DNS Server Interview Questions And Answers
Posted: Fri Oct 31, 2014 5:11 pm
1. What is BIND ?
BIND stands for Berkeley Internet Name Domain which is the most commonly used Domain Name System (DNS) server on the Internet.
2. What is the role of DNS ?
A DNS server, or name server, is used to resolve an IP address to a hostname or vice versa.
3. What is round robin DNS?
Round robin DNS is usually used for balancing the load of geographically distributed Web servers. For example, a company has one domain name and three identical home pages residing on three servers with three different IP addresses. When one user accesses the home page it will be sent to the first IP address. The second user who accesses the home page will be sent to the next IP address, and the third user will be sent to the third IP address. In each case, once the IP address is given out, it goes to the end of the list. The fourth user, therefore, will be sent to the first IP address, and so forth.
4.What is Name Server?
A name server keeps information for the translation of domain names to IP addresses and IP addresses to domain names. The name server is a program that performs the translation at the request of a resolver or another name server.
5. 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.
6. What is the role of "named-checkconf Utility"?
The named-checkconf utility checks the syntax of the named.conf configuration file.
Syntax: named-checkconf [-t directory] [filename]
7. What is the role of "named-checkzone Utility"?
The named-checkzone utility checks the syntax and consistency of the zone file.
Syntax: named-checkzone [-dgv] [-c class] zone [filename]
BIND stands for Berkeley Internet Name Domain which is the most commonly used Domain Name System (DNS) server on the Internet.
2. What is the role of DNS ?
A DNS server, or name server, is used to resolve an IP address to a hostname or vice versa.
3. What is round robin DNS?
Round robin DNS is usually used for balancing the load of geographically distributed Web servers. For example, a company has one domain name and three identical home pages residing on three servers with three different IP addresses. When one user accesses the home page it will be sent to the first IP address. The second user who accesses the home page will be sent to the next IP address, and the third user will be sent to the third IP address. In each case, once the IP address is given out, it goes to the end of the list. The fourth user, therefore, will be sent to the first IP address, and so forth.
4.What is Name Server?
A name server keeps information for the translation of domain names to IP addresses and IP addresses to domain names. The name server is a program that performs the translation at the request of a resolver or another name server.
5. 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.
6. What is the role of "named-checkconf Utility"?
The named-checkconf utility checks the syntax of the named.conf configuration file.
Syntax: named-checkconf [-t directory] [filename]
7. What is the role of "named-checkzone Utility"?
The named-checkzone utility checks the syntax and consistency of the zone file.
Syntax: named-checkzone [-dgv] [-c class] zone [filename]