The document discusses using models to describe complex systems by breaking them down into their fundamental components and interactions. It provides an example of using the OSI model to describe how email works. Specifically: - The physical layer represents the transmission medium that allows an email message to be sent. - The data link layer handles how the data picks a transmission path and is converted for the receiving end. - The network layer uses IP addresses to determine the source and destination of an email. - The transport layer breaks the email down into segments for transmission and reassembles it. - The session layer adds a header to mark the start and end of an email. - The presentation layer converts the information

1. question 1:
"OSI Model"
Please respond to the following:
The OSI model has stood the test of time. It’s used to describe
the functionality of various networking appliances and the
logical protocols that interact on the physical media. Modeling
is important because it provides a way for experts to talk about
what’s happening in the abstract. Think about something you
use every day that you could describe using a model. For
example, a bicycle. What are the common parts shared by all the
different kinds of bikes? How can you use the parts to describe
the differences between the operation of one bike and another?
Enjoy this discussion topic and apply what you are learning this
week to your model.
class mates discussion: (Comment )
OSI Model is a great way to break down network appliances and
how they operate. One item I use daily and would like to dissect
is email. We all use email daily but when broken down using
OSI it becomes interesting. Here is my interpretation using the
OSI Model:
The Physical Layer would be the medium used to put the
message together and allows it to be sent to the receiver. It
converts the data and sends it to the next layer.
In terms of sending and receiving an email, the Data Link works
two different ways. If I send an email, on one end data picks a
way the message will be sent and on the receiving end data link
converts the message and allows it to be sent and seen.
The Network Layer with an email works by using an IP address
and determines the source and destination.
Transport Layer where the email is broken down into segments
and reassembled by the transport level.
Session Layer A header is added to assist with the start and
ending of my email.
Presentation Layer is responsible for converting info for my
network and also responsible for encryption inside of my email

2. and on my network.
Finally the Application Layer is the client I use or my email
host.