Save valuable study time and ease your brain strain with these timely tips on preparing for your MCSE certification exams. For the certification test, remember that X.25 is a packet-switching network that uses circuits, switches, and routes to provide the best connection between two points at any given time. The routes change as conditions in the network change, so it is common for data packets to take multiple routes through the network during a communications session. Consequently, an X.25 network is pictured as a cloud.
Data goes in, and data comes out.
What happens in between is a mystery. DLC is a commonly used choice on the exam for answers about protocols. If you get a question about using DLC, remember that it is not a full protocol suite and therefore cannot be used to do many normal networking functions, such as file transfers between servers and network computers. For this reason, DLC is not commonly used with network PCs. Tips Tips, such as these from the book, offer chunks of advice that you can use even after you've taken the exam.