The experiment of DNS main, auxiliary, transferring, subdomain and its delegating under Linux

Frontier: Understand the following concepts before you do the experiment

1. What is DNS?

DNS is the abbreviation for the domain Name System, which simply resolves the domain name into an IP address.

What types of 2.DNS are divided into?

Primary Domain Name server

Secondary domain Name server

Forwarding a domain name server

Caching a domain name server

What kinds of 3.DNS query types are divided into?

The query method is divided into recursive queries (either the query succeeds or the query fails) and an iterative query (one DNS query for another DNS process)

From the query content to be divided into forward query (by domain name lookup IP address process) and reverse query (with IP address query domain name process)

4.DNS parsing sequence is usually divided into those steps?

Query the DNS cache first, query the hosts file, and finally query the DNS server.

5. Please describe the following DNS forwarder concepts?

Forwards queries that cannot be resolved by the local DNS server to other DNS servers on the network, which are designated as forwarders, and the forwarders ' queries are recursive queries.

6.DNS the role of the auxiliary domain name server?

When the primary server shuts down, fails, or is overloaded, the secondary domain name server provides the domain name resolution service as a backup.

7. Describe the following delegated concepts?

When there are too many subdomains in the zone, it is inconvenient to maintain, and with the bottleneck of the domain name query, you can delegate the child domain name to other server maintenance by creating a new delegation in the zone.

8. What is the difference between a subdomain and a delegate?

Subdomain files in parent domain files

Delegating a separate zone file

Experiment (i)

Experiment name: Main DNS structure and its test

Experimental objective: To master the main DNS structure and its client testing

Experiment topology: