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The ISR 4000 consists of 3 series of Routers – the ISR 4400 series, the 4300 series and ISR 4200 series whose performance levels are represented by the chart below.

ISR 4000 performance levels by series ISR 4000 Interfaces and Modules Support The Cisco 4000 Series Integrated Services Routers (ISRs) are modular routers with LAN and WAN connectivity. The routers provide for Network Interface Module (NIM) slots and enhanced Service Module (SM-X) slots offering a rich set of modules, such as LAN, WAN and wireless interfaces plus a range of compute engines for embedded services. For the complete list of supported modules on the ISR4000 Series refer to the Interfaces and Modules sheet at https://www.cisco.com/c/en/us/products/routers/4000-series-integrated-services-routers- isr/relevant-interfaces-and-modules.html. Cisco Catalyst SD-WAN with the ISR4000 Series The ISR 4000 series is optimized for Cisco Catalyst SD-WAN. For enterprises this means that business critical applications run faster, with more reliability and reduced Operational Expenditure (OpEx). Cisco Catalyst SD-WAN achieves this by giving all branches and data centers the ability to monitor, control, move and report on streams of application data, such as specific web (HTTP) traffic for example. The ISR 4000 series has deep packet inspection capability and can accurately identify and control thousands of different applications including custom in-house enterprise applications. The benefits are immense:

1. Business-critical applications no longer have to contend each other or with traffic that should be served on best effort basis.
2. The Enterprise network becomes more reliable because multiple paths can be used.
3. Costs are greatly reduced because dual MPLS links can be replaced with a mix of MPLS and Internet.