Transcription of Understanding Layer 2, 3, and 4 Protocols - pearsoncmg.com
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Understanding Layer 2, 3, and 4 Protocols - pearsoncmg.com
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 ?
The Session layer is used by applications at either end of the communication between end devices to tie together multiple Trans-port layer sessions and provide synchronization between them. The HTTP protocol can use multiple TCP connections to retrieve objects that make up a single Web page. The Session layer provides application coordi-
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