Built on Junos OS and enhanced with Mist AI Wired Assurance, the Juniper EX4400 delivers high-performance access switching for data centre, campus, and large enterprise environments. With multigigabit port support, high PoE/PoE++ budgets, EVPN-VXLAN fabric readiness, and cloud-based management, it’s engineered to meet demanding scale, reliability and security needs.
As a trusted UK Juniper partner, we leverage decades of IT expertise and our network of Juniper-certified technicians to ensure the success of enterprise and data centre EX switch deployments.
Whether your team needs help selecting the right EX4400 model and licensing, or if they could benefit from our pre-configuration service, installation support, and ongoing maintenance, we’re here to support your organisation.
Book a free 30 minute consultation today to discuss your requirements with our experts.
Considering Juniper EX switches to strengthen network performance and resiliency? Our FAQ answers 6 common questions.
Q1: What scale of environments are Juniper EX4400 switches best suited to?
The EX4400 is designed for enterprise campus access, top-of-rack or distribution access layer in data centres, and branch aggregation. With high port densities, multigigabit ports, large switching capacity, and substantial PoE budget, it scales from mid-campus to high-density access layers.
Q2: How secure and resilient is EX4400 in high-availability networks?
It supports MACsec AES-256 encryption (for secure link-level protection), redundant power supplies, field-replaceable fans, hot swap components, and Virtual Chassis technology (up to 10 units) for redundancy and simplified management.
Q3: How does EX4400 handle power demands, especially for PoE/PoE++ devices?
Certain EX4400 models deliver up to 90 W per port and high aggregate budgets (up to 3600 W). They include “fast PoE” to power PoE devices quickly, and “perpetual PoE” that maintains power during reboot, ensuring continuous operation for devices like APs, cameras, IoT endpoints.
Q4: What about throughput, latency, and forwarding scale?
As an example, EX4400-24X delivers up to 1080 Gbps switching capacity, and up to 803 million packets per second forwarding. Large MAC address and route/VLAN tables (e.g. VLANs up to 4093, MAC entries up to 112,000) and large ARP tables support high density of endpoints. Latency is low (wire-rate performance, depending on traffic mix).
Q5: How is management and visibility handled on-premises vs cloud?
Managed via Junos OS locally, but the EX4400 line is fully compatible with Juniper Mist Wired Assurance. Day-0 onboarding, Day-1 provisioning, Day-2+ management from the cloud, with AI-driven telemetry, insights (Marvis), and flow-based monitoring. Network operations teams benefit from reduced MTTR and more visibility.
Q6: How does the EX4400 handle traffic bursts and quality of service at scale?
The EX4400 includes large packet buffers (up to 16 MB per ASIC) and hierarchical QoS with eight hardware queues per port. This ensures consistent performance during microbursts and supports granular traffic prioritisation for latency-sensitive applications, such as real-time voice, video, and financial workloads.
