+ 1 Votes is that PurpleSkys Moderator 1 year ago school work? + 0 Votes Reponse To Answer infinity1495 1 year ago Thanks i really appreciate you explaining and breaking it down for me. As far as packet tracer i understand that not all Show commands work there but GNS3 supposed to work and act like real switches and routers and the answer still doesnt agree with what the book says. + 1 Votes Answer jedi_k9master 1 year ago Answer is C: 192.168.1.40/29 .248 mask uses 5 bits (1111 1000). .42 IP in binary is (0010 1010) The base subnet therefore is the lowest binary value that can be written without changing the output of an AND operation of the subnet mask and IP ... 1111 1000 AND 0010 1010 equals 0010 1000 - which is .40 /24 is standard class C mask. adding the 5 bits from the .248 mask gives /29 thus answer C As an aside: the broadcast address would be the HIGHEST binary value without changing the output of an AND operation of the subnet mask and IP ... 0010 1000 - Base subnet 0010 1111 - (.47) Last three 1's is the highest value without changing the AND operation .. as in .. making it .48 would result in 0011 0000 which changes the outcome of the AND operation against the subnet mask) Thus broadcast address is: .47 usable addresses: .47 - .40 = 7 .. less 2 = 5 usable addresses in that range (take away 2 because the base subnet and broadcast address can't be used as end device IPs) Hope that makes sense. I'm admittedly quite rusty on my IP theory so if I've got anything wrong, please excuse me .. 9and others please feel free to correct me. + 2 Votes Homework Nunob 1 year ago Is funny how after someone says we don't do homework for others that someone still carries on to do the homework for them. We end up with CCNA's in the field that can't do anything I am looking to fire two just like this got a paper cert but not bright enough to use it really takes away from the clout the old CCNA certs had. + 1 Votes Packet Tracer lehnerus2000 1 year ago There are errors in a few Packet Tracer exercises. + 2 Votes OK, in response to the last question about how it works in real life - Deadly Ernest 1 year ago I gather you understand the subnet size and number of hosts id decided by the bit position you mark the subnet at ie 000/xxxxx as against 00000/xxx etc. Well once you do that, what's actually available is shy two host numbers as the very first and last are stolen by the network for administration purposes like broadcasting etc. this happens in ALL networks and sub-networks, the more sub-nets the more admin hosts numbers that are used up. Thus a subnet of 0000/xxxx is technically 16 hosts from .000 to .015 in decimal usage, but .000 and .015 are lost to administration and you get hosts .001 to .014 for actual usage. Now mark the earlier answers with a thumbs up to show they answered the question for you.