ITPEC FE Morning October 2022 Question 34

129.10.9.7 — it lies outside all three private address blocks, so it is a global address.

The private IPv4 ranges (RFC 1918), usable only inside an organisation, are:

• •10.0.0.0/8: 10.0.0.0 – 10.255.255.255
• •172.16.0.0/12: 172.16.0.0 – 172.31.255.255
• •192.168.0.0/16: 192.168.0.0 – 192.168.255.255

129.10.9.7 falls in none of them, so it can be routed on the internet.

Answer (b)

Why not others:

• •(a) 10.10.10.10 — inside the 10.0.0.0/8 private block
• •(c) 172.16.1.5 — inside the 172.16.0.0/12 private block, which runs from 172.16 to 172.31
• •(d) 192.168.20.3 — inside the 192.168.0.0/16 private block

Key rule: Memorise the three private blocks, 10/8, 172.16/12 and 192.168/16; watch 172.x especially, since only 172.16 to 172.31 is private.

Networks · AI-written, may contain errors