In this video, we'll show you the traditional OSI 7 Layer

Network Model and describe how the TCP/IP family of IoT

protocols fit into the picture.

The internet of things is introducing many new network

protocols.

Sometimes there are so many that it's

difficult to know how and when they can be used.

In addition, protocols that are not

based on the traditional OSI 7 Layer Model

are becoming more common, where they have advantages

in IoT situations such as systems

that require low power, long distance radio communications,

or mesh networking.

The physical layer, Layer 1, is responsible

for the transmission of digital data bits

from the physical layer of the sending

device to the physical layer of the receiving device.

Examples of Layer 1 technologies include ethernet cables,

token ring networks, hubs, and repeaters.

The data link layer, Layer 2, is responsible for transferring

data between two adjacent network nodes

and providing some error correction.

Examples of data link protocols are

the frame based Ethernet Protocol and the Point-to-Point

Protocol, or PPP.

The network layer, Layer 3, is responsible for providing

the ability to transfer variable length and network packets

from a source to a destination.

This includes the ability to route

between adjacent networks.

Examples of protocols in this layer

are IPv4 and v6, IPSec, the Internet Control Message

Protocol, or ICMP, which enables traceroute and ping,

and the Internet Group Management Protocol,

which enables multicast groups.

Layer 4 is the transport layer and it

provides services such as the connection-oriented data stream

protocol, reliability.

flow control, and multiplexing.

Most people will better know this layer as the TCP or UDP

service layer.

The next commonly used network layer

is the application layer, or Layer 7,

which provides an abstraction layer that specifies

higher level protocols.

Some of these include the classic internet protocols

such as HTTP, FTP, MQTT, SMTP, IMAP, LDAP, DNS, SSH,

TLS, and more.

The OSI 7 Layer Model gives us a conceptual framework,

which we can use to continue our exploration of how

specific protocols fit into the internet of things.

Thanks for watching.

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