What is the Network Layer?

The Network Layer is layer three of the OSI model.

The Network Layer resides above the Data Link Layer and below the Transport Layer.

The Network Layer is responsible for establishing paths for data transfer through the network.

The Network Layer extends the Data Link Layer beyond the local network into an internetwork by providing for routing and forwarding of packets.

The Network Layer is also responsible for packet sequencing, congestion control, and error handling.

Routers operate at the Network Layer.

Network Layer Standards

Standards which operate at the Network Layer include: IP and ICMP.

Books on the OSI Model

OSI Reference Model Pocket Guide

The pocket-sized reference provides the help you need to effectively prepare for the OSI related questions you'll encounter on Cisco's CCNA certification exam. It also serves as a practical tutorial explaining the confusing layered architecture of modern network design. The Open Systems Interconnection (OSI) Reference Model is the basis for much of modern networking. It is a layered model under which all networking protocols and services are defined. Many attempts at explaining OSI become too abstract and require a very high level of network design knowledge and experience to even begin to understand. This pocket guide presents a more practical, user-friendly examination of the topic. The author, Howard Berkowitz, CCSI, is an accomplished network designer and instructor who has written two books on network architecture. He effectively utilizes real-life experiences, analogies, and humor to clear up some of the most common confusions and misconceptions associated with the OSI Reference. Sample questions (with correct answers and complete explanations), similar to those found on Cisco's certification exams are included in this reference. These questions (with correct answers and complete explanations) allow readers to test their OSI knowledge level before attempting the actual tests.

OSI Reference Model for Telecommunications

The OSI (Open System Interconnection) Reference Model is a cornerstone of modern network design. Although the OSI model has become almost synonymous with data communications, it serves the public switched telephone network (PSTN) as well and is a productive way to organize and teach the building blocks of telecom systems. In OSI Reference Model for Telecommunications, hands-on expert Debbra Wetteroth provides telecom staffers the information they need to gain a working knowledge of this essential telecom service architecture and equipment. Her style that breaks down the barriers between data and voice vocabularies. This quick reference to the OSI model puts the data you need everyday at your fingertips.