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Question 181 - 300-420 discussion

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An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?

A.

/24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15

Answers
A.

/24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15

B.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous /24 prefix per site

Answers
B.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous /24 prefix per site

C.

/25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch

Answers
C.

/25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch

D.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12

Answer: B

Answers
D.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12

Answer: B

Suggested answer: B

Explanation:

For example:

Site 0001

Data:10.0.0.0/24

Voice: 10.0.1.0/24

summary route : 10.0.0.0/23

Site 0002

Data:10.0.2.0/24

Voice: 10.0.3.0/24

summary route: 10.0.2.0/23

....cont...

site 0129

Data:10.1.0.0/24

Voice: 10.1.1.0/24

summary route: 10.1.0.0/23

site 0130

Data:10.1.2.0/24

Voice: 10.1.3.0/24

summary route: 10.1.2.0/23

so 3rd octet is odd number assigned to voice, and even number assigned to data;

for security team to recongize voice prefix, use an ACL with wildcast to filter odd number on third

octet, started from 10.0.1.0 0.0.254.255, 10.1.1.0 0.0.254.255......, 10.1.1.0 0.0.254.255 etc; for 10.0.1.0 0.0.254.255, any IP in binary that started with 00001010.00000000.xxxxxxx1.xxxxxxxx will be matched (x = either 0 or 1), covert 3rd

octet into dec, for example, 10000001 = 129 which is a voice VLAN.

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asked 07/10/2024
Angel Molina
41 questions
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