Your search for "QSFP28" revealed the following:
NEW Dell S5248F-ON 48x 25GB SFP28 2x QSFP28-DD 4x QSFP28 F-B No OS10 Switch
SKU: NSN-9940
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5200-48Y-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-3632
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5296F-ON-RA 96x 25GB SFP28 8x 100GB QSFP28 B-F Air (No OS10) Switch
SKU: NSN-9939
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4128T-ON 28x 10GB 2x 100GB QSFP28 F-B Air 210-ALTC (No OS10) Switch
SKU: NSN-9178
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell QSFP28-100G-LR4 GMFC5 100GB BASE-LR4 1310nm SMF LC QSFP28 Transceiver
SKU: NSH-6164
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5200-48Y-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSH-8256
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista QSFP-100G-CWDM4 100GB BASE-CWDM4 SMF Optical QSFP28 Transceiver
SKU: NSN-5677
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5248F-ON 48x 25GB SFP28 2x 200GB QSFP28-DD 4x 100GB QSFP28 F-B Switch
SKU: NSN-1910
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON-RA 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 B-F OS10 Switch
SKU: NSB-6590
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista QSFP-100G-SWDM4 100GB BASE-SWDM4 70m OM3/100m Duplex MMF QSFP28
SKU: NSN-0315
Condition: New
Shipping: Overnight Options
Warranty: 365 days