Your search for "qsfp28" revealed the following:
NEW Mellanox MSN2410-CB2F 48x 25GB SFP28 8x 100GB QSFP28 B-F (P2C) Onyx Switch
SKU: NSN-9826
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MFA1A00-C030 30m 100GB QSFP28 Active Optical Cable
SKU: NSB-3135
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MA-CBL-100G-3M 3m 100GB QSFP28 Stacking Cable for MS450 MS355
SKU: NSN-5525
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7500R2A-36CQ-LC 7500R Series 36x 100GB QSFP28 Switch Line Card
SKU: NSN-9200
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148FE-ON 48x 10GB SFP+ 2x 40GB QSFP+ 4x QSFP28 F-B No OS10 Switch
SKU: NSN-9966
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93240YC-FX2 48x 25GB SFP 12x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-1801
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Ruckus ICX7850-48F-E2 48x 25GB SFP28 8x 100GB QSFP28 Switch
SKU: NSN-7019
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme SLX9250-32C SLX 9250 Series 32x 100 Gigabit Ethernet QSFP28 Switch
SKU: NSH-9997
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper EX4650-48Y-AFI 48x 25GB SFP28 8x 100GB QSFP28 B-F Air Switch
SKU: NSN-3465
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista AOC-Q-Q-100G-20M 20m 100GB QSFP28 Active Optical Cable
SKU: NSB-5270
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days