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642-813 Q&A – Implement High Availability (56-60)

Section 5 – Implement High Availability, given a network design and a set of requirements

Refer to the exhibit. Both routers are configured for the Gateway Load Balancing Protocol (GLBP). Which statement is true?


A. The default gateway addresses of both hosts should be set to the IP addresses of both routers.
B. The default gateway address of each host should be set to the virtual IP address.
C. The hosts will learn the proper default gateway IP address from Router A.
D. The hosts will have different default gateway IP addresses and different MAC addresses for each router.
Answer: B

Which protocol enables a group of routers to form a single virtual router and use the real IP address of a router as the gateway address?
A.Proxy ARP
Answer: D

To protect against first-hop router failure, four protocols were developed to ensure IP routing redundancy. Which of the following are they? (Select four)
Answer: ABDF
A: HSRP is the Hot Standby Routing Protocol, which is the Cisco proprietary method for automatic failover and provides for redundant default gateways for hosts.
B: Some newer IP hosts use the ICMP Router Discovery Protocol (IRDP) (RFC 1256) to find a new router when a route becomes unavailable. A host that runs IRDP listens for hello multicast messages from its configured router and uses an alternate router when it no longer receives those hello messages.
D: VRRP is the Virtual Router Redundancy Protocol, which is similar in many ways to HSRP. One key difference is that VRRP is standards based, where HSRP is Cisco developed.
F: Gateway Load Balancing Protocol (GLBP) protects data traffic from a failed router or circuit, like Hot Standby Router Protocol (HSRP) and Virtual Router Redundancy Protocol (VRRP), while allowing packet load sharing between a group of redundant routers.

What can be determined about the HSRP relationship from the displayed debug output?

A.The preempt feature is not enabled on the router.
B.The nonpreempt feature is enabled on the router.
C.Router will be the active router because its HSRP priority is preferred over router
D.Router will be the active router because its HSRP priority is preferred over router
E.The IP address is the virtual HSRP router IP address.
F.The IP address is the virtual HSRP router IP address.
Answer: A
The standby preempt interface configuration command allows the router to become the active router when its priority is higher than all other HSRP-configured routers in this Hot Standby group.
The configurations of both routers include this command so that each router can be the standby router for the other router. The 1 indicates that this command applies to Hot Standby group 1. If you do not use the standby preempt command in the configuration for a router, that router cannot become the active router.

Which three of the following network features are methods used to achieve high availability? (Select all that apply.)
A. Spanning Tree Protocol (STP)
B. Delay reduction
C. Hot Standby Routing Protocol (HSRP)
D. Dynamic routing protocols
E. Quality of Service (QoS)
F. Jitter management
Answer: ACD
Because the importance of high availability networks is increasingly being recognized, many organizations are beginning to make reliability/availability features a key selection criteria for network infrastructure products. With this in mind, Cisco Systems engaged ZD Tag to observe and confirm the results of a series of tests demonstrating the high availability features of Cisco Catalyst
Layer 2/Layer 3 switches. In order to maximize the relevance of the results, the demonstration was based on a model of a “real world” campus (in one of Cisco’s Enterprise Solution Center labs in San Jose , California ).
This switched internetwork consisted of wiring closet, wiring center, and backbone switches and conformed to Cisco’s modular three-tier (Access/Distribution/Core) design philosophy. The testing demonstrated the following high availability and resilience features of Catalyst switches: per-VLAN Spanning Tree (PVST) using Cisco’s InterSwitch Link (ISL) and 802.1Q VLAN Trunking Cisco Spanning Tree Enhancements, including UplinkFast and PortFast Cisco Hot Standby Router Protocol (HSRP) and HSRP Track Cisco IOS per-destination load balancing over equal cost OSPF paths Cisco IOS fast convergence for OSPF.

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