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Exam 100-105 topic 1 question 77 discussion

Actual exam question from Cisco's 100-105
Question #: 77
Topic #: 1
[All 100-105 Questions]


















Why application that are installed on PC’s in R2 LAN network 10.100.20.0/24 are unable to communicate with Server1?

  • A. A standard ACL statement that is configured on R1 is blocking the traffic sourced from Server1 network.
  • B. A standard ACL statement that is configured on R2 is blocking the traffic sourced from Server1 network.
  • C. A standard ACL statement that is configured on R2 is blocking the traffic sourced from R2 LAN network.
  • D. A standard ACL statement that is configured on R1 is blocking the traffic sourced from R2 LAN network.
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Suggested Answer: B 🗳️
We should check if we can ping from R1 to Server 1 or not:

The ping worked well so maybe R1 is good so we should check R2 first. We notice on R2 there is an access-list:

This access-list is applied to E0/2 interface with inbound direction. The purpose of this access-list is to block traffic with source IP address of 172.16.200.0/24 so it will block all traffic sent from Server 1 to us.
by YR at Sept. 10, 2019, 2:55 p.m.

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YR
Highly Voted 5 years, 7 months ago
Looking at the screenshots, there is an ACL for R1, and there does not seem to be any ACL for R2. Correct answer should be A on that basis. The ACL is also applied to interface Ethernet0/2 on R1. R2 only has DHCP on it realistically and NTP from what I can see
upvoted 5 times
Akli_devops
3 years, 4 months ago
I think thats D but if anyone have more explanation please replay me, thnaks
upvoted 1 times
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