The Internet Band Protocols

In the DoD model, there are two capital affidavit for the Internet layer’s existence: acquisition and

providing a distinct arrangement interface to the high layers.

None of the added upper- or lower-layer protocols accept any functions apropos to routing—

that circuitous and important assignment belongs absolutely to the Internet layer. The Internet layer’s second

duty is to accommodate a distinct arrangement interface to the upper-layer protocols. Without this

layer, appliance programmers would charge to address “hooks” into every one of their applications

for anniversary altered Arrangement Access protocol. This would not alone be a affliction in the neck,

but it would advance to altered versions of anniversary application—one for Ethernet, addition one for

Token Ring, and so on. To anticipate this, IP provides one distinct arrangement interface for the upperlayer

protocols. That accomplished, it’s again the job of IP and the assorted Arrangement Access

protocols to get forth and assignment together.

All arrangement anchorage don’t advance to Rome—they advance to IP. And all the added protocols at this

layer, as able-bodied as all those at the high layers, use it. Never balloon that. All paths through the

DoD archetypal go through IP. The afterward sections call the protocols at the Internet layer:

If you enjoyed this post Subscribe to our feed

cisco ccna study