ISR4331-V/K9

Q1. Can I connect three ISR 4331 routers for redundancy?

A: Yes — the ISR4331 supports high-availability setups like hot standby, provided configurations and hardware versions are consistent.

Q2. What is the system throughput of the ISR4331-V/K9?

A: It offers 100 Mbps default throughput, upgradable to 300 Mbps with a performance license.

Q3. How many WAN/LAN ports does it have?

A: The router comes with 3 onboard Gigabit Ethernet WAN/LAN ports (2 RJ‑45, 1 SFP combo) plus 2 additional SFP ports.

Q4. What security features are included?

A: It includes built‑in firewall, VPN (IPsec/SSL/flex), and encryption, especially in the V/K9 voice/security bundle.

Q5. Can the ISR4331 handle voice applications?

A: Yes — it supports voice with PVDM4 DSP modules and includes voice-focused bundles like the -V/K9.

Q6. What type of CPU does this router use?

A: It uses a multi-core CPU with separate control, data, and services processing planes under IOS XE.

Q7. Does it support WAN optimization?

A: Yes — it supports Cisco WAAS for WAN acceleration.

Q8. Are there any service module slots?

A: Yes — one SM‑X service-module slot and two NIM slots for expansion.

Q9. How does it support application visibility and control?

A: It includes AVC (Application Visibility and Control) for real-time traffic analysis and QoS.

Q10. What are the benefits of Intelligent WAN?

A: IWAN offers dynamic path selection, traffic optimization, and enhanced reliability across multiple WAN links.

Q11. What are alternative models to consider?

A: Similar models include ISR 4321 (50–100 Mbps), and higher-end ISR 4351 (200–400 Mbps).

Q12. How cost-effective is the ISR4331-V/K9?

A: Very — offers scalable throughput, voice, security, and advanced routing features ideal for branch offices.

Q13. What are the standout characteristics?

A: It features 3 WAN/LAN GigE ports, 2 SFPs, multi-core CPU, 1 SM‑X slot, plus built-in voice, security, AVC, WAAS, and IWAN.

Q14. Where is it best applied?

A: Ideal for enterprise branch offices needing secure, converged voice/data connectivity with flexible WAN support.

Q15. How is it installed?

A: Mount in a 1U rack or shelf, connect WAN/LAN and power, insert modules, then configure via CLI or web interface.

Q16. Does it require regular upgrades?

A: Yes — updating IOS XE and security signatures is recommended for optimal performance and compliance.

Q17. What troubleshooting steps are common?

A: Check interface and port status, confirm module seating, review logs, and verify license and throughput settings via commands like show platform hardware throughput level.

Q18. What accessories are available?

A: Includes PVDM4 DSPs, SM‑X and NIM modules, SFP/LAN/WAN modules, power supplies, rack kits, and console cables.

Q19. How does it compare to similar routers?

A: It strikes a balance between performance and cost in the 4000 series, offering more throughput and modularity than the 4321 but less than the 4351.

Q20. What are the standout features of the ISR4331-V/K9?

A: Includes IVA, AVC, OnePK programmability, voice integration, advanced security, WAAS, and IWAN in a single-platform solution.