FHRPs Flashcards
What is the purpose of First-Hop Redundancy Protocols (FHRPs)?
To solve the problem of hosts configuring multiple gateways by creating a virtual IP (VIP) gateway instance shared between Layer 3 devices.
Name three examples of First-Hop Redundancy Protocols (FHRPs).
- Hot Standby Router Protocol (HSRP)
- Virtual Router Redundancy Protocol (VRRP)
- Gateway Load Balancing Protocol (GLBP)
What are the main benefits of deploying FHRPs in a network?
- Reliability
- High availability
- Load balancing
- Failover capability
What does object tracking in FHRPs allow users to do?
Track specific objects in the network and take necessary action when any object’s state change affects network traffic.
How can you track routes in the routing table?
Using the command track objectnumber ip route route/prefix-length reachability.
What is Hot Standby Router Protocol (HSRP)?
A Cisco proprietary protocol that provides transparent failover of the first-hop device acting as a gateway to the hosts.
What is required to enable HSRP?
A minimum of two devices: one active device and one standby device.
What IP address is configured on HSRP-enabled interfaces?
A virtual IP address that belongs to the same HSRP group.
What happens when the HSRP active router fails?
The HSRP standby router assumes control of the virtual IP address and virtual MAC address of the group.
What is the default priority value for HSRP?
100.
True or False: HSRP supports preemption by default.
False.
What multicast address is used by HSRPv1?
224.0.0.2.
What multicast address is used by HSRPv2?
224.0.0.102.
What is the group range for HSRPv2?
0 to 4095.
What are the two versions of Virtual Router Redundancy Protocol (VRRP)?
- VRRPv2: Supports IPv4
- VRRPv3: Supports IPv4 and IPv6
What is the preferred active router in VRRP called?
Master router.
What multicast address does VRRP use for communication?
224.0.0.18.
What command is used to define the VRRP instance?
vrrp instance-id ip vip-address.
What is the command to enable object tracking in VRRP?
vrrp instance-id track object-id decrement decrement-value.
What is the purpose of Gateway Load Balancing Protocol (GLBP)?
To provide gateway redundancy and load-balancing capability to a network segment.
What are the two roles in GLBP?
- Active virtual gateway (AVG)
- Active virtual forwarder (AVF)
What command is used to define the GLBP instance?
glbp instance-id ip vip-address.
What are the three methods of load-balancing traffic in GLBP?
- Round robin
- Weighted
- Host dependent
What is the default load-balancing method used by GLBP?
Round-robin.
What command is used to change the load-balancing method in GLBP?
glbp instance-id load-balancing {host-dependent | round-robin | weighted}.
