Quality of Service (QoS)
Quality of service technologies are intended to handle what sheer bandwidth or data-compression techniques cannot - that is, guaranteed timely delivery of specific application data or resources to a particular destination or destinations.
QoS advantages:
- Guarantees bandwidth for key applications and users.
- Can put off the need for faster network infrastructure.
- Can help in network planning by measuring and managing traffic flow.
QoS disadvantages:
- Management-software packages are a must to avoid complex configuration challenges.
- Implementations may require swapping out some old gear.
- Can create political problems as battles arise over who gets the good QoS and who controls it.
Vendors rely on a variety of underlying technologies to provide quality of service:
IEEE standards 802.1P and 802.1Q
- Support quality of service at Layer 2.
- 802.1P provides for eight traffic classes drawn from priority fields in 802.1Q VLAN tags.
Differentiated Services
- Supports quality of service at Layer 3.
- Offers up to 64 priorities of services.
Type of service
- Supports quality of service at Layer 3.
- Supports eight levels of priority.
From Bandwidth: Quality over quantity?, Network World, 04/08/02.
Also see: Class of Service
There are 3 comments:
QoS
By Nigel Blackie
Jonathon,
You can use VOIP and 802.1P that provide QoS and to that don't, use Infrared and HTTP.
Hope that helps
Nigel Blackie
qos
By jonathon
could anyone help with my question please,
3) Give two examples of a networking technologies that provide QoS, and two that don’t. Illustrate how your definition given in part one could be used to justify the choices you have made.
QoS
By sunil
It is good that this page has some info abt the QoS. It is better if u added some more in details, Propabley with some real life examples.
sunil
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