Interview Questions.

Question 1. Which Are The Important Configuration Files For Dns Server ?

Answer :

BIND makes use of /and so on/named.Conf as its fundamental configuration file, the /and so on/rndc.Conf document as the configuration file for name server manage software rndc, and the /var/named/ listing for region documents and so on.

Question 2. What Is Bind ?

Answer :

BIND stands for Berkeley Internet Name Domain which is the most commonly used Domain Name System (DNS) server at the Internet.

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Question three. What Is The Role Of Dns ?

Answer :

A DNS server, or call server, is used to resolve an IP cope with to a hostname or vice versa.

Question 4. On Which Port Dns Server Works ?

Answer :

DNS servers use port fifty three by means of default. Incoming and outgoing packets have to be allowed on port 53. Also allow connections on port 921 if you configure a light-weight resolver server.

The DNS manage software, rndc, connects to the DNS server with TCP port 953 via default. If you are going for walks rndc at the call server, connections on this TCP port from localhost should be allowed. If you are jogging rndc on additional systems, permit connections to port 953 (or something port you have got selected to configure) from those additional systems.

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Question five. What Is Round Robin Dns?

Answer :

Round robin DNS is generally used for balancing the burden of geographically allotted Web servers. For instance, a corporation has one domain name and three identical domestic pages residing on 3 servers with three specific IP addresses. When one user accesses the home web page it will be despatched to the primary IP deal with. The 2nd person who accesses the home page might be sent to the next IP address, and the 1/3 consumer will be sent to the third IP cope with. In every case, as soon as the IP address is given out, it is going to the stop of the list. The fourth consumer, consequently, could be sent to the first IP deal with, and so on.

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Question 6. What Is Name Server?

Answer :

A name server continues records for the interpretation of domain names to IP addresses   and IP addresses to domain names. The call server is a software that plays the interpretation on the request of a resolver or another call server.

Question 7. What Is Primary Name Server Or Primary Master Server?

Answer :

Primary name server/primary masteris the primary records source for the quarter. It is the authoritative server for the sector. This server acquires facts about its region from databases saved on a neighborhood disk. The number one server ought to be posted as an authoritative call server for the domain within the SOA resource report, whilst the number one grasp server does now not want to be posted.

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Question 8. What Is Secondary Name Server/slave Name Server?

Answer :

Secondary call server/slave name server acquires statistics approximately the zone with the aid of copying the records from the primary name server (respectively from the grasp server) at everyday time intervals. It makes no sense to edit those databases on the secondary name servers, although they may be stored at the nearby server disk due to the fact they will be rewritten at some stage in similarly copying.

Question nine. What Is Root Name Server?

Answer :

Root name server is an authoritative call server for the basis area (for the dot). Each root call server is a number one server, which differentiates it from different name servers.

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Question 10. What Is Stealth Name Server?

Answer :

Stealth call server is a secret server. This kind of call server isn't always posted everywhere. It is only known to the servers which have its IP deal with statically indexed of their configuration. It is an authoritative server. It acquires the records for the sector with the assist of a sector transfer. It may be the main server for the region. Stealth servers can be used as a local backup if the nearby servers are unavailable.

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Question eleven. What Do You Mean By “resource Records”?

Answer :

Information on domains and their IP addresses, in addition to all the different facts disbursed through DNS is stored inside the reminiscence of name servers as Resource Records(RR).

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Question 12. Explain “ttl”?

Answer :

Time to stay. A 32-bit variety indicating the time the precise RR may be stored valid in a server cache. When this time expires, the record has to be considered invalid. The price zero maintains nonauthoritative servers from saving the RR to their cache reminiscence.

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Question thirteen. Explain “soa Record”?

Answer :

The Start of Authority(SOA) file determines the call server this is an authoritative supply of information for the precise area. There is usually only one SOA document within the report, and it's miles located at the beginning of the record of authoritative useful resource statistics.

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Question 14. What Is “a Record”?

Answer :

A (Address) records assign IP addresses to domains of computers. The IP address can not have a dot at the end.

Question 15. Explain “cname Record”?

Answer :

Synonyms to domains may be created using CNAME records. This is regularly referred to as ‘growing aliases for laptop names’.

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Question sixteen. What Are “hinfo And Txt Records”?

Answer :

HINFO and TXT facts are for facts handiest. An HINFO record has  gadgets in its records element. The first item is information about hardware, and the second is statistics about software. A TXT record incorporates a trendy information string in its records component.

Example :

check.Com IN SOA …

…

mail IN A 192.1.1.2

IN HINFO My_Server UNIX

IN TXT my server

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Question 17. What Are “mx Records”?

Answer :

MX records specify the mailing server of the area. An MX file shows to which laptop a mail of a selected area must be sent. The MX record additionally includes a concern range, which can be used to determine several computers wherein the mail for the domain can be despatched. The first attempt is to supply the mail to the pc with the best priority (lowest price). If this try fails, the mail is going to the following pc (with a better precedence cost), and so forth.

Check.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

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Question 18. Explain “ptr Records”?

Answer :

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

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Question 19. What Is Dynamic Dns?

Answer :

Dynamic DNS a method of maintaining a website name linked to a converting IP deal with as not all computer systems use static IP addresses. Typically, while a user connects to the Internet, the person’s ISP assigns an unused IP deal with from a pool of IP addresses, and this deal with is used most effective in the course of that precise connection. This technique of dynamically assigning addresses extends the usable pool of to be had IP addresses. A dynamic DNS service provider uses a unique program that runs on the consumer’s pc, contacting the DNS provider every time the IP address supplied by way of the ISP adjustments and subsequently updating the DNS database to reflect the exchange in IP cope with.

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