Network analyzer software

The network I'm on is having slowness issues occasionally, on top of that I've been tasked to draw out a network map.  What are my options available for a network analyzer program.  I want someone I can use to show me the network as a whole and report on it.  Not just 1 PC at a time.  Also what tools can I use to aide in my network map drawing as It's quite difficult to trace where every single cable goes without unplugging servers and such.
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serjoshAuthor Commented:
something with a trial version that can be tested first would be nice

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FOr your network analyzer, you could use Ethereal, wich is the best, FREE open-sourced tool on the net.. it works beautifully:

From the site:

"Ethereal is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education. It has all of the standard features you would expect in a protocol analyzer, and several features not seen in any other product. Its open source license allows talented experts in the networking community to add enhancements. It runs on all popular computing platforms, including Unix, Linux, and Windows."

ANd for your network drawing, i'm going to suggest to you what most people use, Visio:
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Btw, to use ethereal, you have to to connect your computer on a HUB, because only hubs receive packets from all the networks since there is no micro-segmentation on them.. If you use it on a switch, you have to use a managable switch and enable port listening on one port (also known as SPAN or port monitoring), which copies a portion of the switch’s traffic to a specific port,  and plug your workstation using the network analyzer on it..
It Sound like you is Hp OPENVIEW

It can map out every node, hub, switch, router on your need work.
A real easy SNMP to use is NetCrunch by AdRem Software:

This is a very easy tool to use and has a very friendly user interface.  You can view whats going on with multiple PC's at a time also.
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