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Exam 300-430 topic 1 question 127 discussion

Actual exam question from Cisco's 300-430
Question #: 127
Topic #: 1
[All 300-430 Questions]

Refer to the exhibit. An engineer is creating an ACL to restrict some traffic to the WLC CPU. Which selection must be made from the direction drop-down list?

  • A. It must be Inbound because traffic goes to the WLC.
  • B. Packet direction has no significance; it is always Any.
  • C. It must be Outbound because it is traffic that is generated from the WLC.
  • D. To have the complete list of options, the CPU ACL must be created only by the CLI.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️

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Mimimimimi
Highly Voted 1 year, 7 months ago
Does not matter which direction is selected. It will always be any for a CPU ACL. Answer is B. Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/access_control_lists.html#:~:text=If%20you%20are%20planning%20to%20apply%20this%20ACL%20to%20the%20controller%20CPU%2C%20the%20packet%20direction%20does%20not%20have%20any%20significance%2C%20it%20is%20always%20%E2%80%98Any%E2%80%99.
upvoted 12 times
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Den07
Highly Voted 3 years, 2 months ago
B should be the answer by looking at the configuration: If the source and destination are any, the direction in which this ACL is applied can be any.
upvoted 8 times
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PicoOstrava
Most Recent 6 months, 3 weeks ago
"For AireOS controllers using versions 6.0 and later, CPU ACLs are applicable for traffic originating both to and from the controller. Thus, when you’re creating the ACLs and attaching them to the CPU, the ACL direction fields do not have any relevance." as per Official Cert Guide
upvoted 1 times
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Vlad_Is_Love_ua
9 months, 2 weeks ago
Selected Answer: B
If you are planning to apply this ACL to the controller CPU, the packet direction does not have any significance, it is always ‘Any’. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/access_control_lists.html#ID2622:~:text=If%20you%20are%20planning%20to%20apply%20this%20ACL%20to%20the%20controller%20CPU%2C%20the%20packet%20direction%20does%20not%20have%20any%20significance%2C%20it%20is%20always%20%E2%80%98Any%E2%80%99.
upvoted 2 times
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Guglielmino
2 years, 1 month ago
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html "Because this example uses any for the Source and Destination fields, you do not have to specify the direction. It can be left at its default value of any."
upvoted 1 times
anonymonkey
2 years, 1 month ago
In this instance, the answer is any but not alway any as the second portion of option B states. per the source documentation referenced, this would only be any due to the source and destination being any making A the best choice.
upvoted 3 times
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malkana
2 years, 2 months ago
CPU ACLs only filter traffic towards the CPU, and not any traffic exiting or generated by the CPU. Note: For the WLC 5500 series in versions 6.0 and later, the CPU ACL is applicable for traffic originated from the WLC as well. For the other WLC platforms, this behavior is implemented in versions 7.0 and later. Also, when creating CPU ACLs direction fields do not have any impact.
upvoted 1 times
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kthekillerc
2 years, 6 months ago
Provided answer is correct, the ACL on the WLC is to parse the incoming traffic to minimize WLC CPU.
upvoted 1 times
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Pawnstar
2 years, 6 months ago
The direction has no significance when it comes to CPU ACL's. B is the right answer.
upvoted 2 times
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Vikiboy
3 years, 1 month ago
Also, when creating CPU ACLs direction fields do not have any impact https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/109669-secure-wlc.html#t4
upvoted 4 times
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maro_moh
3 years, 2 months ago
I think the correct answer is ( B ) because source and destination in the exhibit are Any what do u think ?? https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html
upvoted 5 times
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maro_moh
3 years, 2 months ago
I think the correct answer is ( B ) because source and direction in the exhibit are Any what do u think ?? https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html
upvoted 4 times
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C (25%)
B (20%)
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