Syngress - Eleventh Hour Network+ Exam N10-004 Study Guide (11 ...

Network Monitoring 149
Table 9.1
Priority Level
Levels of Quality of Service (QoS)
Traffic Type
0 Best effort
1 Background
2 Standard (spare)
3 Excellent load (business critical)
4 Controlled load (streaming multimedia)
5 Voice and video (interactive media and voice) [Fewer than
100 ms latency and jitter]
6 Layer 3 network control reserved traffic (Fewer than 10 ms
latency and jitter)
7 Layer 2 network control reserved traffic (Lowest latency and
jitter)
■ Packet shaping This technique is used by specifying what traffic at what
rate (rate limiting) in a span of time (bandwidth throttling) you are going
to allow in or out of your network.
■ Traffic shaping is more common at the border routers of an environment
working to delay traffic where appropriate as it enters the network.
■ Internal routers and outbound traffic can also be shaped.
■ Traffic policing and traffic contract are terms used to describe how packets
are allowed in/out of the network and at what time.
■ Enforcing compliance with the traffic contract is how traffic sources are
aware of what traffic policy is in effect.
■ Traffic shaping shapes the traffic into optimal network utilization for the
allocated bandwidth on a particular link.
■ Load balancing Load balancing is a technique used on computer networks
to distribute the incoming traffic upon other network devices if there are
indications of increased network traffic or “load.”
■ Load balancing allows a group or cluster of data center servers to share
the inbound traffic all the while seeming as if there actually is only one
external connection.
■ Once traffic enters the network via the one external entry point, it is
distributed among other servers internally connected to share the high
traffic volumes.
■ High availability High availability is a system design protocol, which once
implemented assures a specific degree of uptime continuity in a specific
period of time.
■ The goal of high availability is to ensure users have the maximum uptime
so they can access network resources anytime and anywhere.