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Cisco CCENT CCNA Certification Exam Tutorial: What Are Broadcast Storms? Computers Articles | August 7
, 2007
To earn your CCNA or pass the 640-822 CCENT exam, you must know all about broadcasts and their impact on a network.? Learn these vital details from Chris Bryant, CCIE #12933.
The Cisco CCENT exam demands that you master the fundamentals of networking, and it doesn?t get much more fundamental than broadcasts!? Every network has them
, and every network administrator needs to be aware of what broadcasts are and their potential impact on network performance.
When a device on a network generates a message, it?s one of three types ? a unicast, a multicast, or a broadcast.?? A unicast is a message intended for one other host; a multicast is intended for a group of hosts; a broadcast is intended for every host that can possibly receive it ? and that?s where the trouble can begin.
Why?? Because not every other host needs or wants to receive that message
, and if ?Host A? should not receive broadcasts sent by ?Host B?, we should configure the network accordingly.?? Everything we do on a network has a cost in performance, and if a host is regularly processing messages that it doesn?t need, that will result in a decline in that host?s performance.? That decline may be slight
, but if the host in question is receiving many unnecessary broadcasts, the decline in performance may be significant.? Worse, the impact to our network as a whole may be significant as well.
Broadcasts tend to result in more broadcasts, and if hosts on the network continue to answers broadcasts with broadcasts
, we end up with a broadcast storm.? Broadcast storms start small, but just like a snowball, they can end up being very big ? so big that normal network operations are compromised andor prevented!
Don?t let the threat of a broadcast storm make you nervous about broadcasts, though.? Broadcasts are part of a network?s normal operation
, and we?ve got quite a few methods available to prevent these storms.?? We?ll discuss those in a future Cisco CCENT exam tutorial!
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Keywords: Kaspersky Antivirus Technical Support
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