ENVS 1200 Lecture Notes - Lecture 6: Differentiated Services, Streaming Media, Oxymoron
13 May 2018
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ENVS 1200 Tutorial 6 Notes – Network security
Introduction
• Modern routers, sometimes called DiffServ capable nodes, can then prioritize and route
packets based on the packet class.
• Interestingly, there are no ground rules on the basis neither for setting the DS field, nor
for the way the routers make decisions based on the class of service
• It is generally agreed that routers prioritize streaming multimedia if they can do so
without reatig ajor ogestio at the routers ode ad eod.
• Currently, the DiffServ approach appears to be the most successful in practice.
• However, its success is contingent on a number of factors
• The major factor is sufficient network capacity to minimize congestion at router nodes.
• QoS is a complex topic with many nuances and implications for the design and use of
networks.
• There are references to QoS in a number of networking specifications, and many books
and articles written about various facets of QoS.
• A few of these are indicated in the For Further Reading section at the end.
• The words etwork seurit are a ooro.
• Networks are inherently insecure.
• Therefore, strong security measures must be taken independently of the network to
protect the components of the network as well as the data flowing through the
network.
• Security measures are an essential part of any system, large or small.
• The issue of computer system and network security is a broad and extensive topic
• It is often taught as a separate course.
• We shall only touch the surface in this discussion.
• Our focus is upon issues related specifically to network security measures that are an
essential part of the design of any network infrastructure.
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