The problems asks if the first and fourth host are in the same subnet for the first picture. However, it seems quite different from pictures what I typically have seen (picture 2). So I conjectured that this is a combination of bus and star topology, so both hosts are in the same subnet.
But it seems strange a bit because I heard that bus toplogy is old-fashioned topology and star+switch topology replaced it so I can not understand why both bus and switches are used in the first picture.
Are two pictures are same? Is the first picture just ambiguous?