By Scott Bennett
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An active data connection requires the client to open a port, send the information to the server, and receive a connection from the server. Firewalls often do not allow such incoming connections to internal clients. Therefore, a passive connection is more common because the server opens a port (above 1023) and notifies the client, and then waits for the client to make an outgoing connection. E-mail servers provide a place for users to store, retrieve, and send e-mail. An e-mail client retrieves e-mail from the server and sends e-mail to the server.
Some consider network design an art; I like to call it work. Either way, it is important that you understand the topologies a diagram may present on the CCENT, the protocols and path for data across that diagram, and the function of each hop or component that helps the transmission along. Day 27 looks at what to do when problems occur somewhere along the way. You can further review the topics from today on pages 71–84 and 89–112 of CCNA Flash Cards and Exam Practice Pack (CCENT Exam 640-822 and CCNA Exams 640-816 and 640-802), Third Edition.
Ensure that you can manage and expand your network when choosing the number and type of ports on a router or switch. Consider expansion slots to accommodate future connectivity and port capacity upgrades. ■ A branch office with fewer users may function with a Linksys ISR or similar device, whereas a larger branch office may require a medium-sized business router such as the Cisco 1841 ISR. As network host and traffic needs increase, so does the need for bigger, beefier network devices. Summary You start with pictures and lines representing devices and cables and end up with a fully functional network running protocols and processing code at the speed of light, or at least the speed of electricity.