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Exam 350-401 topic 1 question 58 discussion

Actual exam question from Cisco's 350-401

Question #: 58
Topic #: 1

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:
Network 172.16.100.0 255.255.255.0

Default Router 172.16.100.1 -

Option 43 ASCII 172.16.50.5 -
The access points are failing to join the wireless LAN controller. Which action resolves the issue?

A. configure option 43 Hex F104.AC10.3205
B. configure option 43 Hex F104.CA10.3205
C. configure dns-server 172.16.50.5
D. configure dns-server 172. 16.100.1

Show Suggested Answer

Suggested Answer: A 🗳️

by [deleted] at Jan. 31, 2022, 11:48 p.m.

Comments

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ihateciscoreally

Highly Voted 1 year, 12 months ago

im here just to remember answer, if they want me to do hex maths in my head on the exam then they lost their mind.

upvoted 42 times

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nushadu

Highly Voted 2 years, 8 months ago

Selected Answer: A

#python3 ip_addr = [int(i) for i in '172.16.50.5'.split('.')] print(ip_addr) for i in ip_addr: print(f'dec={i}, hex={str(hex(i))[2:]}') #output: [172, 16, 50, 5] dec=172, hex=ac dec=16, hex=10 dec=50, hex=32 dec=5, hex=5

upvoted 10 times

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thanhnv142

Most Recent 3 months, 1 week ago

Selected Answer: A

Answer A. We know it needs hex, so must be A or B. But in B, we can easily see CA >172, so must be A

upvoted 1 times

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AbdullahMohammad251

11 months, 3 weeks ago

Selected Answer: A

The hex string is assembled by concatenating the TLV values shown below: Type + Length + Value (1) The type is always f1(hex): F1 (2) Length is the number of controller management IP addresses times 4 in hex: We have a single WLC with a single management IP address ---> 1 x 4 = 4 = (04) in hex represented as 2 hex digits. (3) Value is the IP address of the controller listed sequentially in hex: 172.16.50.5 = AC10.3205 172 ---> AC 16 -----> 10 50 -----> 32 5 -------> 05 configure option 43 Hex F104.AC10.3205 https://www.cisco.com/c/en/us/td/docs/wireless/access_point/1550/installation/guide/1550hig/1550_axf.pdf

upvoted 2 times

AbdullahMohammad251

11 months, 3 weeks ago

Using the command `configure option 43 ASCII "172.16.50.5"` with the management IP address enclosed in double quotes would also work.

upvoted 1 times

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techriese

2 years, 1 month ago

Selected Answer: A

A is correct

upvoted 1 times

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Asymptote

2 years, 9 months ago

Selected Answer: A

check this article how to convert option 43 hexidecimal. https://www.rapidtables.com/convert/number/hex-to-decimal.html?x=F104 Option 43 IP to hexi converter https://shimi.net/services/opt43/

upvoted 2 times

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dougj

2 years, 10 months ago

Using ASCII characters for the IP address are only supported for the older Cisco 1000 series APs, all the rest require HEX characters

upvoted 2 times

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dranzer6

3 years ago

Selected Answer: A

shimi.net/services/opt43 Vendor Cisco: f1 (hex) IP count: 1 IP count * 4 bytes = 4 ---> 04 (hex) 172.16.50.5 = ac103205 (hex) option 43 hex f104.ac10.3205

upvoted 3 times

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Pudu_vlad

3 years, 2 months ago

provided answer is correct

upvoted 1 times

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winder

3 years, 2 months ago

I dont get it, shouldn't the "Option 43 Ascii 172.16.50.5" work? Why we have to use hex option here?

upvoted 3 times

AbdullahMohammad251

11 months, 3 weeks ago

option 43 ASCII “172.16.50.5” - would have worked Because the quotation marks must be included. https://www.cisco.com/c/en/us/td/docs/wireless/access_point/1550/installation/guide/1550hig/1550_axf.pdf

upvoted 1 times

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