ISR4331-SEC/K9
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Cisco ISR4331-SEC/K9 Integrated Services Router

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ISR4331-SEC/K9 Overview

Cisco

ISR4331-SEC/K9 is the Cisco ISR4331/k9 router with Security Bundle. Its other specifications are the same as ISR4331/k9.

Quick Specs

Product Code Cisco

ISR4331-SEC/K9
Bundle Security Bundle
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
Package Weight 12.96 Kg
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Type Cisco ISR4331/K9 with Security Bundle
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 slots 1
Doublewide service-module slots 0
NIM slots 2
OIR (all I/O modules) Yes
Onboard ISC slot 1
Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) 4 GB
Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) 16 GB
Default memory DDR3 ECC DRAM (data plane) NA
Maximum memory DDR3 ECC DRAM (data plane) NA
Default memory DDR3 ECC DRAM (control/services plane) NA
Maximum memory DDR3 ECC DRAM (control/services plane) NA
Default flash memory 4 GB
Maximum flash memory 16 GB
External USB 2.0 slots (type A) 1
USB console port -type B mini (up to 115.2 kbps) 1
Serial console port - RJ45 (up to 115.2 kbps) 1
Serial auxiliary port - RJ45 (up to 115.2 kbps) 1
Power-supply options Internal: AC and PoE
Redundant power supply N/A
AC input voltage 100 to 240 VAC autoranging
AC input frequency 47 to 63 Hz
AC input current range, AC power supply (maximum) 3 to 1.3A
AC input surge current 60 A peak and less than 5 Arms per half cycle
Typical power (no modules) (watts) 42
Maximum power with AC power supply (watts) 250
Maximum power with PoE power supply (platform only) (watts) 530
Maximum endpoint PoE power available from PoE power supply (watts) 250

Frequently Asked Questions

What is Cisco ISR4331-SEC/K9?

The ISR4331-SEC/K9 is a Cisco 4000 Series Integrated Services Router bundled with the Security (SEC) license. It is designed for enterprise branch networking where secure WAN connectivity, modular expansion, and scalable routing performance are required.

Can ISR4331-SEC/K9 be expanded or upgraded?

Yes. The router supports: 2 × NIM slots for WAN/network modules SM-X service modules Additional SFP and accessory expansion This allows organizations to adapt the router for changing business needs.

What does “SEC” mean in ISR4331-SEC/K9?

“SEC” indicates that the router comes with Cisco’s Security Bundle, enabling advanced security capabilities such as secure VPN connectivity and protected WAN communication. It is chosen by organizations that need secure branch networking out of the box.

What ports and interfaces are available on ISR4331-SEC/K9?

Key connectivity includes: 3 × onboard WAN/LAN Gigabit ports 2 × RJ-45 interfaces 2 × SFP ports 2 × NIM expansion slots 1 × SM-X service module slot This modular design allows businesses to scale network connectivity easily.

Is ISR4331-SEC/K9 suitable for branch office deployment?

Yes. Cisco designed the ISR4331 series for enterprise branch offices, providing secure WAN access, modular scalability, and stable performance for distributed business locations.

Does ISR4331-SEC/K9 support VPN and secure networking?

Yes. The Security bundle enables enterprise-grade secure WAN connectivity with support for encrypted traffic and VPN deployment — a top reason this model is widely used in enterprise branches

Why is ISR4331-SEC/K9 still popular in enterprise networking?

It remains popular because of: Stable enterprise performance Integrated security licensing Modular architecture Proven Cisco reliability

Is ISR4331-SEC/K9 still supported?

The ISR 4000 Series has entered lifecycle transition, but many enterprises continue using ISR4331-SEC/K9 because of long Cisco support timelines and strong reliability in existing networks. (Lifecycle checks are among the most searched enterprise queries.)

What is the difference between ISR4331-SEC/K9 and ISR4321?

Main differences include: ISR4331-SEC/K9 → higher throughput (100–300 Mbps) ISR4321 → lower performance tier ISR4331 offers more scalability and ports This comparison is frequently searched by buyers evaluating branch router upgrades.

Is ISR4331-SEC/K9 suitable for SD-WAN deployments?

Yes. ISR4331 routers support Intelligent WAN (IWAN) and can be used in modern SD-WAN environments where centralized management and application-aware routing are required.


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