Gilbert Held Working with Cisco access lists. 151-154 1999 9 Int. J. Netw. Manag. 3 https://doi.org/10.1002/%28SICI%291099-1190%28199905/06%299:3%3C151::AID-NEM314%3E3.0.CO;2-6 db/journals/ijnm/ijnm9.html#Held99d