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.
Once this application information has been generated, it can be packaged and passed on to the next layer for transport. HTTP requires a connection-oriented Transport layer protocol to guarantee the delivery of each packet in the session. Transmission Control Protocol (TCP) is used in HTTP applications to ensure this successful packet delivery.
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