Cookie policy: This site uses cookies (small files stored on your computer) to simplify and improve your experience of this website. Cookies are small text files stored on the device you are using to access this website. For more information on how we use and manage cookies please take a look at our privacy and cookie policies. Some parts of the site may not work properly if you choose not to accept cookies.
The root cause of application anomalies don’t stop at Layer 3 of the Open Systems Interconnection (OSI) model. In fact, some of the most difficult to diagnose service issues are rooted in, or manifest themselves at the Transport Layer (Layer 4) or higher.
Since the Transport layer is responsible for building and maintaining sessions between devices, it serves to connect the lower layers (1-3) to the higher layers (5-7). It can also be the point of referred pain, when the real source of the problem lies elsewhere.
A methodical process to resolving service issues that reside at Layers 4-7 can clear up ambiguities and accelerate problem resolution. Mike Motta, NI University instructor and troubleshooting expert, and Tony Fortunato Senior Network Performance Specialist and Instructor with the Technology Firm, place typical user complaints into three categories:
Slow Network
Inability to Access Network Resources
Application-Specific Issue
In this two-part white paper series, learn to quickly locate and resolve problems across the OSI layers using the Troubleshooting Cheat Sheet.
