Transcription of Understanding Layer 2, 3, and 4 Protocols
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Understanding Layer 2, 3, and 4 Protocols
2. Understanding Layer 2, 3, and 4 Protocols While many of the concepts well known to traditional Layer 2 and Layer 3 net- working still hold true in content switching applications, the area introduces new and more complex themes that need to be well understood for any success- ful implementation. Within the discussion of content networking, we will replace terms such as packets and frames with sessions and transactions as we move our attention further up the OSI Seven Layer Model. Before we move into these new terms, however, let's look at some standard Layer 2, 3, and 4 network- ing concepts. The OSI Seven Layer Model What Is a Layer ?
work infrastructure by providing a standard interface to the surrounding layers. The Application Layer (Layer 7) The top layer in the stack, the Application layer is where the end-user applica-tion resides. Think of the Application layer as the browser application or email client for a user surfing the Web or sending email. Many protocols are ...
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