Simple definition
TACACS+ centralizes the authentication of network equipment administration.
Technical definition
TACACS+ separates the AAA functions and more encrypts the content of the transaction than the RADIUS traditional.
What is it used for?
accurately control admin accesses to routers, Switches andGartens.
Practical example
a network administrator uses its registered account to access the SSH equipment.
Common issues
- AAA server unavailable
- incorrect shared key
- local fallback absent
Key takeaway: Always adapt the diagnosis to the product version and the architecture actually deployed.