HSRP Questions 4
Here you will find answers to HSRP Questions 4
Question 1
Which three of the following network features are methods used to achieve high availability? (Choose three)
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: A C D
Explanation
STP, HSRP and dynamic routing protocols provide backup paths to reach the destination and achieve high availability.
Note: Quality of Service (Qos) only prioritizes specific type of data over other types and provides no high availability.
Question 2
Which command will ensure that R2 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
By default the priority value of HSRP is 100 so in order to ensure that R2 will be the primary router for traffic using the gateway address of 172.16.15.20 we can set the priority of R2 higher than 100 or set the priority of R1 lower than 100 -> only C is correct.
Question 3
Which command will need to be added to External_A to ensure that it will take over if serial 0/0 on External_B fails?
A. standby 1 priority 130
B. standby 1 preempt
C. standby 1 track fastethernet 0/0
D. standby 1 track 10.10.10.1
Answer: B
Explanation
The “standby 1 preempt” command on External_A router will make External_A take over the active state if it learns that its priority is higher than that of External_B router. In this case, when S0/0 interface of External_B fails, its priority will be 105 – 10 = 95, which is smaller than the default priority value (100) on External_A.
Question 4
Refer to the exhibit and the partial configuration on routers R1 and R2. Hot Standby Routing Protocol (HSRP) is configured on the network to provide network redundancy for the IP traffic. The network administrator noticed that R2 does not became active when the R1 serial0 interface goes down. What should be changed in the configuration to fix the problem?
A. The Serial0 interface on router R2 should be configured with a decrement value of 20.
B. The Serial0 interface on router R1 should be configured with a decrement value of 20.
C. R2 should be configured with a standby priority of 100.
D. R2 should be configured with a HSRP virtual address.
Answer: B
Explanation
When Serial0 of R1 goes down, the priority of R1 is still higher than that of R2 (115 – 10 = 105 > 100) so we should configured the decrement value of 20 on R1 with the command: standby 1 track Serial0 20.
On question 4, as there is not virtual ip address configured in R2 that also cause HSRP to fail.
The standby ip interface configuration command activates HSRP on the configured interface. If an IP address is specified, that address is used as the designated address for the Hot Standby group. If no IP address is specified, the address is learned through the standby function. You must configure at least one routing port on the cable with the designated address. Configuring an IP address always overrides another designated address currently in use
@Atos – I got that question as well
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Hi ,
Could you guys highlight/explain Q3?
Our requirement would contain none of options as the prempt command is not needed on RA.
By default due to configuration, RA would be the active router if s0/0 goes down on RB.
Kindly suggest.
Thank you very much Ninja Spoon for your clarification
I verified Q4 from GNS3.
R2#show standby
FastEthernet0/0 – Group 1
State is Listen
Virtual IP address is 172.16.6.100 (learnt)
Active virtual MAC address is 0000.0c07.ac01
Local virtual MAC address is 0000.0c07.ac01 (v1 default)
Hello time 3 sec, hold time 10 sec
Preemption enabled
Active router is 172.16.6.7, priority 170 (expires in 9.704 sec)
Standby router is 172.16.6.5, priority 105 (expires in 8.756 sec)
Priority 100 (default 100)
Track interface Serial0/0 state Up decrement 10
IP redundancy name is “hsrp-Fa0/0-1″ (default)
R2#show run int fa0/0
Building configuration…
Current configuration : 155 bytes
!
interface FastEthernet0/0
ip address 172.16.6.6 255.255.255.0
speed auto
full-duplex
standby 1 ip
standby 1 preempt
standby 1 track Serial0/0
end
Q2 has no answer as it is already configured to be the Active router
Neither config specifies a priority therefore both are 100. Since R2 has a higher IP address it will become the Active Router. Even if it boots up after R1 it will become active because it is configured for preemption.
With that said, answer C won’t do any harm and may save a few processor cycles :)
@Anonymous
When the interface on RB fails it decrements its priority by the default 10 to 95 (105 -10)
Since RB is still up RA will not take over without being configured for preempt even though it now has a higher priority
hello, I will be much grateful if some can help me to get job in networking field, I have done my CCNA,CCNP (routing ) but I’m working in a rubber manufacturing company where there not much practical networking field even tough I’m the network administrator but the job there is not challenging that can help me to improve on my NETWORKING CAREER .
THANK S
sammycooz86@gmial.com
i think the answer of question 2 is incorrect. Cos, r2 has already had the preempt enabled. r2 must become the active router. thats why, i think r2 do not need even a single command to become active.
@Ozgun
i Agree With u… But u Need 2 Pick An Answer ;)
Q2 – preempt will only work if a router has a higher priority. They both have 100. (default)
R1 could still be the active if it boots first as R2 cannot preempt based on just the higher IP value.
C is correct.
Q4 was in test today.
[[[HSRP]]]]:
Redundancy protocols HSRP, VRRP, and GLBP
http://www.cisco.com/en/US/docs/switches/metro/me3400e/software/release/12.2_58_se/configuration/guide/swhsrp.pdf
http://cisconetworkingcenter.blogspot.com/2013/01/first-hop-redundancy-protocol.html
http://www.ciscopress.com/articles/article.asp?p=766858
This chapter provides information and commands concerning the following topics:
•Hot Standby Routing Protocol (HSRP)
—Configuring HSRP
—Verifying HSRP
—HSRP optimization options
—Debugging HSRP
•Virtual Router Redundancy Protocol (VRRP)
—Configuring VRRP
—Verifying VRRP
—Debugging VRRP
•Gateway Load Balancing Protocol (GLBP)
—Configuring GLBP
—Verifying GLBP
—Debugging GLBP
Hi all,
Thanks to certprepare . I hace passed 642-813 with 98% on 7th may
I concur with Chris’ statement. I labbed it using GNS3. Preempt only works looking at priority values and ignores IP addresses.
An example: Router A with priority 100 and IP address 192.168.1.1 will remain the active router (given it booted first) even when you bring up Router B with same priority 100 but IP address of 192.168.1.100 with preempt enabled.