Introduction to computer communication networks and network security. Physical and architectural elements and information layers of a communication network, including communication protocols, network elements, switching and routing, local area networks, and wireless networks. Authentication, cryptography, firewalls, intrusion detection, and communication security, including wireless security. Prerequisite: AUCSC 250. Corequisite: AUCSC 480. Note: Credit may be obtained for only one of AUCSC 455 and AUCSC 355 (2022).