Chapter 1
Introduction
1.1
Introduction
The Internet has grown rapidly in last decade. Its growth has both posed
opportunities and threats to many business activities. It has become a global
channel of communication to include all businesses. The internet is expected
to become a medium of communication that would provide a differentiated
level of service on the same internet infrastructure. Thus, this differentiated
level of service would include data and voice communications that should
also be able to provide real and reliable network services as well. In order to
provide many services to the same infrastructure network, IETF has proposed
many QoS technologies like DiffServ, IntServ and MPLS.
Presently, there exists 2 different levels at which QoS is specified with no
mapping between them. Application level QoS which are specificed as SLAs
(Service Level Agreements) are specified and usually dealt with only at the
application level. Network lower level details which are specified in terms of
1