This chapter discusses campus network security and focuses on security features for Cisco switches including port security, storm control, DHCP snooping, IP Source Guard, dynamic ARP inspection, securing VLAN trunks, and private VLANs. It provides an overview of common switch security issues like MAC flooding attacks, VLAN hopping, spoofing attacks, and vulnerabilities in protocols like CDP, SSH, and Telnet. The document emphasizes the importance of enabling security features by default and implementing layers of security to protect the campus network.