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Exam 200-355 topic 1 question 467 discussion

Actual exam question from Cisco's 200-355
Question #: 467
Topic #: 1
[All 200-355 Questions]





The AP is unable to join the WLC. What switch configuration will correct this problem?

  • A. interface vlanl ip helper-address 10.10.10.10
  • B. interface vlan20 ip helper-address 10.10.10.10
  • C. ipdhcp pool vlanl option 43 ascii '10.10.10.10'
  • D. ip dhcp pool vlan20 option 43 ascii '10.10.10.10'
  • E. ipdhcp pool vlanl option 43 hex f1040a0a0a0a
  • F. ip dhcp pool vlan20
Show Suggested Answer Hide Answer
Suggested Answer: F 🗳️
Keep the following in mind when troubleshooting wireless DHCP issues:
Option 43 is used to inform the DHCP client of the WLC AP-management IP address. Use the ip dhcp pool command for VLAN 20 and enter the AP-management
IP address as part of option 43.
The command format is option 43, followed by the correct IP address in hexadecimal format, as shown in the example.
If there is only one WLC management address, the Length is 04 (hex), and in this case the WLC management IP address is 10.10.10.10, which is 0a0a0a0a (hex).

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Highpass
5 years, 7 months ago
E 1. The dynamic AP management wasnt enabled on the VLAN 20. Dynamic AP Management ACTS LIKE an AP-Manager interface. (For obsolete WLC) 2. The option 43 must a hex (for any type AP) EXCEPT VxWorks 1000 Series 3. References : https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/97066-dhcp-option-43-00.html#anc10 https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_010011011.html
upvoted 2 times
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karora
5 years, 8 months ago
Appears like answer option has missing config statement.
upvoted 1 times
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mueller
5 years, 9 months ago
D would be correct for Cisco Aironet 1000 Series APs (VxWorks) (1010/1020/1030/1505/1510) Series ONLY. The correct answer for all other Cisco Aironet APs would be: ip dhcp pool vlan20 option 43 hex f1040a0a0a0a (https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/97066-dhcp-option-43-00.html#anc10)
upvoted 2 times
abd123
5 years, 5 months ago
but in d vlan is 1 not 20 !!
upvoted 1 times
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GoldenChild
5 years, 10 months ago
Its hex the option 43
upvoted 1 times
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xtrattitude4u
5 years, 11 months ago
Correct answer is D, which matches the description of why it is correct. The AP and Controller are on different subnets so the AP will need option 43 to know the WLC MGMT interface. The command syntax while configuring the DHPC pool is: option 43 ascii [IP address(es)] Answer F makes no sense becuase the DHCP pool already exists, so this command does nothing. Also, nowhere in the screenshots does it show that the WLC MGMT interface has the IP 10.10.10.10, that must be assumed.
upvoted 1 times
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