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Showing posts from April, 2016

Radius and Tacacs server for Authentication

Radius and Tacacs server for Authentication
When we study for certification regarding Cisco, we encounter topic like Radius or Tacacs Server many times. You all know what are these and when to use them. But will it be beneficial to setup Radius or Tacacs authentication in real production network ?

Suppose you have 20 - 30 devices and there are three network administrator handling those devices in your company. One day you get a news that one of the network engineer is leaving an organization. To comply with company's security policy, you need to delete his/her Login credentials from all 20 - 30 devices. It hardly takes 20 - 30 Min to do that. No problem ! All is well till now.

Now imagine a different scenario in which you are working in even bigger organization which has around 2000 devices and has large network team around 15 - 20 Network admins. Each one of them has different access permissions on the network devices and some of them only have access permissions to limited numb…

Network Engineer should Learn Python

Network Engineer should Learn Python
Suppose you are a Network Administrator or Engineer in a company which has 20 - 30 Network devices like Cisco , Juniper or some other vendors devices. How would you manage these Devices ? Yes you do Telnet or SSH to these devices and do your configuration etc. This is a happy happy situation.
Now lets consider second scenario. Suppose you are handling multi-site company with different offices which are  distributed geographically across country and world too. You have to manage around 1000 different network devices spread around different locations. One day your boss come to you and ask you to change or add new NTP server to these network devices. Aaahhh... Yes he actually means to these 1000 devices!!! Now what will be your first reaction ? How it is possible to Login to each network device and enter the NTP command ? Yes it is possible to just grab your chair and SSH to each and every device manually and put NTP command. What an idiotic and boring…