Exam 300-420 topic 1 question 229 discussion

Actual exam question from Cisco's 300-420

Question #: 229
Topic #: 1

Refer to the exhibit. A customer is planning to onboard three new VPN partner connections in the data center. The new subnets must not overlap with the existing data center network, and the subnet size must not be bigger than necessary. The customer dedicated 10.1.8.0/21 for this design. How must the subnets be divided to meet these requirements?

A. Partner-A: 10.1.11.0/25 -

Partner-B: 10.1.12.0/22 -
Partner-C: 10.1.11.128/27
B. Partner-A: 10.1.12.0/25 -

Partner-B: 10.1.13.0/22 -
Partner-C: 10.1.12.128/26
C. Partner-A: 10.1.11.0/25 -

Partner-B: 10.1.13.0/23 -
Partner-C: 10.1.11.128/27
D. Partner-A: 10.1.11.0/24 -

Partner-B: 10.1.13.0/23 -
Partner-C: 10.1.12.128/26

Show Suggested Answer

Suggested Answer: A 🗳️

by 314_pi at May 20, 2023, 5:50 p.m.

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mgiuseppe86

7 months, 3 weeks ago

Selected Answer: A

A is the closest answer but I dont get it. For Partner A a /25 wont work, but just barely. 126 users total... a /25 gives you 128 IPs, 2 reserved for network and broadcast (10.1.11.0 and 10.1.11.127) 1 for gateway (let's say 10.11.1.1) so down to 125 usable IPs. 1 User is getting hosed and replaced as a gateway. D works for Partner A however Partner B overlaps with Partner C. 10.1.13.0/23 is not a valid network ID as in a /23 every even-network is a correct ID 10.1.12.0/23 10.1.14.0/23 10.1.16.0/23 etc B is wrong because Partner Bs network overlaps with A and D.. a /22 is again every-even network divisible whole by 4. So 10.1.12.0 to 10.1.15.255 C is wrong because Partner B doesnt allow enough addresses. /23 is 512 IPs, 2 for broadcast/network, so down to 510. The scenario asks for 511. so you need an entire /22 to cover this.

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Clauster

9 months, 2 weeks ago

Selected Answer: A

The correct answer is A. Partner-A: 10.1.11.0/25 - Provides 126 hosts Partner-B: 10.1.12.0/22 - a /23 is 510 hosts, because we require 511 we need /22 which provides 1024 Hosts Partner-C: 10.1.11.128/27 - Provides up to 30 hosts.

upvoted 2 times

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CKL_SG

12 months ago

Selected Answer: A

Answer a is correct

upvoted 2 times

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314_pi

1 year ago

Selected Answer: D

Partner A has 126 users. So, more than /25 is needed.

upvoted 1 times

CKL_SG

12 months ago

/25 have 126 usable host, why not enough? Answer a is correct

upvoted 1 times

314_pi

12 months ago

Picture shows that Partner A has 126 users... not hosts.. At least, it require a defatult-gateway is needed... 127 IP address will be required as minimun.

upvoted 1 times

314_pi

12 months ago

but, you are right... because in D Partnet B couldn't be allocate all the users... I will asume A is right :-D

upvoted 3 times

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