Addis course Tasks & Skills questions

• What does the command find /etc | less do?

• What does the command ps aux do?

• What does the command mii-tool do and when would you use it?

• What does the command host www.google.com do?

• How do you get the MAC address of your computer?

• What can you use dnsmasq for?

• What is in /etc/dnsmasq.conf?

• What is the use of the dhcp-option configuration parameter of /etc/dnsmasq.conf?

• What is the difference between chown, chgrp and chmod?

• What would you use nmap for?

• How do you check to see if a network service is running on your computer?

• What does apache2ctl configtest do? When should you run it?

• Consider this piece of configuration of apache:

  AuthUserFile /etc/apache2/students
  AuthType Basic
  AuthName "Students"
  Require valid-user
  

What does it do?

What command would you use to add a new username and password to /etc/apache2/students? (you can write the entire commandline if you know it, but just the name of the command is fine)

• You created the configuration for a new apache site in /etc/apache2/sites-available. How do you activate the new site?

• When do you need to add the line Listen 443 to /etc/apache2/ports.conf?

• What do you normally find in /var/log/syslog, and when would you read it?

• What does the command smbclient //localhost/web do?

• What does the command sudo smbpasswd -a enrico do?

• Where do you look for the explanation of the many directives found in /etc/samba/smb.conf?

• What is the purpose of the package cupsys?

• What is the purpose of the command iptables?

• What is the difference between MDA, MTA and MUA?

• In a normal mail server configuration, when should you accept a mail coming from outside your local network?

• Suppose you are a mail software and you need to send a mail to addis@yahoo.com: how do you find out the internet host to which you should connect to send the mail?

• What is the difference between man 5 postconf and man 8 postconf?

• What is the different use of SMTP and IMAP?

• What is a "smarthost" in the context of mail server configuration?

• What does the command mailq do?

• What does the command sudo postsuper -d ALL deferred do?

• Postfix has four mail queues: "incoming", "active", "deferred" and "hold". What is the difference among them?

• What does the package dovecot do?

• In the file /etc/dovecot/dovecot.conf, what is the difference between having protocols = imap and protocols = imaps?

• What happens if I put the line enrico@enricozini.org in the file /home/enrico/.forward?

• Consider this list of possible strategies for handling mail classified as spam:

  • silently delete it
  • refuse the mail and send a notification to the sender
  • refuse the mail and send a notification to the receiver
  • quarantine the e-mail
  • refuse delivery with a SMTP error
  • deliver with an extra header that says that it's spam

What are their advantages and disadvantages?