OSI Model
Networking Layers Understanding Networking Layers Layer 1: Physical Layer Metaphor: The Roads Role: Provides the physical path (like roads or pathways) for the delivery vans to travel. Layer 2: Data Link Layer Metaphor: Local Delivery Van Role: Like a local delivery van that carries the message within the sender's town using the local routes (using MAC addresses). Layer 3: Network Layer Metaphor: Long-Distance Courier System Role: Determines the overall best path (using IP addresses) to get the message from the sender’s town to the recipient’s town, like a long-distance courier system. Layer 4: Transport Layer Metaphor: Message Integrity Checker Role: Ensures all the parts of the message arrive intact and in order, l