Jeffrey Williams completed the Cisco CCNA Routing and Switching: Routing and Switching Essentials course, earning a Certificate of Completion. The course prepared him for a career in technology by teaching him skills like switching concepts, routing protocols, VLAN configuration, ACL configuration, DHCP, DNS, and NAT operations. John T. Chambers, CEO of Cisco, congratulated Jeffrey on gaining the knowledge and skills needed to build and maintain computer networks.