Exam 100-105 topic 1 question 353 discussion

Actual exam question from Cisco's 100-105

Question #: 353
Topic #: 1

[All 100-105 Questions]

For which two reasons was RFC 1918 address space define? (Choose two)

A. to preserve public IPv4 address space
B. to reduce the occurrence of overlapping IP addresses
C. to preserve public IPv6 address space
D. reduce the size of ISP routing tables
E. to support the NAT protocol

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Suggested Answer: DE 🗳️

by paulosrsf at June 26, 2019, 9:29 p.m.

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Quan

5 years, 9 months ago

The answer should be A and D. https://tools.ietf.org/html/rfc1918 Motivation: With the proliferation of TCP/IP technology worldwide, including outside the Internet itself, an increasing number of non-connected enterprises use this technology and its addressing capabilities for sole intra-enterprise communications, without any intention to over directly connect to other enterprises or the Internet itself. The Internet has grown beyond anyone's expectations. Sustained exponential growth continues to introduce new challenges. One challenge is a concern within the community that globally unique address space will be exhausted. A separate and far more pressing concern is that the amount of routing overhead will grow beyond the capabilities of Internet Service Providers. Efforts are in progress within the community to find long term solutions to both of these problems. Meanwhile it is necessary to revisit address allocation procedures, and their impact on the Internet routing system.

upvoted 3 times

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paulosrsf

5 years, 11 months ago

The answer is A and D. The RFC itself explanins that the motivation was preserve IPv4 addresses and ISP overheading.

upvoted 4 times

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