What Is Qos?

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Quality of service (QoS) is the set of techniques designed to manage network resources.CCIE Exams(http://www.cathayschool.com ) QoS refers to the capability of a network to provide better service to selected network traffic over various LAN and WAN technologies. The primary goal of QoS is to provide flow priority, including dedicated bandwidth, controlled jitter and latency (required by some interactive and delay-sensitive traffic), and improved loss characteristics.

The following section defines QoS in terms of measurable characteristics. It is important,however, to recognize that fully understanding QoS requires more than a definition. To trulyunderstand QoS, you must understand the concept of managed unfairness, the necessity for
predictability, and the goals of QoS. In addition to a definition of QoS in measurable terms, the following section explains each of these things, to provide you with a well-rounded and practical definition of QoS.QoS is defined in several ways, ccie routing and switching (http://www.cathayschool.com/ccie-routing-and-switching-1-on-1-classes.html ) and the combination of all of these ...
... definitions is really the best definition of all. A technical definition is that QoS is a set of techniques to manage bandwidth, delay, jitter, and packets loss for flows in a network. The purpose of every QoS mechanism is to influence at least one of these four characteristics and, in some cases, all four of these.

Bandwidth itself is defined as the rated throughput capacity of a given network medium or protocol. In the case of QoS, bandwidth more specifically means the allocation of bandwidth, because QoS does not have the capability to influence the actual capacity of any given link. That is to say that no QoS mechanism actually creates additional bandwidth, rather QoS mechanisms enable the administrator to more efficiently utilize the existing bandwidth. Bandwidth is sometimes also referred to as throughput.

While QoS has become an essential technology for those organizations rolling out a new generation ofnetwork applications such as real-time voice communications and high-quality video delivery, most of the literature available on this foundation technology for current and future business applications focuses on IP QoS. Equally important is the application ccie security ( http://www.cathayschool.com/ccie-security-1-on-1-classes.html ) of QoS in the campus LAN environment, which is primarily responsible for delivering traffic to the desktop.