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300-610 · Question #10

Which statement about Cisco UCS fabric interconnects running in end host mode is true?

The correct answer is D. Only downstream MAC addresses are stored in the CAM table.. Cisco UCS Fabric Interconnects in end host mode function as an end host to the upstream network, meaning they only store MAC addresses of downstream servers in their CAM table. They do not participate in Spanning Tree Protocol, simplifying the upstream network.

Compute Design

Question

Which statement about Cisco UCS fabric interconnects running in end host mode is true?

Options

  • ABroadcast and multicast can be received on all of the uplinks.
  • BvPC-connected uplinks will forward on all of the paths.
  • CFabric Interconnects participate in the spanning tree.
  • DOnly downstream MAC addresses are stored in the CAM table.

How the community answered

(22 responses)
  • B
    5% (1)
  • C
    5% (1)
  • D
    91% (20)

Why each option

Cisco UCS Fabric Interconnects in end host mode function as an end host to the upstream network, meaning they only store MAC addresses of downstream servers in their CAM table. They do not participate in Spanning Tree Protocol, simplifying the upstream network.

ABroadcast and multicast can be received on all of the uplinks.

Fabric Interconnects in end host mode do not flood broadcast and multicast traffic received on one uplink out to all other uplinks; they act as an end host to the upstream network.

BvPC-connected uplinks will forward on all of the paths.

While upstream vPC connections might utilize multiple paths, Fabric Interconnects in end host mode do not actively forward traffic between their uplinks themselves; they are designed to act as a transparent pass-through for server traffic.

CFabric Interconnects participate in the spanning tree.

Fabric Interconnects running in end host mode do not participate in Spanning Tree Protocol (STP) to simplify the upstream network design and prevent potential loops, effectively being STP-transparent.

DOnly downstream MAC addresses are stored in the CAM table.Correct

In end host mode, Cisco UCS Fabric Interconnects store only MAC addresses learned from downstream servers in their CAM table, presenting these MAC addresses to the upstream network as if they were directly connected to the upstream switch.

Concept tested: Cisco UCS Fabric Interconnect end host mode

Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/3-1/b_UCSM_GUI_Configuration_Guide_3_1/b_UCSM_GUI_Configuration_Guide_3_1_chapter_01101.html

Topics

#Cisco UCS#Fabric Interconnect#end host mode#CAM table

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