A facility available for Cisco routers that enables one host to contact another host through a firewall. It grants access on a per-user basis.
"Cisco lock and key." YourDictionary, n.d. Web. 23 October 2018. <https://www.yourdictionary.com/cisco-lock-and-key>.
Cisco lock and key. (n.d.). Retrieved October 23rd, 2018, from https://www.yourdictionary.com/cisco-lock-and-key
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