Archive for the 'Hands-on' Category
I am going to touch on common mistakes in cisco network monitoring today. You know for sure that you need a network-monitoring tool for managing your network. There are wide varieties of tools available that range from simple to complex and free to enterprise ones.
If you get one monitoring tool and install it, can you say that everything is under control? Are you going to be aware of what happened in your network? I will try to warn you about co...
Maybe I am the worst network engineer in the world or maybe I am unlucky.
Recently, I made an upgrade on some of 6509 switches. I bought totally new 6509-E system including chassis, fan, power, and some new line cards. I also insert my fiber line cards that I used in old 6509 with supervisor 2.
Everything was fine until I checked modules status with “show module” command. Switch was up, new line cards were functioning, but my old WS-X6516-G...
What are your daily duties as the network administrator? You have to keep your network up and running. You have to answer calls which may relate to situations like “X location is down” or “Y location is slow”. You should monitor your network as described below to fulfill the tasks.
You should monitor your network and take actions with respect to situations like device and line failures.
You should analyze line utilizations, errors on the line and ...
Cisco IOS has statefull firewall features like reflexive access lists. By using this feature, you can use your Cisco router as a second firewall (the choke point concept in Cisco firewall trainings) and increase your network security by layered approach.
You can use an access control list (ACL) for the filtering one way traffic, but what about the responding packages. You have to add an incoming ACL and it should include only sessions started from inte...
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