Cisco IOS images for GNS3

Found this link for huge collection of IOS images specifically for GNS3. 

Link 1

Note: None of these files is hosted by Certuniverse.

Cisco Nexus 7000 Series Troubleshooting Guide

Found this document while working on Cisco Nexus 7000 Series switch issue, it was very helpful and did helped in understanding the problem upto certain extent.

http://www.clnchina.com.cn/cisco_learning_open_day/images/nexus__7000.pdf

Cisco Nexus Modules Verification & Testing

Today I was working on one of Nexus-7K's and i realized that one of Sup Engines was failing in module 5, i was not sure what was the exact reason so i performed some tests. If i didn't knew of this command there was no way i was able to know the exact reason. In the end i thought it's worth mentioning on Blog :)

switch# show module

Mod Ports Module-Type Model Status

--- ----- -------------------------------- ------------------ ------------

2 48 10/100/1000 Mbps Ethernet Module N7K-M148GT-11 ok

3 48 10/100/1000 Mbps Ethernet Module N7K-M148GT-11 ok

4 48 10/100/1000 Mbps Ethernet Module N7K-M148GT-11 ok

Linux / Unix Commands Cheat Sheet

I have created cheat sheet for Linux/Unix commands that i normally use for day to day use. This is Ver-1 of document, I will keep on updating if i come across more useful commands. 

Any useful commands can be emailed to certuniverse@gmail.com

http://www.4shared.com/office/p4lNRYAGce/Unix-Linux_Cheat_Sheet_V1.html