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

154 CHAPTER 9 Network Management
Long queues or indirect routes avoiding congestion might be some causes
of latency within your VoIP network. Answer D is incorrect because the
Internet is a complex mesh of interconnected routers connected across the
world. There is no single path to a given destination. In fact, some packets
travel in completely different paths and end up at the same destination.
When there are delays in transit, some packets leaving after others might
arrive at the destination first. This variation in packet delay is called “jitter.”
Applications like VoIP cannot effectively be used if jitter is occurring.
5. Correct answer and explanation: B. Answer B is correct because 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 to the Internet. In a
typical network configured for load balancing, once traffic comes into the
network via the one external entry point, it is distributed among other
servers internally connected to share the high traffic volumes.
Incorrect answers and explanation: A, C, and D. Traffic shaping, high availability,
and packet shaping do not distribute incoming network traffic to
other computer devices. Another common term used to describe the control
of computer network traffic to optimize for peak performance is packet
shaping. Increasing usable bandwidth and lowering latency are the goals
of traffic 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. More common is the use of traffic
shaping at the border routers (those bordering your network’s perimeter)
for delaying entering network traffic. 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 that users have the maximum uptime, so they can access network
resources anytime and anywhere.