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Layer 2 Encapsulation Protocols

High-Level Data Link Control (HDLC) - HDLC is the default encapsulation type on point-to-point, dedicated links, and circuit-switched connections. It is used typically when communicating between two Cisco devices. It is a bit-oriented synchronous data link layer protocol.

Seven Layers of the OSI Model

Various mnemonics have been created over the years to help remember the order. Probably the most taught and text-book found ones are:


Routing is the process by which an item gets from one location to another. Many items get routed: for example, mail, telephone calls, and trains. In networking, a router is the device used to route traffic. The routing information a router learns from its routing sources is placed in its routing table. The router will rely on this table to tell it which port to use when forwarding addressed packets

Open Systems Interconnection(OSI) Model

The Open Systems Interconnection (OSI) model began as a reference model, but has since been implemented. It was created by the International Organization for Standardization (ISO) to provide a logical framework for how data communication processes should interact across networks. Standards were created for the computer industry allowing different networks to work together efficiently.

IOS Location Process

The sequence of events the bootstrap code follows to find the image follows:

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