269 lines
4.2 KiB
HTML
269 lines
4.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Exercises</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Introduction to Linux"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Networking"
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HREF="chap_10.html"><LINK
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REL="PREVIOUS"
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TITLE="Summary"
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HREF="sect_10_08.html"><LINK
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REL="NEXT"
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TITLE="Sound and Video"
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HREF="chap_11.html"></HEAD
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><BODY
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CLASS="sect1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Introduction to Linux: </TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sect_10_08.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 10. Networking</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="chap_11.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="sect_10_09"
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></A
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>10.7. Exercises</H1
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="sect_10_09_01"
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></A
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>10.7.1. General networking</H2
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><P
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></P
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><UL
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><LI
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><P
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>Display network information for your workstation: IP address, routes, name servers.</P
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></LI
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><LI
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><P
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>Suppose no DNS is available. What would you do to reach your neighbour's machine without typing the IP address all the time?</P
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></LI
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><LI
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><P
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>How would you permanently store proxy information for a text mode browser such as <B
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CLASS="command"
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>links</B
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>?</P
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></LI
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><LI
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><P
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>Which name servers handle the redhat.com domain?</P
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></LI
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><LI
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><P
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>Send an E-mail to your local account. Try two different ways to send and read it. How can you check that it really arrived?</P
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></LI
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><LI
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><P
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>Does your machine accept anonymous FTP connections? How do you use the <B
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CLASS="command"
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>ncftp</B
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> program to authenticate with your user name and password?</P
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></LI
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><LI
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><P
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>Does your machine run a web server? If not, make it do so. Check the log files!</P
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></LI
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></UL
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="sect_10_09_02"
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></A
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>10.7.2. Remote connections</H2
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><P
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></P
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><UL
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><LI
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><P
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>From your local workstation, display a graphical application, such as <B
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CLASS="command"
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>xclock</B
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> on your neighbour's screen. The necessary accounts will have to be set up. Use a secure connection!</P
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></LI
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><LI
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><P
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>Set up SSH keys so you can connect to your neighbour's machine without having to enter a password.</P
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></LI
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><LI
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><P
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>Make a backup copy of your home directory in <TT
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CLASS="filename"
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>/var/tmp</TT
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> on your neighbour's <SPAN
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CLASS="QUOTE"
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>"backup server,"</SPAN
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> using <B
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CLASS="command"
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>scp</B
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>. Archive and compress before starting the data transfer! Connect to the remote host using <B
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CLASS="command"
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>ssh</B
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>, unpack the backup, and put one file back on the original machine using <B
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CLASS="command"
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>sftp</B
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>.</P
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></LI
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></UL
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="sect_10_09_03"
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></A
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>10.7.3. Security</H2
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><P
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></P
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><UL
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><LI
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><P
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>Make a list of open (listening) ports on your machine.</P
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></LI
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><LI
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><P
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>Supposing you want to run a web server. Which services would you deactivate? How would you do that?</P
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></LI
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><LI
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><P
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>Install available updates.</P
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></LI
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><LI
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><P
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>How can you see who connected to your system?</P
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></LI
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><LI
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><P
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>Make a repetitive job that reminds you to change your password every month, and preferably the <EM
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>root</EM
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> password as well.</P
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></LI
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></UL
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="sect_10_08.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="chap_11.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Summary</TD
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><TD
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WIDTH="34%"
|
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="chap_10.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
|
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ALIGN="right"
|
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VALIGN="top"
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>Sound and Video</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |