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Question 173 - 350-401 discussion

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An engineer has deployed a single Cisco 5520 WLC with a management IP address of 172.16.50.5/24.

The engineer must register 50 new Cisco AIR-CAP2802I-E-K9 access points to the WLC using DHCP option 43. The access points are connected to a switch in VLAN 100 that uses the 172.16.100.0/24 subnet. The engineer has configured the DHCP scope on the switch as follows:

The access points are failing to join the wireless LAN controller. Which action resolves the issue?

A.

configure option 43 Hex F104.AC10.3205

Answers
A.

configure option 43 Hex F104.AC10.3205

B.

configure option 43 Hex F104.CA10.3205

Answers
B.

configure option 43 Hex F104.CA10.3205

C.

configure dns-server 172.16.50.5

Answers
C.

configure dns-server 172.16.50.5

D.

configure dns-server 172.16.100.1

Answers
D.

configure dns-server 172.16.100.1

Suggested answer: A

Explanation:

The Option 43 hexadecimal string is assembled as a sequence of the TLV values for the Option 43 suboption: Type + Length + Value. Type is always the suboption code 0xf1. Length is the number of controller management IP addresses times 4 in hex. Value is the IP address of the controller listed sequentially in hex.

On this question, there is 1 controller with management interface IP addresses 172.16.50.5/24. The type is 0xf1. The length is 1 * 4 = 8 = 0x04. The mgmt IP addresses 172.16.50.5 translate to ac.10.32.05 (0xac103205). When the string is assembled, it yields f108c0a80a05c0a80a14. The Cisco IOS command that is added to the DHCP scope is: option 43 hex f104ac103205

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asked 10/10/2024
Anthony Bradley
43 questions
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