Bsc CSIT Semester 4 – Computer Networks – Unit 3: Data Link Layer (8Hrs.)

Flow Control and Stop-and-Wait ARQ Protocol --- 1. Flow Control Definition: Flow control is a technique used in data communication to regulate the rate of data transmission between a sender and re

Logical Link Control (LLC) and HDLC 1. Logical Link Control (LLC) Definition: LLC is a sublayer of the Data Link Layer (Layer 2) in the OSI model that provides logical addressing and control funct

Flow Control and Stop-and-Wait ARQ Protocol --- 1. Flow Control Definition: Flow control is a technique used in data communication to regulate the rate of data transmission between a sender and re

Error Detection vs Error Correction & CRC --- 1. Difference Between Error Detection and Error Correction | Feature | Error Detection | Error Correction | |---------|----------------|-----------------

Short Notes (Any Two) --- a. Protocol and Standards A protocol is a set of rules that govern how data is communicated between devices in a network. It ensures that devices from different manufactur

Flow Control Definition: Flow control is a technique used in data communication to ensure that the sender does not overwhelm the receiver by sending data faster than it can be processed. It prevents

CSMA/CD (Carrier Sense Multiple Access with Collision Detection) Definition: CSMA/CD is a network protocol used in Ethernet to control access to the shared communication medium. It helps devices avo

Flow Control and Go-Back-N ARQ Flow Control Flow control is a technique used in data communication to prevent the sender from overwhelming the receiver with too much data at a time. It ensures that t

Short Notes a. Connection-Oriented Service - In this service, a dedicated path is established between sender and receiver before data transfer. - Ensures reliable delivery with sequencing, error c

Introduction The Data Link Layer (DLL) is the second layer of the OSI model and is responsible for reliable transfer of data across a single network link. It acts as an interface between the physica

Introduction Point-to-Point Protocol (PPP) is a data link layer protocol used to establish a direct connection between two nodes over serial links like telephone lines, fiber optics, or leased lines.

| Feature | ALOHA | Slotted ALOHA | |---------|-------|----------------| | Time Division | No time slots; stations transmit whenever they have data | Divides time into discrete slots; transmission sta

Connection-Oriented Service A connection-oriented service is a type of communication where a logical connection is established between the sender and receiver before data transmission begins. It ens

Introduction In data communication, errors may occur due to noise, interference, or signal distortion during transmission. After detecting an error, the system must take steps to correct it to ensur

CRC Calculation Given Data: - Message bits (M) = 1101011011 - Generator polynomial (G) = 10011 → Degree of G = 4 (since there are 5 bits) --- Step 1: Append zeros to the message Append 4 zeros

Media Access Control (MAC) Sublayer Media Access Control (MAC) is a sub-layer of the Data Link Layer in the OSI model. It controls how devices access the shared communication medium (like cables or

PPP (Point-to-Point Protocol) is a Data Link Layer protocol used to establish a direct connection between two nodes over a serial link, such as a telephone line, fiber link, or modem connection. It