An essay related to Networking Essential Example


Networking Essentials: Quality of Service

Networking Essentials: Quality of Service

Quality of service (QoS) means the ability of a network to offer better service to designated network traffic over numerous technologies such as Ethernet and 802.1 networks, Frame Relay, SONET, and Asynchronous Transfer Mode (ATM) among others (Cisco Systems, 1999). The main aim of QoS is to offer priority comprising of dedicated bandwidth, enhanced loss characteristics, and regulated jitter and dormancy (needed by some interactive and real-time traffic) (Cisco Systems, 1999). Moreover, QoS helps to guarantee priority for data or traffic flow or flows that ensure end users can effectively achieve their goals on different network-related applications.

QoS is needed for several reasons that are all founded on optimum efficiency in different fields such as small corporate network, enterprise network, or internet service provider. QoS is required to control resources that are being used on the network such as bandwidth, wide-area facilities and equipment (Cisco Systems, 1999). For instance, QoS can limit bandwidth for FTP transfer and offer higher priority to significant database access. Again, QoS is needed for efficient application of network resources through network analysis management tools that can help to know how the network is being used. QoS also offers tailored services through visibility and control allowing internet service providers to provide carefully custom-made grades or classifications of service differentiation to consumers (Cisco Systems, 1999). For instance, ISPs can offer different bandwidth plans at different prices to meet consumer needs and preferences. Last but not least, QoS facilitates synchronicity of mission-critical applications ensuring that the most significant applications work effectively (Cisco Systems, 1999). This ensures that multimedia and telephony services are offered the needed bandwidth and least delays without interfering with critical applications.

The operation of QoS mechanisms is based on the QoS architecture for implementation. QoS operations are based on QoS marking and identification methods needed for coordination from end to end among network elements (Cisco Systems, 1999). Moreover, it also operates under the single network elements through queuing, traffic-shaping applications, and scheduling. Its operation also covers accounting, policy, and management functions to regulate and administer traffic across networks. The first step is identification and marking where a privileged service to a category of traffic is identified. When identified, the packet is either marker or not marked leading to what is known as classification (Cisco Systems, 1999). Unmarked packets are known as pre-hob basis while marked packers continue to IP precedence through signaling and differentiation. To manage congestion of voice/data/video data, QoS offers different queuing tools such as weighted fair queuing, priority queuing, and custom queuing among others (Cisco Systems, 1999). QoS also offers traffic shaping and policing (Cisco Systems, 1999). Shaping is applied to develop a traffic flow that restricts the full bandwidth probable of the flow while policing also means the same thing but traffic that surpasses the designed rate is not protected.

QoS is also faced with numerous challenges. The first major challenge is network neutrality that is a concept where user traffic is not victimized at all in terms of traffic generated by different network users (Cisco Systems, 1999). This means that internet service providers cannot slow or speed up web content based on its destination, ownership, and source. Different laws and policies also limit the ability to control traffic from different users. Another challenge is applying QoS without losing the main benefits of IP or other networks.


Cisco Systems, 1999. Cisco IOS 12.0 Quality of Service. Indianapolis: Cisco press.