200-155 · Question #127
A network engineer configures FEX0101 on a Cisco Nexus 5596UP switch. Based on the output below, which interface is valid on the FEX? switch# show fex 101 FEX: 101 Description: FEX0101 state: Online…
The correct answer is D. Ethernet 101/1/1. The output indicates a FEX with ID 101 is online and provides information about its fabric interfaces. Valid FEX host interfaces are typically prefixed with the FEX ID followed by the port module and port number.
Question
A network engineer configures FEX0101 on a Cisco Nexus 5596UP switch. Based on the output below, which interface is valid on the FEX? switch# show fex 101 FEX: 101 Description: FEX0101 state: Online FEX version: 7.2(1)N1(1) [Switch version: 7.2(1)N1(1)] Extender Model: N2K-C2248 TP-1GE, Extender Serial: JAF 123456789 Part No: 73-12748-01 pinning-mode: static Max-links: 1 Fabric port for control traffic: Eth1/47 Fabric interface state:
Po147 - Interface Up. State: Active Eth 1/47 - Interface Up. State: Active Eth1/48 - Interface Up. State: Active
Options
- AEthernet 1/46
- BFC 101/1/2
- CEthernet 1/48
- DEthernet 101/1/1
How the community answered
(34 responses)- A6% (2)
- B9% (3)
- C3% (1)
- D82% (28)
Why each option
The output indicates a FEX with ID 101 is online and provides information about its fabric interfaces. Valid FEX host interfaces are typically prefixed with the FEX ID followed by the port module and port number.
Ethernet 1/46 is a physical interface on the parent Cisco Nexus switch, not a host interface on the FEX.
FC 101/1/2 indicates a Fibre Channel interface, but the FEX model N2K-C2248 TP-1GE is an Ethernet FEX, and the interface naming convention for FC is different.
Ethernet 1/48 is a physical interface on the parent Cisco Nexus switch, and the output shows it as a fabric interface for the FEX, not a host interface on the FEX itself.
For a Cisco Nexus FEX, host-facing interfaces are typically identified by a format that includes the FEX ID (e.g., 101) followed by the module number (usually 1) and the specific port number on the FEX (e.g., 1/1), resulting in 'Ethernet 101/1/1'. This structure differentiates FEX interfaces from parent switch interfaces.
Concept tested: Cisco Nexus FEX interface naming
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/fex/n5k_n2k_config_gd/n5k_n2k_config/fex_config.html
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