Summary

In this chapter, we have examined how to install and configure a DNS server. Since DNS is a complex topic, you should read the man pages for the daemons utilized for DNS services.

Questions

1.	Which of the following is a fully qualified domain name ? savannah 255.0.0.0 savannah. georgia .com 192.23.34.255
2.	Which of the following is a valid /etc/ hosts entry? 204.168.14.23 leura 10.168.14.23 204.168.14.23 leura leura.paulwatters.com loghost leura 204.168.14.23 leura.paulwatters.com loghost leura leura.paulwatters.com 204.168.14.23
3.	Which of the following is defined in named.root ? Root name server data required to initialize the DNS server cache Authorization for the root user to set up DNS services Access permissions for nonroot users to access DNS data installed by root Zone data for hosts within the local root NIS+ domain
4.	Which of the following is defined in /etc/defaultdomain ? The fully qualified domain name of the localhost The default web site domain to connect through using Netscape The name of the local NIS+ domain The name of the local DNS domain
5.	What is the purpose of nslookup ? To resolve IP addresses using hostnames only To resolve hostnames using IP addresses only To resolve both hostnames or IP addresses given an IP address or hostname To look up a list of users who can edit zone files
6.	What fields can be found in the SOA record? origin, mail addr, serial, refresh, retry , expire, minimum ttl original serial, mail refresh, ttl retry, expiry date original serial, mail addr, ttl retry, ttl expire, minimum refresh origin, serial date, refresh time, retry, expire, minimum ttl
7.	What command can be used to resolve IP addresses on the command line? zip resolve list nslookup
8.	What is the purpose of the server statement in an SOA record? Defines characteristics of remote name servers Defines characteristics of local name servers Defines characteristics of NIS servers Defines characteristics of NIS+ servers only
9.	What is the main requirement of the zone record? One must be created for each network or subdomain that your DNS server manages . Two must be created for each network or subdomain that your DNS server manages. Three must be created for each network or subdomain that your DNS server manages. Four must be created for each network or subdomain that your DNS server manages.
10.	What is the role of the options statement? Optional parameters for clients Sets key parameters that affect the runtime behavior of the BIND server Sets key parameters that affect the shutdown behavior of the BIND server Sets key parameters that affect the clustering and high availability of the BIND server

Answers

1.	C. Qualified domain names must have a hostname and a domain name.
2.	B. IP addresses must map to hostnames.
3.	A. The named.root file always contains the root name server data.
4.	D. The defaultdomain defines the local domain.
5.	C. The nslookup command can resolve IP addresses and hostnames.
6.	A. The origin, mail addr, serial, refresh, retry, expire, and minimum ttl fields can all be contained within an SOA record.
7.	D. The nslookup command can resolve IP addresses as well as hostnames.
8.	A. The server statement only defines the characteristics of remote name servers.
9.	A . One zone record must be created for each network or subdomain that your DNS server manages.
10.	B. The options statement sets key parameters that affect the runtime behavior of the BIND server.