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Computer Networking: Difference between revisions
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The physical layer | The physical layer is comprised of the literal copper, fiber, and wireless frequencies used to transport bits, 0s and 1s.<br> | ||
The data link layer focuses on transmitting data frames between directly connected nodes. Medium access control (MAC) and logical link control (LLC) work at this layer.<br> | |||
The network layer allows packets to flow between nodes which are not directly connected. Routing with IPs between networks happens at this layer.<br> | |||
The transport layer focuses on levels of reliability. TCP and UDP are used at this layer.<br> | |||
The session layer focuses on connections.<br> | |||
The presentation layer focuses on standardizing protocols and data representations (e.g. XML).<bR> | |||
Finally, the application layer is what highest-level, whatever service is being provided to the user. | |||
==TCP/IP== | |||
{{main | Wikipedia: Internet protocol suite}} | |||
TCP/IP has five layers: | |||
<ol style="transform: rotate(180deg);"> | |||
<li style="transform: rotate(-180deg);">Link layer</li> | |||
<li style="transform: rotate(-180deg);">Internet layer</li> | |||
<li style="transform: rotate(-180deg);">Transport layer</li> | |||
<li style="transform: rotate(-180deg);">Application layer</li> | |||
</ol> | |||
==Routing== | |||
===Distance Vector=== | |||
In Distance Vector routing, or Bell-ford Algorithm, each node incrementally builds up it's own routing table to identify the next hop to reach each destination. | |||
==Networking Hardware== | ==Networking Hardware== | ||