We are living in an age where time is essential. Most people feel like they don’t have time to do anything besides the tasks they have at work and some of the home everyday household chores. This means that investing time and money in conventional computer courses is not an option for many people. However, this doesn’t mean that you should accept this and that you can’t do anything to improve your knowledge and obtain some skills. On the contrary, thanks to modern technology you can now download free computer courses and tutorials in PDF files. These PDF files also contain exercises, examples of practical work and other things that will make the learning process easier and simpler.

All it takes is a computer, access to the Internet and of course – patience and willpower. Luckily, more and more people are willing to share their experience and knowledge with others and they don’t want any compensation for this. Courses and tutorials are completely free and the authors doesn’t want any compensation.

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As previously mentioned, you can do some research and find other attractive PDF tutorials too. Quake 1 Android Apk Download. Driver Hp Vivera Inks Windows 7 on this page. Computer PDF is here to help you learn programs, enhance your knowledge in computer security, databases, office, automation, analytics and IT in general. Feel free to download our IT tutorials and guide documents and learn the joy of free learning.

Layers of OSI Model Application Layer Application layer यूज़र की एप्लीकेशन और नेटवर्क के बीच इंटरफ़ेस प्रोवाइड करती है। जैसे की एक वेब ब्राउज़र (Internet explorer, Mozilla fire-fox, chrome) या कोई ईमेल क्लाइंट (Outlook, Thunderbird). ये सभी applications आपको network पर काम करने के लिए इंटरफ़ेस provide करती है। यूज़र की application एप्लीकेशन लेयर में नहीं होती है बल्कि protocol होता है जो यूज़र के operations को control करता है। यूज़र एप्लीकेशन से interact करता है और application network से interact करती है। जैसे की कोई web address open करना। Application layer पर बहुत से protocol यूज़ किये जाते है जिनमे से कुछ निचे दिए जा रहे है। • HTTP (Hyper text transfer protocol) • FTP (File Transfer Protocol) • POP 3 (Post Office Protocol) • SMTP (Simple mail transfer protocol) • Telnet.