Which of the following is a private, RFC 1918 compliant IP address that would be assigned to a DHCP scope on a private LAN?
Which of the following is a private, RFC 1918 compliant IP address that would be assigned to a DHCP scope on a private LAN?
10.254.1.50 is a private IP address according to the RFC 1918 standards. The RFC 1918 address space includes the following networks: 10.0.0.0 – 10.255.255.255, 172.16.0.0 – 172.31.255.255, and 192.168.0.0 – 192.168.255.255. IP addresses within these ranges are designated for private use and are commonly assigned in private LANs through DHCP. 127.0.0.100 falls within the loopback range, 169.254.1.50 is a link-local address not used for private networks, and 172.35.1.100 falls outside the private range designated for the 172.16.0.0 – 172.31.255.255 network.
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.
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)
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.