Cisco ISR4331/K9 4331 Integrated Services Router

Description
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Cisco ISR4331/K9 4331 Router – Key Specifications

Model: ISR4331/K9
Performance: 100 Mbps default throughput (upgradable to 300 Mbps)
WAN Ports: 3 Integrated WAN connections
NIM Slots: 2 Network Interface Module slots
SM Slot: 1 Service Module slot
Memory: 4 GB DRAM, 4 GB Flash (default)
Power: Internal power supply
Security: Embedded hardware encryption
Voice Support: Yes, with optional modules
Management: Cisco IOS XE, Web UI, CLI
Rack Mount: Yes, 1RU form factor
Dimensions: 44.5 x 38.1 x 4.45 cm
Weight: 6.8 kg

Cisco ISR4331/K9 4331 Integrated Services Router Supports Multi-Service Networks

The Cisco ISR4331/K9 4331 Integrated Services Router is built for businesses needing performance, flexibility, and security. It supports data, voice, video, and wireless services on one device.

With support for 3 WAN ports and modular upgrades, the Cisco 4331 router is ideal for enterprise branches and medium-sized offices. It delivers 100 Mbps performance out of the box and can scale up to 300 Mbps with licenses.

Cisco ISR4331/K9 4331 Integrated Services Router Has High Network Performance

This router is part of Cisco’s ISR 4000 series, which is built for high-speed connections and secure communication. The ISR4331 router supports:

Rich QoS for voice/video
WAN aggregation
IPsec VPN acceleration
Dynamic routing protocols

It’s perfect for enterprise-level deployments looking for reliable and scalable solutions.

Cisco ISR4331/K9 4331 Integrated Services Router Is Modular and Flexible

The Cisco ISR4331/K9 4331 is modular, meaning you can add more ports, services, or memory. It includes:

2 NIM slots for Ethernet, DSL, or LTE cards
1 SM slot for services like unified communications or WAN optimization

This modularity makes the Cisco ISR4331 review stand out for future-proofing and long-term growth.

Cisco ISR4331/K9 4331 Integrated Services Router Includes Secure Features

Security is at the heart of the Cisco ISR4331/K9. The router has built-in hardware encryption for fast and secure VPN tunnels. You also get features like:

Zone-Based Firewall
VPN support (IPsec, SSL, DMVPN)
Identity-based access controls

These tools help protect your business against threats while keeping connections private.

Cisco ISR4331/K9 4331 Integrated Services Router Delivers Voice-Ready Capability

With the right modules, the ISR4331 Cisco voice router can support:

IP phones
VoIP trunking
Digital and analog voice interfaces

This makes it a solid choice for businesses looking for a Cisco router with voice and data in one device.

Cisco ISR4331/K9 4331 Integrated Services Router Offers Strong Throughput

Out of the box, the Cisco ISR4331 throughput is 100 Mbps, enough for many branches and growing offices. You can license boost it up to 300 Mbps, giving room to scale without replacing hardware.

It’s a strong option for businesses seeking a router with integrated services that evolves with usage demands.

Cisco ISR4331/K9 4331 Integrated Services Router Is Built for Centralized Management

Manage the router via:

Cisco IOS XE CLI
Web GUI
Cisco DNA Center

These options simplify updates, performance monitoring, and provisioning. This is why IT teams looking to buy Cisco 4331 appreciate its manageability.

Cisco ISR4331/K9 4331 Integrated Services Router Handles Advanced Routing

As a secure Cisco router, the ISR4331 supports:

OSPF, EIGRP, BGP
IPv4 and IPv6
Static and dynamic routing

This makes it a top choice for organizations needing reliable Layer 3 control and performance.

Cisco ISR4331/K9 4331 Integrated Services Router Is Rack Mountable

Designed for data centers and office racks, the Cisco ISR4331/K9 fits easily into a 1RU slot. Its solid build and small footprint help simplify deployments in tight rack spaces.

If you’re seeking a Cisco router for enterprise use that balances size, power, and performance, this model is ideal.

Cisco ISR4331/K9 4331 Integrated Services Router vs Catalyst 9200L

For networking at the switch level, pair the ISR4331 with the Cisco Catalyst 9200L 48-Port PoE+ Switch C9200L-48P-4G-E. It gives you strong LAN performance, while the ISR4331 manages WAN, voice, and routing.

These two devices together form a complete network stack — one for internal switching and one for external routing and services.