VRRP Flashcards
What is VRRP?
An industry-standard FHRP, similar to HSRP.
Instead of active and standby routers, VRRP uses __ and __ routers.
Master and backup.
In VRRP, preemption is __.
Enabled by default.
What is the MAC address of a VRRP router?
00-00-5e-00-01-xx.
In contrast to HSRP, VRRP allows one physical router to share what?
The virtual IP address.
What timers does VRRP use, and how do they relate to HSRP?
VRRP uses a master advertisement interval (hello timer) and a master down interval (hold timer).
What are the default VRRP timers?
Master advertisement interval of one second, master down interval of 3 seconds.
What is the default VRRP router priority?
100.
What does VRRP use instead of interface tracking?
Object tracking. Object tracking works similar to interface tracking but can monitor more device attributes.
What is the default VRRP decrement value?
10, the same as HSRP.
Explain the steps for configuring object tracking.
From global config, create an object to track with “track __(object #)__ __what you’re tracking__”. Then, go into the line config and tell the VRRP group to track the object with, “track __(object #)__ decrement _x_”
Refer to the exhibit. Which Virtual Router Redundancy Protocol (VRRP) statement is true about the roles of the master virtual router and the backup virtual router?
VRRP_master_backup_router.jpg
A. Router A is the master virtual router, and Router B is the backup virtual router. When Router A fails, Router B will become the master virtual router. When Router A recovers, Router B will maintain the role of master virtual router.
B. Router A is the master virtual router, and Router B is the backup virtual router. When Router A fails, Router B will become the master virtual router. When Router A recovers, it will regain the master virtual router role.
C. Router B is the master virtual router, and Router A is the backup virtual router. When Router B fails, Router A will become the master virtual router. When Router B recovers, it will regain the master virtual router role.
D. Router B is the master virtual router, and Router A is the backup virtual router. When Router B fails, Router A will become the master virtual router. When Router B recovers, Router A will maintain the role of master virtual router.
Answer: B
Explanation
RouterA is the master virtual router because of higher priority value.
By default, a preemptive scheme is enabled whereby a higher priority backup virtual router that becomes available takes over for the backup virtual router that was elected to become master virtual router. You can disable this preemptive scheme using the no vrrp preempt command. If preemption is disabled, the backup virtual router that is elected to become master virtual router remains the master until the original master virtual router recovers and becomes master again.
-> B is correct.
Which one of the statements below correctly describes the Virtual Router Redundancy Protocol (VRRP), which is being used in the Company network to provide redundancy?
A. A VRRP group has one active and one or more standby virtual routers.
B. A VRRP group has one master and one or more backup virtual routers.
C. A VRRP group has one master and one redundant virtual router.
Answer: B
Explanation
Unilike HSRP (which has one active router, one standby router and many listening routers), a VRRP group has one master router and one or more backup routers. All backup routers are in backup state.
If you are a network technician, study the exhibit carefully. Which Virtual Router Redundancy Protocol (VRRP) statement is true about the roles of the master virtual router and the backup virtual router?
VRRP
RA(config)# interface f0/0
RA(config-if)# ip address 10.0.0.1 255.255.255.0
RA(config-if)# vrrp 1 priority 110
RA(config-if)# vrrp 1 ip 10.0.0.10
———————————————————————
RB(config)# interface f0/0
RB(config-if)# ip address 10.0.0.2 255.255.255.0
RB(config-if)# vrrp 1 priority 100
RB(config-if)# vrrp 1 ip 10.0.0.10
A – Router RA is the master virtual router, and Router RB is the backup virtual router. When Router RA fails, Router RB will become the master virtual router. When Router RA recovers, Router RB will maintain the role of master virtual router.
B – Router RA is the master virtual router, and Router RB is the backup virtual router. When Router RA fails, Router RB will become the master virtual router. When Router RA recovers, it will regain the master virtual router role.
C – Router RB is the master virtual router, and Router RA is the backup virtual router. When Router RB fails, Router RA will become the master virtual router. When Router RB recovers, RouterRA will maintain the role of master.
D – Router P4S-RB is the master virtual router, and Router RA is the backup virtual router. When Router P4S-RB fails, Router
RA will become the master virtual router. When Router RB recovers, it will regain the master virtual router role.
Answer: B
Explanation:
Router RA is the master virtual router because of its higher priority (110). By default, the pre-empting function is enabled so Router RB will become the master virtual router when RA fails; and when RA recovers, it will take the master role again.
Which router redundancy protocol cannot be configured for interface tracking?
A. GLBP
B. HSRP
C. RPR
D. VRRP
E. SLB
F. RPR+
Answer: D
Explanation
VRRP cannot directly track an interface status but interfaces can be tracked through a tracked object. Notice that HSRP and GLBP can track both object and interface status.
Define VRRP
Virtual Router Redundancy Protocol, pretty much the same as HSRP
What is a VRRP group?
the same as a standby group in HSRP
How does every VRRP command begin?
switch(config-if)# vrrp xx where xx= group number
What is the VRRP master router?
the active router. All other routers are in backup state
