I'm studying about Linux server applications for LPIC 202 exam. I hope I'm going to take the test by the beginning or the middle of June. Because I plan to the 202 exam earlier than 201, I will have to study for and pass the 201 exam also, to take LPIC Level 2 certificate, even after I pass the 202 test.

These days, I have come to know that I haven't fully understood a few important network services which support cyberspace today. For example:

  • When I learn about Domain Name System, I haven't fully understood basic concept of this protocol. I'm confusing the difference of subdomain and host name. It looks like they don't make difference as far as the system's syntax is concerning, but a subdomain stands for a particular host when domain name database has an entry for it.
  • Public keys, frequently used in secure network connections, has two roles, encryption and digital signature. I'm easily confuse one from the other, which make me hard to really understand how a secure connection method works. RSA happens to be used for both encryption and digital signature, but today I just learned that other public key schemes can be used in only either role, e.g. DSA is used for digital signature, but not used for encryption. So I need to make a clear distinction between encryption and digital signature. This will make much easier to understand how you verify a server, how you make an encrypted communication, and assure such a communication is really secure. I also have to look up what message to get CA's sign and how to get verified.
These are hard to understand, especially unless I have a clear direction of what and how to learn.
Fortunately, although I find it pretty hard to learn concepts and configurations, finally in spite of all that toil, I kind of like continue learning.
This is a hope that I can work on behalf of people who find it completely impossible to learn Internet technologies.

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