Excessive latency within a network appears to the end user as a lack of responsiveness. Frustration sets in and often leads the user to reboot or to repeat keystrokes. This response is the same one that might cause you to raise your voice to someone who does not answer your question; you assume that the person hasn't heard the question. In the network environment, however, repeating keystrokes generates more network traffic, which increases congestion and delays. Avoiding this is essential for network health. To do so, build in mechanisms to alleviate congestion and to prioritize certain protocols that are more sensitive to delay.
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