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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Preempt is enabled by default in VRRP. However, default priority in VRRP is 100. Setting the priority of 100 will not matter, anything higher than 100 assuming the rest of the participating group members are default, will take priority. C is really the only possible answer. A and B are for HSRP and D tracking is really for layering VRRP inside an SD-WAN VPN or SIG.
Though it is true that VRRP default priority is 100, question states WHEN the router has the highest priority. We don't know what the priority is of the other router. For all we know the other router may have a track or has priority set lower than 100 which would make this router have the highest priority. So answer C is viable since preempt is default, even if setting priority to 100 is redundant. The other answers are flat out wrong because either are for HSRP, or bad syntax.
! interface Ethernet0/0 ip address 172.16.113.2 255.255.255.0 vrrp 5 ip 172.16.113.254 ! cisco(config-if)#do s vrrp Ethernet0/0 - Group 5 State is Master Virtual IP address is 172.16.113.254 Virtual MAC address is 0000.5e00.0105 Advertisement interval is 1.000 sec Preemption enabled Priority is 100 Master Router is 172.16.113.2 (local), priority is 100 Master Advertisement interval is 1.000 sec Master Down interval is 3.609 sec cisco(config-if)#