Since there was no internet back then, life was hard, the buyers had to pay more money, and it was very difficult. Nowadays it's different. People could just stay home go on the internet and choose a car, then the next day or a few more days, there car is right in their parking lot. Hoped this helps! :)
Implementation hiding i<u>s the encapsulation of method details within a class</u>. Implementation can be interpreted as those specifications which can be altered without altering the correctness of an application. Wrapping data/methods within classes (descriptions of the way all objects of this type will look/act) in combination with implementation hiding is called encapsulation. Information users need to know about behaviors should be available without dependence on implementation specifications.
I suggest you to read OpenSSL changelogs to make it more clear. As there's not enough space to describe how it works. But heartbleed resistan version was 1.0.2, as I know.
192.168 suggests class C networks which have a 24 bit netmask (255.255.255.0) but you haven't provided enough info, like the netmask of a working machine, to be definite.
