(Part 1.1) Introduction of Operating System | English Tutorial

(Part-1.7) Distributed Operating System (DOS) | DOS vs NOS | English Tutorial

(Part-1.6) Multi-processing Operating System | English Tutorial

(Part-1.5) Multitasking/Time-Sharing Operating System | English Tutorial

(Part-1.4) Multiprogramming Operating System | English Tutorial

(Part-1.3) Batch Processing Operating System | English Tutorial

(Part-1.2) Goals, Functions and Generations of the Operating System | English Tutorial

(Part-1.13) Internet Administration (ISOC, IAB, IETF, and IRTF) | English Tutorial

(Part-1.12) Internet Standards (Maturity Levels & Requirement Levels) | English Tutorial

(Part-1.11) Internet History (Early History, Birth of the Internet and Internet Today) | In English

(Part-1.10) The Internet and Accessing the Internet | English Tutorial

(Part-1.9) Circuit-Switched Network and Packet-Switched Network | English Tutorial

(Part-1.8) Local Area Network VS Wide Area Network |Point-to-Point WAN | Switched WAN | Internetwork

(Part-1.7) Star, Bus, Ring Topology - Advantages, Disadvantages and Use | English Tutorial

(Part-1.6) Mesh Topology - Maths, Advantages, Disadvantages and Practical Example | English Tutorial

(Part-1.5) Types of Connection (Point-to-point and Multipoint) | English Tutorial

(Part-1.4) Networks and Network Criteria | English Tutorial

(Part-1.3) Data Flow (Simplex, Half-Duplex and Full-Duplex) | English Tutorial

(Part-1.2) Components of a Data Communication System and Data Representation | English Tutorial

(Part-1.1) Introduction to Data Communications | English Tutorial