Cisco 4331/K9 Rack Mountable Router


Overview of Cisco 4331 Integrated Services Router 

The Cisco 4000 family Integrated Services Router (ISR) revolutionizes WAN communications in the enterprise branch. With new levels of built-in intelligent network capabilities and 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 and public clouds across diverse links, including Multiprotocol Label Switching (MPLS) VPNs and the Internet.

The 4331 Integrated Services Router from Cisco offers a multicore CPU architecture running modular Cisco IOS XE Software that can be quickly adapted to the changing needs of your branch-office environment. It separates control, services, and data plans, providing application-aware network services while maintaining a stable platform and a high level of performance during periods of heavy network load. Additionally, the router is able to integrate application-aware services and scale performance without a complete equipment upgrade. The 4331 features encryption acceleration, voice- and video-capable architecture, application firewall, call processing, and embedded services. The platform supports a range of wired connectivity options, including T1/E1 and fiber Gigabit Ethernet. 


  • Offers services integration with voice, video, security, data, and embedded services

  • Enables deployment in high-speed WAN environments with concurrent services

  • Network agility for cloud-based services

  • Comprehensive application services for visibility, control, and optimization to deploy, monitor, and troubleshoot applications from any location

  • Features FlexVPN unified configuration, robust threat defense with firewall and intrusion-prevention services, and consistent policy enforcement with Cisco TrustSec security

  • Maximizes investment protection by supporting Cisco IOS XE Software, delivered in a single, universal image

Key Specifications

Product Code: Cisco ISR4331/K9

Aggregate Throughput: 100 Mbps to 300 Mbps

Total onboard WAN or LAN 10/100/1000 ports: 3

RJ-45-based ports: 2

SFP-based ports:  2

Enhanced service-module (SM-X) slot: 1

NIM (Network Interface Modules) slots: 2

Onboard ISC slot: 1

Memory: 4 GB (default) / 16 GB (maximum)

Flash Memory: 4 GB (default) / 16 GB (maximum)

Power-supply options: Internal: AC and PoE

Rack height: 1 RU

Dimensions (H x W x D): 44.45 x 438.15 x 438.15 mm

More Information
Product NameCisco 4331/K9 Rack Mountable Router
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