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642-813 Q&A – Implement High Availability (6-10)

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

QUESTION NO: 6
Which one of the statements below correctly describes the Virtual Router Redundancy Protocol (VRRP), which is being used in the Pass4sure 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.
D. None of the other alternatives apply
Answer: B

Explanation:
The Virtual Router Redundancy Protocol (VRRP) feature can solve the static configuration problem. VRRP enables a group of routers to form a single virtual router. The LAN clients can then be configured with the virtual router as their default gateway. The virtual router, representing a group of routers, is also known as a VRRP group.
In a topology where multiple virtual routers are configured on a router interface, the interface can act as a master for one virtual router and as a backup for one or more virtual routers.

QUESTION NO: 7
Examine the router output above. Which two items are correct? (Choose two.)

7
A.Router A will assume the active state if its priority is the highest.
B.If Ethernet 0/2 goes down, the standby router will take over.
C.When Ethernet 0/3 of RouterA comes back up, the priority will become 105.
D.The local IP address of Router A is 10.1.0.6.
E.The local IP address of Router A is 10.1.0.20.
Answer: A C
Explanation:
Since preemption has been configured, we know that when any router comes back up, it will become the active router as long as it has a higher priority value.
In this example, the current priority shows it to be 95. If the interface were to come up, it would now be 95 + 10 (which is the default value) so the total value would then become 105. If fast0/2 were to come up as well, it would then be 105 + 15 (special override as seen in the command) =120.

QUESTION NO: 8
What can be determined about the HSRP relationship from the displayed debug output?

8
A. Router 172.16.11.112 will be the active router because its HSRP priority is preferred over router 172.16.11.111.
B. Router 172.16.11.111 will be the active router because its HSRP priority is preferred over router 172.16.11.112.
C. The IP address 172.16.11.111 is the virtual HSRP router IP address.
D. The IP address 172.16.11.112 is the virtual HSRP router IP address.
E. The nonpreempt feature is enabled on the 172.16.11.112 router.
F. The preempt feature is not enabled on the 172.16.11.111 router.
Answer: F
Explanation:
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.
D: If the Preempt option is set, then an election of the Active router will take place. This process is called a coup. However, an election would take place by default.

QUESTION NO: 9
Which protocol specified by RFC 2281 provides network redundancy for IP networks, ensuring that user traffic immediately and transparently recovers from first-hop failures in network edge devices or access circuits?
A.STP
B.IRDP
C.ICMP
D.HSRP
Answer: D
Explanation:
HSRP is a Cisco-proprietary protocol developed to allow several routers (or multilayer switches) to appear as a single gateway address. RFC 2281 describes this protocol in more detail. Basically, each of the routers that provides redundancy for a given gateway address is assigned to a common HSRP group. One router is elected as the primary, or active, HSRP router, another is elected as the standby HSRP router, and all the others remain in the listen HSRP state. The routers exchange HSRP hello messages at regular intervals, so they can remain aware of each other’s existence, as well as that of the active router.
An HSRP group can be assigned an arbitrary group number, from 0 to 255. If you configure HSRP groups on several VLAN interfaces, it can be handy to make the group number the same as the VLAN number. However, most Catalyst switches support only up to 16 unique HSRP group numbers. If you have more than 16 VLANs, you will quickly run out of group numbers. An alternative is to make the group number the same (that is, 1) for every VLAN interface. This is perfectly valid because the HSRP groups are only locally significant on an interface. HSRP Group 1 on interface VLAN 10 is unique from HSRP Group 1 on interface VLAN 11.

QUESTION NO: 10
Which command will ensure that Company2 will be the primary router for traffic using the gateway address of 172.16.15.20?
A. On R2 add the command standby 1 priority 80
B. On R1 add the command standby 1 priority 110
C. On R1 add the command standby 1 priority 80
D. On R2 remove the command standby 1 preempt
Answer: C
Explanation:
HSRP election is based on a priority value (0 to 255) that is configured on each router in the group. By default, the priority is 100. The router with the highest priority value (255 is highest) becomes the active router for the group. If all router priorities are equal or set to the default value, the router with the highest IP address on the HSRP interface becomes the active router. To set the priority, use the following interface configuration command:

Switch(config-if)# standby group priority priority

When HSRP is configured on an interface, the router progresses through a series of states before becoming active. This forces a router to listen for others in a group and see where it fits into the pecking order. The HSRP state sequence is Disabled, Init, Listen, Speak, Standby, and, finally,
Active.

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