9.3.2 Module Quiz - FHRP Concepts (Answers)

9.3.2 Module Quiz – FHRP Concepts Answers

1. What is the purpose of HSRP?

It prevents a rogue switch from becoming the STP root.
It provides a continuous network connection when a router fails.
It enables an access port to immediately transition to the forwarding state.
It prevents malicious hosts from connecting to trunk ports.

Explanation: HSRP is a first hop redundancy protocol and allows hosts to use multiple gateways through the use of a single virtual router.

2. Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?

SLB
HSRP
VRRPv2
GLBP

Explanation: The only nonproprietary FHRP used for router redundancy listed in the options is VRRPv2. HSRP and GLBP are both Cisco proprietary FHRPs. IOS SLB is a Cisco-based solution used to load balance traffic across multiple servers.

3. A network administrator is analyzing first-hop router redundancy protocols. What is a characteristic of VRRPv3?

It works together with HSRP.
It allows load balancing between routers.
VRRPv3 is Cisco proprietary.
It supports IPv6 and IPv4 addressing.

Explanation: VRRPv3 is a non-proprietary, first-hop router redundancy protocol. It provides features for both IPv4 and IPv6 addressing. HSRP and GLBP are both Cisco-proprietary protocols. GLBP provides load balancing between a group of redundant routers.

4. What is a potential disadvantage when implementing HSRP as compared to GLBP?

HSRP provides default gateway failover only when the active router fails.
HSRP does not function in a multivendor environment.
HSRP does not provide load balancing with multiple active routers.
HSRP does not have the capability to support IPv6 addresses.

Explanation: HSRP is a first-hop redundancy protocol that can utilize a group of routers, where a single router is acting as the default gateway and all other HSRP routers will maintain a backup status. GLBP supports load balancing, where multiple active routers can share the traffic load at a single time. Both HSRP and GLBP are Cisco proprietary. HSRP provides default gateway failover when pre-set conditions are met or when the active router fails, and HSRP can support IPv6 addressing.

5. A network engineer is configuring a LAN with a redundant first hop to make better use of the available network resources. Which protocol should the engineer implement?

HSRP
GLBP
FHRP
VRRP

Explanation: Gateway Load Balancing Protocol (GLBP) provides load sharing between a group of redundant routers while also protecting data traffic from a failed router or circuit.

6. When first hop redundancy protocols are used, which two items will be shared by a set of routers that are presenting the illusion of being a single router? (Choose two.)

IP address
BID
hostname
MAC address
static route

Explanation: In order for a set of routers to present the illusion of being a single router, they must share both an IP address and MAC address. A static route, BID, or hostname does not have to be shared in this context.

7. In FHRP terminology, what represents a set of routers that present the illusion of a single router to hosts?

virtual router
default gateway
forwarding router
standby router

Explanation: In FHRP multiple routers are configured to work together to present to hosts a single gateway router. This single gateway router is a virtual router which has a virtual IP address that is used by hosts as a default gateway.

8. A user needs to add redundancy to the routers in a company. What are the three options the user can use? (Choose three.)

HSRP
VRRP
RAID
STP
GLBP
IPFIX

Explanation: Three protocols that provide default gateway redundancy include VRRP, GLBP, and HSRP.

9. Which two protocols provide gateway redundancy at Layer 3? (Choose two.)

HSRP
PVST
STP
VRRP
RSTP

Explanation: HSRP (Hot Standby Routing Protocol) and VRRP (Virtual Router Redundancy Protocol) are both Layer 3 redundancy protocols. Both protocols allow multiple physical routers to act as a single virtual gateway router for hosts.

10. A network administrator is overseeing the implementation of first hop redundancy protocols. Which two protocols are Cisco proprietary? (Choose two.)

IRDP
GLBP
VRRP
VRRPv2
HSRP

Explanation: The first hop redundancy protocols HSRP and GLBP are Cisco proprietary and will not function in a multivendor environment.

11. Which statement describes a characteristic of GLBP?

It provides automatic rerouting if any router in the group fails.
It does not provide support for IPv6.
It provides multiple virtual IP addresses and multiple virtual MAC addresses.
It provides load balancing for a maximum of four gateways.

Explanation: GLBP provides support for IPv6. It provides one virtual IP address and multiple virtual MAC addresses, and there is no such limit of four gateways to provide load balancing.

12. A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement is a feature that is associated with GLBP?

GLBP allows load balancing between routers.
It is nonproprietary.
It uses a virtual router master.
It works together with VRRP.

Explanation: The GLBP first-hop router redundancy protocol is Ciscoproprietary and supports load balancing between a group of redundant routers. VRRPv2 and VRRPv3 are nonproprietary protocols and use a virtual router master.

13. Which statement about HSRP operation is true?

HSRP supports only clear-text authentication.
The active router responds to requests for the virtual MAC and virtual IP address.
The AVF responds to default gateway ARP requests.
The HSRP virtual IP address must be the same as one of the router’s interface addresses on the LAN.

Explanation: Hosts send traffic to their default gateways, which is the virtual IP address and the virtual MAC address. The virtual IP address is assigned by the administrator, whereas the virtual MAC address is created automatically by HSRP. The virtual IPv4 and MAC addresses provide consistent default gateway addressing for the end devices. Only the HSRP active router responds to the virtual IP and virtual MAC address.

14. Which HSRP preemption statement is true?

It enables a router that boots first to become the active router.
It is enabled by default.
It is enabled using the standby preempt interface command.
It is enabled using the standby priority interface command.

Explanation: To force a new HSRP election process when a higher priority router comes online, preemption must be enabled using the standby preempt interface command.

15. Which statement regarding VRRP is true?

VRRP elects a master router and one or more other routers as backup routers.
VRRP elects a master router, one backup router, and all other routers are standby routers.
VRRP elects an active router and a standby router, and all other routers are backup routers.
VRRP is a Cisco proprietary protocol.

Explanation: VRRP selects a master router and one or more other routers as backup router. Backup VRRP backup routers monitor the VRRP master router.

16. A network administrator is overseeing the implementation of first hop redundancy protocols. Which protocol is a Cisco proprietary protocol?

HSRP
IRDP
Proxy ARP
VRRP

Explanation: HSRP and GLBP are Cisco proprietary protocols, and VRRP is an IEEE non-proprietary open standard protocol.

17. Which is a characteristic of the HSRP Learn state?

The router actively participates in the active/standby election process.
The router has not determined the virtual IP address.
The router knows the virtual IP address.
The router sends periodic hello messages.

Explanation: In the Learn state, the router has not determined the virtual IP address and has not yet seen a hello message from the active router. In this state, the router waits to hear from the active router.

18. A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement describes a feature that is associated with VRRP?

VRRP assigns active and standby routers.
VRRP assigns an IP address and default gateway to hosts.
VRRP enables load balancing between a group of redundant routers.
VRRP is a non-proprietary protocol.

Explanation: VRRP is a non-proprietary election protocol that dynamically assigns responsibility for one or more virtual routers to the VRRP routers on an IPv4 LAN.

19. When HSRP is used in a network, what destination MAC address is used in frames that are sent from the workstation to the default gateway?

MAC address of the forwarding router
MAC addresses of both the forwarding and standby routers
MAC address of the standby router
MAC address of the virtual router

Explanation: When frames are sent from HSRP host devices to the default gateway, the destination MAC address of the frame is the virtual router MAC address.

20. What happens to a host in an HSRP network when the active router fails?

The host initiates a new ARP request.
The host stops seeing hello messages from the active router.
The host uses the standby router IP and MAC addresses.
The host will notice little or no disruption of service.

Explanation: When the active router fails, the standby router stops seeing hello messages, assumes the role of the forwarding router, and the host devices see no disruption in service.

21. Which of the following correctly describes GLBP?

It is a Cisco proprietary FHRP and provides redundancy and load sharing.
It is an open standard FHRP.
It uses virtual master routers and one or more backup routers.
It is a legacy open standard FHRP that allows IPv4 hosts to discover gateway routers.

Explanation: GLBP is a Cisco proprietary FHRP protocol that provides redundancy and load balancing (also called load sharing) between a group of redundant routers.