Your search for "qsfp28" revealed the following:

Nvidia Mellanox MFA1A00-C015 15m 100GB QSFP28 Active Optical Cable

SKU: NSB-3136
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MFA1A00-C030 30m 100GB QSFP28 Active Optical Cable

SKU: NSN-8620
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Extreme EN-SLX-9640-24S 24x 10G SFP+ 4x 100G QSFP28 No Fans No PSU Switch

SKU: NSH-8533
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Nvidia Mellanox MSN3420-CB2FC 48x 25GB SFP28 12x 100GB QSFP28 B-F P2C CL Switch

SKU: NSB-1033
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7280CR3K-32D4-F 32x 100GB QSFP28 4x 400GB QSFP-DD F-B Switch Router

SKU: NSB-5161
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Ruckus ICX7550-24ZP 12x 2.5GB PoE+ RJ45 10GB PoE+ RJ45 2x 100GB QSFP28 Switch

SKU: NSB-7416
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N540-24Z8Q2C-M 24x 10GB SFP+ 8x 25GB SFP28 2x 100GB QSFP28 Router

SKU: NSN-9652
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Extreme EN-SLX-9030-48S-4C-AC-F 48x 10G SFP+ 4x 100G QSFP28 F-B Airflow Switch

SKU: NSH-8596
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7280CR3-32P4-F 32x 100GB QSFP28 4x 400GB OSFP F-R Switch Router

SKU: NSB-5141
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7260CX3-64-F 64x 100GB QSFP28 2x 10GB SFP+ F-B Airflow Switch

SKU: NSN-9678
Condition: New
Shipping: Overnight Options
Warranty: 365 days