100-160: CCST CybersecurityDemo

Question

Which two private IPv4 addresses should be blocked on the Internet to avoid security and performance issues?

Note: You will receive partial credit for each correct selection.

Choose two

A 203.0.113.168
B 192.168.18.189
C 224.0.2.172
D 172.18.100.78

Explanation

RFC 1918 private-use IPv4 ranges include 172.16.0.0–172.31.255.255 (172.16/12) and 192.168.0.0–192.168.255.255 (192.168/16). Thus, 172.18.100.78 and 192.168.18.189 are private addresses and should not be routed on the public Internet.

Learn more

RFC 1918: Address Allocation for Private Internets

100-160: CCST CybersecurityDemo

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Notes

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