Скачать или смотреть Data Link Layer Basics: OSI Model Layer 2

Master the foundation of local delivery with this deep dive into OSI Layer 2! If you don't understand how frames function, your networking knowledge is incomplete.

In this video, we examine the Data Link Layer, the second layer of the seven-layer OSI networking model. Its primary responsibility is local delivery, moving data between two devices that are directly connected at the physical layer. Unlike the Network Layer, which handles end-to-end delivery, Layer 2 handles transmission hop-by-hop.

Key concepts covered in this guide:
• Framing: Learn how the Data Link Layer takes packets and encapsulates them into frames using headers and trailers to provide structure to raw bit streams.
• MAC Addressing: Understand how 48-bit physical addresses are used to deliver frames within a local network segment.
• Data Link Sublayers: We break down the Logical Link Control (LLC), which multiplexes protocols, and the Media Access Control (MAC), which manages medium access and prevents collisions.
• Error Detection: Discover how the Cyclic Redundancy Check (CRC) within the Frame Check Sequence (FCS) ensures data integrity by identifying corrupted bits.
• Flow Control: We explain techniques like Sliding Window and Stop-and-Wait used to regulate transmission speeds and prevent buffer overflow.
• Networking Hardware: See why switches are considered Layer 2 devices that make intelligent forwarding decisions based on hardware address tables.

Whether you are studying for your CCNA or just want to understand how Ethernet and Wi-Fi really work, this lesson provides the authoritative breakdown you need.

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