We live our lives in Internet era - it's a fact. Shopping, payments and money management are all subjects of online transactions too. Consequently it is necessary to ensure the safety of online transactions. That's what SSL protocol does. SSL is the main topic discussed in this micro course. Additionally, the course shows an example of configuring Stunnel package, which is used to secure any communictaion service with an encrypted SSL channel.
Web services works in a client-server mode. A client is often the user's computer communicating with a server over the network. Often, the client also has a built-in functions of the server. The course presents concepts of the client system, the servers themselves (blade servers), and some of the server services (application layer services – L7).
Everyone, when crowling the Internet, develops his own methods of search interesting resources. Public Web search engines give invaluable service. Of course the quality of the results obtained is directly proportional to the knowledge of the user about their use. Therefore, you should be thoroughly familiar with the principles of creating advanced queries, at least for a few major search engines. This allows more efficient (faster) serach process. If you want to find out what ErrorMessage means all you have to do is just to copy it and paste it into a search engine. Of course, this „message” should be included in quotation marks. If someone has had a similar problem, the Internet will most likely keep his message and a description of the problem. If thre is the answer to his post (posted on one of the public newsgroups) you can also read it. In this part of the course we will present the resources on the Internet, from where you should start searchig, and you should know. Of course, there will be just few od them, other interesting network addresses can be found in the course content. We also present here the methods for converting numbers from decimal system to binary and hexadecimal systems. It is a very valuable skill needed later by administrators in a situation of dealing with MAC, IPv4 and IPv6 addresses. We strongly encourage you to exercise! How to measure „speed” of network? Find the answer here.
The importance of the DNS server is known to every person using its resources such as electronic mail or WWW. The micro-course discusses the way of installing and configuring the ISC BIND server, the way of creating zones and entries in the base for particular domain records.
Keywords: BIND, named, named.conf, zone
The micro-course describes the most popular server of HTTP which is the free Apache server. It shows the history of the system, the architecture of the server work, and the way to install it. The micro-course is necessary if you want to implement the WWW server.
Keywords: apache, httpd, httpd.conf
The micro-course describes the way of creating the DEB packet. The simplest method is creating manually all necessary files making the packet and using the dpkg-deb command. This method of creating a packet requires making according structure files. To automate these tasks you can use the debhelper and the dh_make. In this micro-course you can find example procedures used for this purpose.
The micro-course contains a description of the FreeRadius system, its installation and configuration. It is the most popular free RADIUS server in the Linux system used in many implementations of IT systems for computer networks.
Keywords: freeradius, huntgroups, radiusd.conf, clients.conf, radiusd
Issues addressed in this micro-course, allow the Administrator to build knowledge of how to log into the system via the remote console. Administrator willractically learn how to use Putty, Telnet or SSH programs to get to the system. Finally the Administrator wii find out how to display information about users in the network.
Every Internet user knows how important electronic mail is. The role of the administrator is securing the mail server against possible attacks. This micro-course describes the basics of installation, configuration and managing the Qmail electronic mail server. The server was created as a safe alternative to the SMTP Sendmail server.
Keywords: qmail, smtp, /var/qmail/alias, alias, /var/qmail/control