ISO OSI AND TCP/IP
NETWORKING MODELS
CHAPTER 1
1
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Example of a Computer Network
2
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What is a Computer network?37
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The Internet Layer
At the Internet layer, the logical addresses of the source and
destination devices are determined and placed on the package.It extracts the IP packet from this frame and resolves the
information in the IP header, then does the same for the
TCP and application headers, eventually extracting the
HTTP application data for processing by a software
program, such as a web browser or web server.o Network adapter or network interface card (NICs)--An NIC joins an end
system host to network media (cabling or wireless) and enables it to
communicate over the network by assembling and disassembling frames.3
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ISO
The International Organization for Standardization (ISO)
developed the Open Systems Interconnection (OSI)
reference model (iso.org/standard/20269.html) to
promote understanding of how components in a network
system work.18
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Communication at layer 2 of the OSI model
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