Your search for "qsfp28" revealed the following:

Ruckus ICX7550-24F ICX 7550 Series 24x 10GB SFP+ 2x 100GB QSFP28 Switch

SKU: NSB-7419
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper ACX6160-T-DC 8x 100GB QSFP28 4x 200GB CFP2- DCO F-B Air (DC) Router

SKU: NSB-5313
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050SX3-48C8-F 48x 10GB SFP+ 8x 100GB QSFP28 F-B Air Switch

SKU: NSN-0142
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW nVidia Mellanox MCX555A-ECAT ConnectX-5 1x 100GB QSFP28 PCIe3.0x16 NIC

SKU: NSN-1088
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper EX9251-8X4C EX9250 Series 8x 10GB SFP+ 4x 100GB QSFP28 Switch

SKU: NSH-9325
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MSN3700-CS2RC 32x 100GB QSFP28 F-B Cumulus Linux Switch

SKU: NSN-9998
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Nvidia Mellanox MSN2100-BB2R 16x 40GB QSFP28 F-B Air (C2P) Onyx Switch

SKU: NSB-6768
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Dell Z9100-ON-RA EMC Z-Series 32x 100GB QSFP28 B-F Air (With OS10) Switch

SKU: NSN-0189
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista CCS-720XP-48ZC2-F 48x MultiGB PoE RJ45 4x SFP28 2x QSFP28 F-B Switch

SKU: NSN-4101
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7280SR3K-48YC8-F 48x 25GB SFP28 8x 100GB QSFP28 F-B Air Switch Router

SKU: NSB-9427
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days