I've been taking a few of the pre-tests. I'd like to disagree with a few of the answers or get reasoning
the CCENT module 1 test question number 27. asks which are private IPs.
I answered that the 10.x.x.x was and that the 172.17.x.x was, it marked the 10.x.x.x wrong and
stated that it should've been the 127 address. but that address is reserved for
loopback and not considered private ip space.
question number 22 says which layer of the osi model is most diverse I believe this would be the application layer
but its marked wrong and states its the data link layer.
question 30 asks: Which characteristic is similar between TCP and UDP? and says the correct answer is operates at
layer 4 of the OSI and tcp/ip model. I think this is impossible as
most texts show the tcp/ip model as only having 4 layers, the 3rd corresponding to the osi's 4th layer which is where TCP and UDP are. Is cisco using a 5 layer tcp model by breaking the bottom layer into 2 so that the first 4 layers of both models match up?