Category Archives Networking

Whilst the CCNA Security exam recommends disabling CDP in the production environment, I felt it didn't really explain in depth why it's a good idea. I mean sure, they mention that information about the device is leaked, but what information exactly is leaked? I ran a wireshark capture to find out!     I think the above screenshot of the CDP message explains it…

I recently purchased TCP/IP Illustrated, Vol 1: The Protocols (Highly suggest picking this up, it's extremely insightful, and I hope to learn a LOT more about TCP in the near future) and have been diving into networking as a whole a lot more; one such piece of text I read was on the Windows 'nslookup' tool I hadn't previously known much…

I've set up a very basic lab to test the AAA output for the CCNA Security exam. Both routers have direct connectivity, with R2 having AAA configured as follows: R2#show run | I aaa aaa new-model aaa authentication login default group tacacs+ group radius local aaa authentication enable default enable Note that the enable mode has been set to use…

CCNA Security - 640-554 Study Notes Network Security involves the following: Confidentiality - Encryption Integrity - Hashing Availability - High reliability, fail over Risk Management Assets are something valuable to a company Vulnerabilities is an exploitable weakness in a system or its design - A vulnerability that is not yet discovered is called a latent threat, whereas a discovered vulnerability is…

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