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Guess I gotta update my lesson plan for next year! some info that helped me understand this better: Look up RFC 3021.
Using 31-Bit Prefixes on IPv4 Point-to-Point Links https://datatracker.ietf.org/doc/html/rfc3021
if there was a choice 30 , i would take it b/c Again, the /30 subnet mask provides the most efficient use of IP addresses by not wasting any IP addresses when it is applies to a point to point network connection.so 31 is the best answer .
/31 is correct. On a point-to-point connection, you don't need a broadcast address or a network address. All you need is the IPs for the 2 hosts. /32 is for a single host. /31 is definitely correct.
I did some research and just found out that /31 is actually the correct answer, it works for point to point. Watch this video https://www.youtube.com/watch?v=sCivzbTkjQE
RFC 3021 was introduced to allow the use of /31 subnets specifically for point-to-point links that don’t require a local broadcast. In these networks, any packet sent by one node must be intended for the other node, as there are no other possibilities
For a point to point link you don't use or need a network or broadcast address. It's literally point to point; only two addresses needed here. /31 is the correct answer.
I’m guessing if you’re configuring a Boarder Router / WAN Link a /31 should work.
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