A company campus LAN requires high availability, so all 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)?

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.

Explanation:
VRRP advertisement packets are exchanged on the link between the two Core
switches. This link is veryimportant and a failure can lead to a VLAN that is cut into 2 parts which
will cause communication disruption.So, it is recommended to configure a trunk of 2 links or more
between the two Core switches for better redundancy
Example:

Reference: How to configure Virtual Router Redundancy Protocol (VRRP) on HP ProCurve
switches