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