Going through various practice tests saw the following question.
you have been assigned IP address 22.214.171.124/29 and you need to configure the first available IP address on the first available subnet for the router's S0 interface and the first available address on the next available subnet for the E0 interface. Which two commands must you use to properly configure the router's S0 and E0 interfaces? (choose two
a: ip address 126.96.36.199 255.255.255.248
b: ip address 188.8.131.52 255.255.255.248
c: ip address 184.108.40.206 255.255.255.248
d: ip address 220.127.116.11 255.255.255.240
e: ip address 18.104.22.168 255.255.255.248
f: ip address 22.214.171.124 255.255.255.240
g: ip address 126.96.36.199 255.255.255.248
h: ip address 188.8.131.52 255.255.255.240
I: ip address 184.108.40.206 255.255.255.240
I chose C and G, which are correct.
However, shouldnt the actual answer be
ip address 220.127.116.11 255.255.255.248
ip address 18.104.22.168 255.255.255.248
I assume with a /29 being CIDR notation that this is a classless situation so the first and last subnets are not thrown out. Or am I crazy and this is a classful questions so the first subnet is thrown out and that is why they dont offer the 22.214.171.124-7 range in the possible answers?
any help on this is greatly appreciated.
In general, I would agree with you that the .1 and .9 would be the appropriate answers.
However, throughout the CCNA materials, I believe the modus operandi is still considering "subnet-zero" to be unusable.
In real life, we certainly use it, and I believe it's been enabled on routers by default since 11.3 at least.
But in the end, we do what the courseware/exam tells us for the certification!