If a company wants us to use their client software to transfer files to them using XML and have given us a destination www.company.com and an IP port 35032 (currently unassigned), can I assume this connection is using the Application layer of the OSI model?
Nearly all applications that a run on workstations use most layers of the OSI model.
The application layer's job is to help the user communicate with the program in use. Part of this layer's job is to find whether there are enough resources to do the job it's asked to as well as identify and establishing the availability of the intended communication partner.
In your case, you have been given a specific client software which transfers files to a specific destination using XML. Certain aspects of this software surely use the application layer, but I wouldn't be able to pin point them simply because I have no programming knowledge of the application in subject.
On the other hand, the connection used to transfer files makes use of other OSI layers. For example, the fact it uses port numbers and IP addresses means that it will require layer 4 (transport layer) and layer 3 (network layer) functions to be utilized.
The bottom line is that most programs perform functions that belong to multiple layers of the osi model and cannot be described as a specific OSI layer program.
If you would like to learn more on the OSI model and how they operate, you can visit www.Firewall.cx and SearchNetworking.com has this OSI Crash Course https://searchnetworking.techtarget.com/resources
Dig Deeper on Network Infrastructure
Related Q&A from Chris Partsenidis
A half-duplex transmission could be considered a one-way street between sender and receiver. Full-duplex, on the other hand, enables two-way traffic ... Continue Reading
SFP ports enable Gigabit switches to connect to a wide variety of fiber and Ethernet cables in order to extend switching functionality throughout the... Continue Reading
A MAC address and an IP address each identify network devices, but they do the job at different levels. Explore the differences between the two and ... Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.