RHEL5/6 Interview Questions : DNS
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1. There are four types of DNS servers. Name them.
1a. The four types of DNS servers are master, slave, caching-only, and forwarding.
2. What is the difference between an A record and a PTR record?
2a. An A record translates translated hostnames to IP addresses, and a PTR record works the other way around.
3. A slave DNS server offers no additional benefits. True or False?
3a. False. A slave DNS server provides load balancing and redundancy benefits.
4. What is the rndc utility used for?
4a. The rndc utility provides a method for managing the DNS server remotely and securely.
5. What command can you use to test the config files before starting the DNS service?
5a. service named configtest
6. What three commands can you use to help verify that the DNS server is functioning properly?
6a. The dig, host, and ping commands can be used to test DNS server functionality.
7. What port must be opened on the firewall for DNS?
7a. DNS uses port 53.
8. What does the rdnc-confgen command do?
8a. The rdnc-confgen command generates an rndc.conf file for the rndc utility.
9. What port does the rndc utility listen on by default?
9a. By default, the rndc utility listens on port 953.
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