For those that have interest in networking and the CISCO certs, ccna-security, ccsp, ccnp etc. they can test their knowledge and simulate real life network issues, with NetworkSims ProfSIMs simulator package.
From the site:
http://networksims.com/ProfSIMs Premium contains a complete set of simulators for routers, switches, wireless access points (Cisco Aironet 12xx), PIX/ASA firewalls (Version 6.x, 7.x and 8.x), Wireless LAN Controllers (WLC), Check Point, CUCM, AWS, Wireless ADUs, ASDMs, SDMs, Juniper, and much more.
Router, Switch, Wireless Aironet, PIX/ASA, ASDM, SDM, WLC, Modem, Wireless ADU, AWS, Windows/Linux Host, Juniper, Check Point, and VPN simulators.
Over 4,100 unique Cisco Challenges, and over 51,000 Cisco Configuration Challenge Elements.
Certification areas: CCNA, CCNP ROUTE, CCNP SWITCH, CCNP SECURE (New!), CeH, CISSP, CCSP, CCNA Security, CCNA Wireless, CCNA Voice, CCVP, and much more ... all in a single package.
75,000 test questions (and more added every day).
24 hours of Web-based videos.
Over 350 router labs, 210 switch labs, 160 PIX/ASA labs and 80 Wireless labs.
And of course the Packet Tracer which is the defacto simulator tool by the CISCO Academy, here is a Portable version, the most recent 6.01.
The Packet Tracer is VMwared and ready to go, in the RouterSim folder there is the NetworkSims demo, first you install the demo and then copy/paste the MainEmulators patch in your installation folder.
Made by sfarmy
I checked both programs in my hi-tech malware analysis lab, pfft..!, and i didn't noticed any malicious behavior, both seem to be free from viruses, spyware or hobbit sperm, but then again what do i know, so take cautio
n 
.You will need 7-zip to unzip it. Size is 117 MB.
http://upload.evilzone.org/download.php?id=443156&type=zipTake a look at these threads too for extra material on CCNA and the likes:
http://evilzone.org/found-it-on-the-webs/exam-collection-ccna-and-more/http://evilzone.org/found-it-on-the-webs/it-certification-resources-and-training-videos/
