In this hands-on project, you examine the services running on your local computer using the nmap utility and /etc/services file.
1. Switch to a command-line terminal (tty2) by pressing Ctrl+Alt+F2 and log in to the terminal using the user name of root and the password of secret.
2. At the command prompt, type service httpd stop and press Enter.
3. At the command prompt, type service xinetd stop and press Enter.
4. At the command prompt, type nmap –sT 127.0.0.1 and press Enter. What ports are listed that you recognize? Are there any unknown ports? Where could you find information regarding the unknown ports? What is the service associated with port 631/tcp?
5. At the command prompt, type grep 631 /etc/services and press Enter. What is the full name for the service running on port 631?
6. At the command prompt, type service httpd start and press Enter.
7. At the command prompt, type service xinetd start and press Enter.
8. At the command prompt, type nmap –sT 127.0.0.1 and press Enter. What additional ports were opened by the Apache Web server and Internet Super Daemon?
9. Type exit and press Enter to log out of your shell.
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