When multiple virtualized network zones (such as VRFs, virtual firewalls, or logical partitions) are consolidated onto a single physical device, the primary concern is:
* A (Fate sharing): A single hardware failure, software crash, or resource exhaustion event could simultaneously impact all virtualized zones, creating a shared risk across multiple otherwise isolated services.
Other options explained:
* B: CPU resource allocation can be controlled via resource management but is not the primary risk.
* C: Congestion control is typically a traffic engineering issue, not a virtualization risk.
* D: Security isolation can be maintained through proper virtualization boundaries.
* E: Bandwidth can be managed through QoS and resource allocation.
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* DUMPS (Designated Unified Multiprotocol Redistribution Strategy) using single-point redistribution with route tagging ensures scalable, loop-free redistribution.
* Route tags prevent redistributed routes from being re-advertised into the originating protocol, avoiding routing loops even with multiple paths.
* Single-point redistribution simplifies operational complexity compared to multipoint redistribution.
Why other options are incorrect:
* A, B, D: ACLs are not scalable for filtering redistributed routes in large networks. Tags provide better control.