- [Instructor] The DOD model
was created before the OSI model.
In this graphic it shows the different
various applications and protocols that they
included in the protocol sweep.
Let's talk about a few of them.
Telnet stands for Telephone Network.
It's used to make your terminal run as
a dumb terminal and run programs on another device.
Secure Shell or SSH is the same thing, however,
it's encrypted where Telnet is in clear text.
File Transfer Protocol allows us to send
and receive files in a reliable fashion because it uses TCP.
TFTP uses UDP but it's still connection oriented,
although most people don't know this.
It is a connection-oriented protocol
at the application layer.
SNMP Simple Network Management Protocols allow us
to monitor our network.
Use something called a Network Management Station
to gather information about network hosts.
HTTP and HTTPS Hypertext Transfer Protocol
allows us to view web pages.
NTP Network Time Protocol allows us to keep the time
synchronized through out our network.
DNS, a very important application, allows us
to resolve human names to IP addresses.
If we didn't have DNS, every time we used HTTP to a site,
then we'd have to type in the IP address.
We'd have to know every IP address on the Internet.
DHCP allows us to receive IP information on a host.
We don't need this with IP version 6,
but in this case here it was called BOOTP
and now DHCP or Dynamic Host Configuration Protocol
runs on top of BOOTP.
Now APIPA Automatic Private IP Addressing was
created by Microsoft to give us
what's called a link local address.
And what this does is on a Windows device,
if it comes up and can't get a DHCP address
and no address is assigned statically
then it's gonna assign itself a 169254 address and that's
considered a link local and that's owned by Microsoft.
Alright, these are just some of the protocols and
applications covered at the application process layer.