There are two main types of encapsulation that we'll discuss in the course.
The first one is H Dale deal see more high level data link control.
This is THE LEAD TO encapsulation once again that can be used across a leased line providing layer one
service or connectivity from one site to another.
Now you need to be aware that Cisco have extended the industry stented a version of HDL C by adding
an extra field called the type field.
HDL C is a very simple encapsulation and I'll demonstrate a why shock capture of the frame in a moment.
But as an example we have a flag field address field control field and a frame check sequence field.
So I have added a type field to the frame.
So this is different to the ISO industry standard HPLC protocol.
So it's good devices to use the Cisco HDL C or C HDL C version by default.
And you'll notice it's very easy to set up a serial link using this encapsulation essentially just have
to put an IP address on your rhotic interfaces and no shut the interfaces to get them to communicate
with each other if you want to connect Cisco routers to non Cisco routers.
You're going to want to change it kept isolation to BPP which is an industry standard version of encapsulation.
Now the reason why Cisco added the proprietary field is to allow multiple Hialeah protocols to traverse
the link at the same time.
So in other words if you want to run like provision for an IP version 6 across a serial link simultaneously
the routers need a time field to differentiate the frames that belong to IP version 4 poses the frames
that belong to IP version 6.
When the rodder receives an IP version 4 packet across a serial link.
So in this example Rodda two receives an IP version for packet from Rodda one rodded to needs to know
that that packet should be processed by the IP version 4 protocol stack on the router.
When it receives a IP version 6 packet it needs to know that the packet is destined to the IP version
6 protocol stack and thats what the Topfield provides.
It essentially allows the routers to differentiate between multiple higher layer protocols and hence
Cisco extended the protocol to allow that functionality.
The industry stented version of HGL C doesn't have that type field denoting Hialeah protocols.
It's very simple to configure HDL C between two broad as you would type as an example in Rotto one enable
confetti interface and the role of an interface.
In this example Sariel 1 slash zero you would configure the IP address on the serial interface.
So IP address tend to wander to that one with the mosque 2 4 5 2 5 2 4 5 2 5 2 as an example which would
be better than slushed 24.
And then you specify encapsulation.
HDL C so it's as simple as that to configure HTL see what you type is encapsulation HPLC and that is
done by default for you.
So you don't actually need to configure that at all.