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Exam 300-410 topic 1 question 541 discussion

Actual exam question from Cisco's 300-410

Question #: 541
Topic #: 1

Refer to the exhibit. While troubleshooting an issue on the network, an engineer notices that a TCP Connect operation failed on port 3000 between R101 and R201. Which command must be configured on R201 to respond to the R101 IP SLA configurations with a control connection on UDP port 1967?

A. ip sla responder tcp-connect ipaddress 2.2.2.2 port 3001
B. ip sla responder
C. ip sla responder tcp-connect ipaddress 1.1.1.1 port 3000
D. ip sla responder udp-echo ipaddress 1.1.1.1 port 1967

Show Suggested Answer

Suggested Answer: B 🗳️

by Horsefeathers at Feb. 14, 2024, 8:41 p.m.

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Horsefeathers

Highly Voted 1 year, 4 months ago

Selected Answer: B

It has to be B. The only valid responder commands are: ip sla responder ip sla responder udp-echo ipaddress (ip-address) port (port) vrf (vrf)

upvoted 9 times

Horsefeathers

1 year, 4 months ago

I'm sorry that's incorrect, other mentioned commands are also valid. I still think it's B but this explanation instead: "The IP SLA Responder when enabled with the ip sla responder command, does not require the source IP address or the TCP port to be specified. It will listen for control messages on UDP port 1967 and will respond to any IP SLA operations targeted at the device, including TCP Connect to the specified port in the operation."

upvoted 12 times

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Commando1664

Highly Voted 1 year, 3 months ago

Selected Answer: D

It's D. there are 2 IP SLA configured, one for TCP-Connect and one for Jitter. B would would work but this wants UDP on a specific port. So it is D

upvoted 6 times

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XxnightwingxX

Most Recent 3 months ago

Selected Answer: C

C is correct. The shown R1 configuration SLA has no connection and is configured to hit destination address 2.2.2.2 on port 3000. R2 needs to be configured to respond to traffic sourced from 1.1.1.1 on port 3000.

upvoted 1 times

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kldoyle97

7 months, 1 week ago

Selected Answer: B

The responder must match what's configured on the ip sla operation. The responder must be configured with ip target address 2.2.2.2 eliminates C,D leaving B the best option

upvoted 1 times

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tsamoko

8 months, 3 weeks ago

Selected Answer: B

It's definitely B. First of all the tcp-connect failed not upd-echo. Second the ip sla responder is not the 1.1.1.1 is 2.2.2.2 of R201. And third and last , originally tcp-connect control packets are to 1967. So the responder need only 1 command "ip sla responder" . If the sender want to change the default behavior of responder and reply to different port then, then the sender and responder need to configure accordingly R101 : tcp-connect 2.2.2.2 80 ( for example) R201: ip sla responder tcp-connect ipaddress 2.2.2.2 port 80

upvoted 2 times

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Br2

9 months ago

Selected Answer: B

B is correct

upvoted 1 times

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Mohaned990_go

9 months, 1 week ago

Selected Answer: D

it's correct D

upvoted 1 times

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XBfoundX

9 months, 1 week ago

It's B There is not any kind of reason to specify a default port. Even if you activate the command in the C answer if you will block the UDP packets the ip sla responder will go down. By default it listen to the port 1967 so no need to specify it

upvoted 1 times

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Pietjeplukgeluk

11 months, 3 weeks ago

Selected Answer: B

where the responder listens by default == 1967. so no need to change this default.

upvoted 2 times

bk989

10 months, 3 weeks ago

I agree with you B. Refer to my below comment where I labbed this. I actually labbed this in depth, both B and D worked. However B is best.

upvoted 1 times

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revul93

1 year ago

It is B

upvoted 1 times

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dapardo

1 year, 1 month ago

Selected Answer: D

D its the right one to me, additionally in other sites its suggested that UDP setup suggested for the responder is the right one

upvoted 1 times

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jdmpk

1 year, 2 months ago

C is correct. To enable the Cisco IOS IP Service Level Agreements (SLAs) Responder for TCP Connect operations, use the ip sla responder tcp-connect ipaddress command in global configuration mode. see pg 272 in config guide: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/command/sla-cr-book.pdf

upvoted 1 times

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d740f62

1 year, 2 months ago

Selected Answer: D

The answer is literally on the question itself.

upvoted 1 times

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Testerchill

1 year, 3 months ago

I think its B. Given they specifically said that control port is used. Implying no need to specify port and ip at destination. I.e the control port will notify the destination what socket to listen on. "IP SLAs use the control protocol to notify the IP SLAs Responder to enable the target port temporarily. This action allows the Responder to reply to the TCP Connect operation." - https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/xe-16/sla-xe-16-book/sla-tcp-conn.html

upvoted 1 times

Pietjeplukgeluk

11 months, 3 weeks ago

Yes, i agree, the port where the responder listens by default == 1967. so no need to change this default.

upvoted 1 times

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bk989

1 year, 3 months ago

In my lab environment both B and D works: ip sla 1 tcp-connect 1.1.1.2 30000 source-ip 1.1.1.1 threshold 1 timeout 1 frequency 3 ip sla schedule 1 life forever start-time now

upvoted 1 times

bk989

1 year, 3 months ago

with nothing configured on other side: IOU1#telnet 1.1.1.2 Trying 1.1.1.2 ... Open User Access Verification Username: cisco Password: IOU2>exit IOU1# IOU1#show ip sla statistics IPSLAs Latest Operation Statistics IPSLA operation id: 0 Latest RTT: 0 milliseconds Latest operation start time: 01:29:04 UTC Sun Mar 24 2024 Latest operation return code: Socket connect error Number of successes: 1

upvoted 1 times

bk989

1 year, 3 months ago

when i configure ip sla responder, or ip sla responder udp-echo ipaddress 1.1.1.1 port 1967 everytime I telnet the number of successes goes up by one. ""The IP SLA Responder when enabled with the ip sla responder command, does not require the source IP address or the TCP port to be specified. It will listen for control messages on UDP port 1967 and will respond to any IP SLA operations targeted at the device" hence B seems correct, because we can define a port, but don't have to.

upvoted 1 times

bk989

1 year, 3 months ago

to add to this in my original post the number of successes was 0 when i tried to telnet. with nothing configured on other side: IOU1#telnet 1.1.1.2 Trying 1.1.1.2 ... Open User Access Verification Username: cisco Password: IOU2>exit IOU1# IOU1#show ip sla statistics IPSLAs Latest Operation Statistics IPSLA operation id: 0 Latest RTT: 0 milliseconds Latest operation start time: 01:29:04 UTC Sun Mar 24 2024 Latest operation return code: Socket connect error Number of successes: 0 Then I Turned on ip sla responder, telnet succeeded, then turned it off and telnet failed so number of successes was still at 1. Then i tried option D and it worked and number of successes went up to 2. So B or D works. B is better as it is default listening port.

upvoted 1 times

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