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The QFX5100 line of flexible, high-performance, low-latency and feature-rich Layer 2 and Layer 3 switches are optimized for virtualized data center environments. QFX5100 switches are a universal building block for multiple fabric architectures including Juniper's mixed 1/10/40GbE Virtual Chassis, Virtual Chassis Fabric and QFabric architectures, and open architectures such as Spine and Leaf and Layer 3 fabrics. All QFX5100 switches support In-Service Software Upgrade (ISSU) to deliver hitless data center operations. The QFX5100 switches models have either 24 or 48 port configurations. The 24 port switches can be expanded to a maximum of 32 QSFP+ ports using expansion modules. All switches are available with either AC or DC power supply and with either airflow-in or airflow-out cooling. In legacy switches, or switches with an LCD, this air flow is called front-to-back and back-to-front.