352-001 · Question #542
Which two options are design considerations when introducing FCoE into an existing network? (Choose two)
The correct answer is A. The FCoE QoS markings may overlap with call signaling QoS markings E. All the servers in the data center must be retrofitted with converged Network Adapters. Introducing FCoE requires addressing QoS priority conflicts with existing traffic classes and ensuring servers are equipped with the correct converged hardware adapters.
Question
Which two options are design considerations when introducing FCoE into an existing network? (Choose two)
Options
- AThe FCoE QoS markings may overlap with call signaling QoS markings
- BOptical cabling is needed to transmit FCoE traffic between a server and its directly connected
- CThe existing network must support a MTU of 3280 bytes
- DTwinaxial cabling can be used to transmit FCoE traffic between a server and its directly
- EAll the servers in the data center must be retrofitted with converged Network Adapters
How the community answered
(38 responses)- A74% (28)
- B16% (6)
- C3% (1)
- D8% (3)
Why each option
Introducing FCoE requires addressing QoS priority conflicts with existing traffic classes and ensuring servers are equipped with the correct converged hardware adapters.
FCoE traffic uses Priority Flow Control (PFC) with specific CoS markings, typically CoS 3, which may directly overlap with existing call signaling or voice QoS markings, requiring a careful redesign of the end-to-end QoS policy.
FCoE does not require optical cabling; it commonly runs over copper twinaxial Direct Attach Cables (DAC) for short server-to-switch connections.
FCoE requires an MTU of approximately 2158 bytes to carry a full Fibre Channel frame, not 3280 bytes.
Twinaxial cabling is a valid and widely used option for FCoE server-to-switch connections, but its availability represents a capability rather than a design concern that must be mitigated.
Servers must be equipped with Converged Network Adapters (CNAs) to terminate both Ethernet and Fibre Channel traffic over a single physical 10GbE connection, making hardware upgrades to all FCoE-participating servers a mandatory design consideration.
Concept tested: FCoE design considerations and hardware requirements
Source: https://www.cisco.com/c/en/us/products/collateral/storage-networking/mds-9000-series-multilayer-switches/white_paper_c11-728552.html
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