DNS

Question 1

DNS

Answer 1

domain name system

Question 2

what is DNS?

Answer 2

dns is a worldwide distributed directory of network info. the hostname which gets translated into a IP adress is through DNS. dns stores a wide variety of records.

Question 3

what is the best known dns record and what is it?

Answer 3

A record. it is used to find the adress of a computer connected to the internet from a name. A stands for adress and maps a name like www.example.com into an ipv4 adress.

Question 4

what can DNS domains be used as part of?

Answer 4

can be used as part of security mechanisms for HTTP and SSL encryption and cookie privacy.

Question 5

how can you get the DNS?

Answer 5

E.g. for example.com: To get the DNS the client asks the caching server for the A record for the domain. If the caching server doesn’t have this info in its cache, the caching server then asks the root server for .com top-level domain name server record. It then asks the .com name server for example.com name server record. The caching server then asks example.com name server for the the A record. A record is then passed back to the caching serverwhich then sends it back to the client. The record is then stored in the caching server for the duration of the TTL.

Question 6

common top level domains

Answer 6

.com
.co.uk
.org
.edu