Cisco CCNA (200-301)IP ConnectivityMedium
A network engineer configures VRRP on two routers serving as the default gateway for VLAN 20. R1 is configured with priority 150 and R2 with the default priority. Which statement correctly describes the resulting VRRP behavior?
- AR1 becomes the Master because it has the higher priority, and the virtual MAC address is 0000.5E00.0114
- BR1 becomes the Master because it has the higher priority, and the virtual MAC address is 0000.0C07.AC14
- CR2 becomes the Master by default regardless of R1's priority
- DBoth routers become Master simultaneously because VRRP does not support priority-based election
Show answer & explanationAnswer & explanation
Correct answer: A. R1 becomes the Master because it has the higher priority, and the virtual MAC address is 0000.5E00.0114
In VRRP, the router with the highest priority (default 100) becomes the Master; R1 with priority 150 wins. VRRP's virtual MAC address format is 0000.5E00.01XX, where XX is the VRID in hex (unlike HSRP's 0000.0C07.ACXX).
Why the other options are wrong
- B. That MAC address format (0000.0C07.ACxx) belongs to HSRP, not VRRP.
- C. R2 has the default priority (100), which is lower than R1's 150, so R2 cannot become Master over R1.
- D. VRRP explicitly uses priority values to elect a single Master router.
VRRP Election and MAC Format
VRRP elects a Master router based on the highest priority (default 100, range 1-254); the virtual MAC address format is 0000.5E00.01xx where xx is the VRID in hexadecimal.
- Default VRRP priority is 100
- Virtual MAC: 0000.5E00.01<VRID in hex>
- Owner of the virtual IP automatically becomes Master with priority 255
Memory trick: Five-E for VRRP's Virtual identity