Chapter 9

1.	What do LAN, WAN, TCP/IP, PPP, and ISDN stand for?
2.	Determine a Public Class C IP address and specify it with netmask .
3.	Determine various IP ranges available to be used as Private IP addresses for your LAN.
4.	Write down the steps to change the Apache 2 Web server port number from 80 to 81, on which Apache will listen for incoming requests .
5.	Check the Apache Web server configuration file ( httpd.conf ) for syntax errors.
6.	Restart the Apache Web server without affecting any connected clients .
7.	Using the RPM command-line interface, determine the FTP server currently installed on your system.
8.	Change the FTP greeting banner on your vsftpd server and test it.
9.	Check the print queue using the command line utilities.
10.	Check the Samba configuration file ( /etc/samba/smb.conf ) for correctness.
11.	Check the mail queue on your Mail server.
12.	What is the location of the DHCP server configuration file?

Answers

1.	These abbreviations stand for the following: LAN: Local Area Network WAN: Wide Area Network TCP/IP: Transmission Control Protocol / Internet Protocol PPP: Point-to-Point Protocol ISDN: Integrated Services Digital Network
2.	192.168.1.10 with a netmask of 255.255.255.0 is a Public Class C IP address.
3.	Following are the Private IP ranges available to be used in your LAN: 10.0.0.0 “10.255.255.255 172.16.0.0 “172.31.255.255 192.168.0.0 “192.168.255.255
4.	Following are the steps to change the Apache port number to listen for inkling requests: a. Open the /etc/httpd/conf/httpd.conf file in your preferred editor. b. Search for the following configuration line: Listen 80 c. Change this line to the following: Listen 81 d. Save the file. e. the Apache Web Server using the service command as follows : service http restart
5.	To check the httpd.conf configuration file for syntax errors, use the following command: service httpd configtest .
6.	To restart the Apache Web Server without affecting any connected client and without any downtime on the Web site hosted on Apache Web Server, use the following command: service httpd graceful . The graceful option restarts the Apache httpd daemon without aborting currently open connections.
7.	You can find out any RPM package installed on your system by using the following command: rpm -qi vsftpd . If you can t remember the exact name of the package, you can also search for a package using the following command to display the list of packages installed on your system with ftp in their package names : rpm -qagrep ftp . Once you learn the name of the package, you can get more information about that package using the rpm -qi [ package name ] command.
8.	To change the ftp banner on your vsftpd server, follow these steps: a. Open the vsftpd configuration file /etc/vsftpd/vsftpd.conf in your preferred text editor. b. Find the following configuration directive: #ftpd_banner=Welcome to blah FTP service . c. Uncomment and change the preceding configuration directive to look something like the following: ftpd_banner=Welcome to the Wrox Press FTP service . d. Save the configuration file and restart the vsftpd service as follows: service vsftpd restart .
9.	You can check the print queue on the print server using the lpq command line utility as follows: lpq -a .
10.	The SAMBA package comes with a command line utility called testparm to check the SAMBA configuration file. Execute the command on the command line to check the /etc./samba/smb.conf file as follows: testparm .
11.	Execute the mailq command on the command line as follows: mailq .
12.	The location of the DHCP configuration file is /etc/dhcpd.conf .