The Cisco 4000 family Integrated Services Router (ISR) revolutionizes WAN communications in the enterprise branch. With amazing levels of built-in intelligent network capabilities & convergence, it specifically addresses the growing need for application-aware networking in distributed enterprise sites. These locations tend to have lean IT resources. But they often also have a growing need for direct communication with both private data centers & public clouds across diverse links, including Multiprotocol Label Switching (MPLS) VPNs & the Internet. The Cisco 4000 series ISRs consolidate many must-have IT functions, including network, compute, and storage resources. The high-performance, integrated routers run multiple concurrent IWAN services without slowing your data throughput. Cisco ISR 4321 features modular network interfaces with diverse connection options for load-balancing & network resiliency & modular interfaces with online removal & insertion (OIR) for module upgrades without network disruption.