It is called as IPSec concentrators. A router-based VPN essentially used to handle multiple secure connections into the given network. An IPSec concentrator is one of the devices that form the endpoints of the VPN. Other devices could be a server, VPN appliance, or firewall/VPN combination.
someone i feel is a leader in my life id have to say would be my mother because she has give me great advice in life and got me out of tough situations. some characteristics she has are creativity, honesty, commitment, respect for others, and communication. one example of a situation when she demonstrated leadership was when i was working late on homework and i started to get stressed and got upset, she asked me if i needed some , and she me with my work. she demonstrated communication and commitment.
i don't know if this is exactly what your looking for but i hope this !
d) social security number
let me know if i am correct or not, so i can edit the answer.