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Exam 100-105 topic 1 question 76 discussion

Actual exam question from Cisco's 100-105
Question #: 76
Topic #: 1
[All 100-105 Questions]


















R1 router clock is synchronized with ISP router. R2 is supposed to receive NTP updates from R1. But you observe that R2 clock is not synchronized with R1. What is the reason R2 is not receiving NTP updates from R1?

  • A. The IP address that is used in the NTP configuration on R2 router is incorrect.
  • B. The NTP server command not configured on R2 router.
  • C. R2 router Ethernet interface that is connected to R1 is placed in shutdown condition.
  • D. R1 router Ethernet interface that is connected to R2 is placed in shutdown condition.
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Suggested Answer: A 🗳️
First we should verify if the ports connected between R1 and R2 is in "up/up" state with the "show ip interface brief" command on R1 & R2.

Note: We learn R1 & R2 connect to each other via E0/2 interface because the IP addresses of these interfaces belong to 192.168.10.0/30 subnet. Both of them are "up/up" so the link connecting between R1 & R2 is good.
Next we need to verify the ntp configuration on R2 with the "show running-config" command:

So there is only one command related to NTP configuration on R2 so we need to check if the IP address of 192.168.100.1 is correct or not. But from the "show ip interface brief" command on R1 we don’t see this IP -> This IP address is not correct. It should be 192.168.10.1 (IP address of interface E0/2 of R1), not
192.168.100.1.
by Quan at Aug. 4, 2019, 4:43 a.m.

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mime
5 years, 5 months ago
Yes the question(s) says "use show commands only" thus the explanations makes sense. Be aware...
upvoted 1 times
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Quan
5 years, 10 months ago
I don't know whether the answer is based on information provided or not. This is because the explanation for the answer goes with ADDITIONAL and NEW information, even some DIFFERENT from the information supplied in the question. That makes me very confused. Or, in the exam, we can see NEW and DIFFERENT information by using "show ...." commands.
upvoted 1 times
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