Part of the Cisco® 1000 Series Integrated Services Routers (ISR), the ISR 1100 Series and ISR 1100X Series are powered by Viptela® operating system or IOS XE SD-WAN operating system. These devices combine WAN and comprehensive security in a wired high-performance platform. The ISR 1100 Series and ISR 1100X Series combine an enterprise grade platform with best-in-class SD-WAN. The ISR 1100 Series come with 4GB DRAM, whereas the ISR 1100X Series offer 8GB DRAM Cisco Software-Defined WAN (SD-WAN) is a cloud-first architecture that provides unparalleled visibility across your WAN, optimal connectivity for end users, and the most comprehensive security platform to protect your network. Cisco SD-WAN provides transport independence, rich network, and security services as well as endpoint flexibility. The ISR 1100 Series and ISR 1100X Series routers are delivered as platforms that sit at the perimeter of a site, such as a remote office, branch office, campus, or data center. They participate in establishing a secure virtual overlay network over a mix of any WAN transports.