Mechanisms For Error Detection And Recovery

This section discusses the importance of error detection and recovery mechanisms at the Data Link Layer to ensure data integrity in network communications.

The Imperative For Error Control

This section outlines the importance of error control in the Data Link Layer, detailing the types of transmission errors and the mechanisms for detecting and recovering from these errors.

Detailed Error Detection Techniques

This section discusses various methods used to detect errors in data transmissions, primarily focusing on error-detecting codes such as parity checks, checksums, and cyclic redundancy checks (CRC).

Parity Checks (Simple Parity)

This section explains simple parity checks, a basic error detection technique used in digital communication.

Checksums

Checksums are an error detection method that uses a summation of data segments to ensure data integrity during transmission.

Cyclic Redundancy Check (Crc)

Cyclic Redundancy Check (CRC) is a robust error detection mechanism that enhances data integrity by identifying transmission errors in data frames.

Basic Error Recovery (Link Layer Perspective)

This section outlines mechanisms employed by the Data Link Layer to recover from errors detected during data transmission, focusing on Automatic Repeat Request (ARQ) and Forward Error Correction (FEC).

Automatic Repeat Request (Arq)

Automatic Repeat Request (ARQ) is a fundamental mechanism for error recovery at the Data Link Layer, utilizing acknowledgments and timeouts to ensure reliable data transfer.

Forward Error Correction (Fec)

Forward Error Correction (FEC) is a method that allows the receiver to correct certain types of errors in transmitted data without needing retransmission.

Medium Access Control (Mac) Protocols

This section covers Medium Access Control (MAC) protocols, which are responsible for coordinating access to shared transmission media to prevent collisions.

The Core Problem: The Multiple Access Channel

This section delves into the challenges faced by broadcast networks in managing the shared communication channel, focusing on collision avoidance and throughput maximization.

Classification Of Mac Protocols

MAC protocols are classified into channel partitioning, random access, and taking-turns protocols to manage access to shared communication channels.

Channel Partitioning Protocols

Channel partitioning protocols are methods for managing access to a shared communication medium by dividing it into non-overlapping segments, ensuring that multiple users can transmit data without collisions.

Random Access Protocols (Contention-Based Protocols)

Random access protocols, or contention-based protocols, allow multiple stations to share a communication channel by transmitting data whenever they have it, addressing potential collisions through defined rules for retransmission.

Taking-Turns Protocols

Switched Lans: Ethernet And Local Area Network Operations

This section discusses the evolution from traditional hub-based networks to modern switched Ethernet LANs, highlighting their operational principles, MAC addressing, and frame structure.

Evolution To Switched Lans: From Hubs To Dedicated Links

This section explains the transition from hub-based Ethernet networks to switched Ethernet LANs, detailing the advantages of switching technology in eliminating collisions and enabling full-duplex communication.

L2 Addressing (Mac Addresses) And Arp

This section explains the importance of Layer 2 (MAC) addressing and the Address Resolution Protocol (ARP) in local area networks.

Mac Address (Media Access Control Address): The Hardware Identifier

This section explains the concept of MAC addresses as unique identifiers for network interfaces, outlining their structure and significance in local area networking.

Arp (Address Resolution Protocol): Bridging Layer 2 And Layer 3

The Address Resolution Protocol (ARP) facilitates communication on a Local Area Network (LAN) by mapping IP addresses to MAC addresses.

Ethernet Frame Structure (Ieee 802.3): The Data Link Unit

This section discusses the structure of an Ethernet frame defined by IEEE 802.3, outlining its key fields and their significance for data transmission over a local area network.

Learning Switches (Ethernet Switches): The Intelligent Connectors

This section explores the functionalities of learning switches in modern LANs, emphasizing their role in creating dedicated, collision-free communication segments.

Module 7 Assessment Opportunities

This section provides a series of assessment opportunities that cover critical concepts of the Data Link Layer, focusing on error detection, MAC protocols, Ethernet communication, and switch operations.