Siksha Sarovar

Siksha Sarovar (sikshasarovar.com) is a free educational web application that helps students in India learn programming and prepare for academic and competitive exams. The platform offers structured coding courses (C, C++, Python, Java, HTML, CSS, PHP, Power BI, AI, Machine Learning, Data Science), complete university curriculum notes for BCA/MCA students with previous year question papers, Class 10 and Class 12 CBSE/HBSE school notes, and dedicated preparation material for SSC, UPSC, Banking, Railway and other government exams. Browsing the site is completely free and requires no account. Users may optionally sign in with Google solely to save their learning progress, quiz scores and personal preferences across devices.

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Siksha Sarovar is a free e-learning platform for coding courses, BCA university notes and competitive exam preparation. Optional Google sign-in saves your learning progress across devices.

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Free Computer Networks Notes for BCA & BTech 2026 — OSI to TCP/IP

Computer Networks is a core subject in every BCA, MCA, and BTech CSE/IT curriculum in India — and it is also one of the most commonly asked subjects in campus placements, GATE, and government IT exams. Whether you are preparing for semester exams at YMCA Faridabad, IPU, or AKTU, or targeting a networking or backend developer role, these free notes cover the full CN syllabus.

Topics covered in the Computer Networks notes

  • OSI Model: all 7 layers with functions, protocols at each layer, common exam questions on layer identification.
  • TCP/IP Model: comparison with OSI, Internet layer, transport layer (TCP vs UDP), application layer protocols.
  • Data Link Layer: framing, error detection (CRC, Hamming), flow control (stop-and-wait, sliding window), MAC protocols (CSMA/CD, CSMA/CA).
  • Network Layer: IP addressing (IPv4, IPv6, subnetting, CIDR), routing algorithms (Dijkstra, Bellman-Ford), routing protocols (RIP, OSPF, BGP).
  • Transport Layer: TCP 3-way handshake, congestion control, UDP, socket programming basics.
  • Application Layer: HTTP/HTTPS, DNS, DHCP, FTP, SMTP, POP3/IMAP.
  • Network Security: symmetric and asymmetric encryption, SSL/TLS, firewalls, VPN basics.

Why CN matters for placements

Backend development, cloud computing, DevOps, and network engineering roles all require strong CN fundamentals. Interviewers at product companies routinely ask about TCP vs UDP, the 3-way handshake, DNS resolution, and HTTP methods. Pair CN knowledge with COA (Computer Organisation) for a stronger technical interview foundation.

Practice and code along

Socket programming examples in Python and Java are included in the course. Run them in the online compiler to see how client-server communication works in practice. The AI Tutor can explain confusing protocol details in plain language.

Open the free Computer Networks notesand start with the OSI model — it is the foundation all other CN topics build on.