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I took the exam twice, and these questions were not even in the ballpark for the GSEC. A moderator may not show my comment here. These questions are ancient.
Address ranges to be use by private networks are:
Class A: 10.0.0.0 to 10.255.255.255
Class B: 172.16.0.0 to 172.31.255.255
Class C: 192.168.0.0 to 192.168.255.255
All addresses outside these ranges are considered public.
A) 127.0.0.100 is in the 127.0.0.0/8 loopback range, which is used for loopback addresses and not assignable to physical interfaces.
B) 169.254.1.50 is in the 169.254.0.0/16 range used for link-local addresses, not RFC 1918 private addresses.
C) 10.254.1.50 is correct. 10.0.0.0/8 is a private RFC 1918 range commonly used for private LANs with DHCP.
D) 172.35.1.100 is not correct. This ip is outside of 172.16.0.0/12 range.
So the correct options is C.
RFC1918 Subnets
The RFC1918 address space includes the following networks:
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)
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