Day 8 | TRE 4.0 Computer Science | OSI Model | Physical Layer | Data Link Layer | By Manish Kumar

📌 Welcome to Day 8 of the TRE 4.0 Computer Science Vacancy Preparation Series!

In this session, we cover one of the most important, conceptual and repeatedly asked topics from Computer Network —

OSI Model (Open System Interconnection Model) – Layer-wise Explanation

This topic is highly scoring and frequently asked in TRE 4.0, CTET, STET, KVS, DSSSB and other Computer Teacher Exams.

📚 Topics Covered in This Class:

🔹 Introduction to OSI Model

Full Form of OSI

Also Known As (Reference Model, Logical Model, Conceptual Model)

Proposed Year & ISO Publication

Purpose of OSI Model

7 Layer Architecture Concept

🔹 Layers of OSI Model

Application Layer

Presentation Layer

Session Layer

Transport Layer

Network Layer

Data Link Layer

Physical Layer

Mnemonic Trick for Remembering Layers

🔹 Layer Classification

Host to Host Layers

Network Access / Media Layers

Software (User Supported) Layers

Hardware (Network Supported) Layers

Transport Layer as Heart of OSI Model

🔹 Data Flow in OSI Model

Data / Message

Segments / Datagrams

Packets

Frames

Bits

🔹 Physical Layer (Layer-1)

Bit Transmission

Transmission Media (Wired / Wireless)

Transmission Modes (Simplex, Half Duplex, Full Duplex)

Devices & Protocols

Limitations of Physical Layer

🔹 Data Link Layer (Layer-2)

Frame Formation

MAC Address / Physical Address

Unicast, Multicast & Broadcast

Error Control & Flow Control

Header & Trailer Concept

Ethernet Frame Size

Limitations of Layer-2

Protocols of Data Link Layer (ARP, PPP, HDLC, LACP, etc.)
🎯 This Class is Useful For:

✔ TRE 4.0 Computer Science
✔ CTET / STET
✔ DSSSB / KVS / NVS
✔ Computer Teacher Exams
✔ All Competitive Exams (CS / IT)

👉 Watch till the end for complete clarity, exam-oriented notes and MCQ-based concepts.
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