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What is the purpose of the link between the core switches during normal operation (when all links are up)?

A company campus LAN requires high availability, soall edge switches have redundant links to the core. As
part of the high availability design, all switches implement Multiple Spanning Tree Protocol (MSTP), and the
core switches implement Virtual Router Redundancy Protocol (VRRP). Protocols are implemented to use links
in the most efficient manner. What is the purpose of the link between the core switches during normal
operation (when all links are up)?

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A.
The link acts as a backup link, blocked by MSTP in each instance but ready to transition to the forwarding
state if necessary.

B.
The link carries any traffic that arrives on the VRRP Backup to the VRRP Master.

C.
The link does not carry any traffic but remains in forwarding state, ready to act as a backup in case another
link fails.

D.
The link carries VRRP messages between the VRRP Master and Backup on all VLANs.

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