Exam 200-150 topic 1 question 21 discussion

Actual exam question from Cisco's 200-150

Question #: 21
Topic #: 1

[All 200-150 Questions]

Which three statements are true concerning RFC 1918 IP addresses? (Choose three.)

A. They are globally routable.
B. They are not globally routable.
C. They must not be filtered at Internet border interfaces.
D. They should be filtered at Internet border interfaces.
E. They include 10.0.0.0/8, 172.16.0.0/16, and 192.168.1.0/24.
F. They include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

Show Suggested Answer

Suggested Answer: BDF 🗳️
"The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)"
http://tools.ietf.org/html/rfc1918

by snapper at Aug. 22, 2019, 9:49 p.m.

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snapper

5 years, 10 months ago

Have to watch the wording (between "should" and "must"). From the RFC: "Routers in networks not using private address space, especially those of Internet service providers, are EXPECTED to be configured to reject (filter out) routing information about private networks." Notice they don't say MUST. That tripped me up. I thought it was a requirement.

upvoted 2 times

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