The Accidental Administrator: What is a Default Gateway?
Chapter 4 - Basic Configuration of a Cisco Router or Switch
routing - Cisco router on a stick with public ip wan (ISP)gateway - Network Engineering Stack Exchange
Configuring NXDB for Cisco Nexus 9000 Series Switches and Communicating with NSXv Controllers (for Layer 2 VXLANs), Release 7.x - Using the Cisco Nexus 9000 Switch as the Default Gateway [Cisco Nexus 9000 Series Switches] - Cisco