By Todd Lammle
This can be an analogous e-book Strayer used for CIS 339 in spring of 2009. shop your fifty dollars and decide this one up affordable on-line.
Read Online or Download CCDA: Cisco Certified Design Associate Study Guide, 2nd Edition (640-861) PDF
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Extra resources for CCDA: Cisco Certified Design Associate Study Guide, 2nd Edition (640-861)
ATM switches ATM switches provide high-speed cell switching between both LANs and WANs. 25 and Frame Relay switches connect private data over public data circuits using digital signals. Modems Modems connect private data over public telephone circuits using analog signals. CSUs/DSUs Components of customer premises equipment (CPE), channel service units (CSUs), and data service units (DSUs) are used to terminate a digital circuit at the customer site. These connect to a central office (CO), which is the telephone company switch located closest to the customer.
Unfortunately, companies that worked together or with government agencies often had equipment from different sources. So, the ability to communicate through their networks was at a dead-end, or someone had to incur the exorbitant cost of switching their equipment to their partner’s manufacturer. Ouch! In the early 1980s, the OSI (Open Systems Interconnection) reference model was created by the International Standards Organization (ISO) to break this barrier. , 1151 Marina Village Parkway, Alameda, CA 94501.
It is also responsible for determining if sufficient resources for the intended communication exist. Although computer applications sometimes require only desktop resources, applications may unite communicating components from more than one network application, for example, file transfers, e-mail, remote access, network management activities, client/server processes, and information location. Many network applications provide services for communication over enterprise networks, but for present and future internetworking, the need is fast developing to reach beyond their limits.