Midterm 2 grade distribution:

99
98
92 (2x)
91
83
81
78 (2x)
73
68
65
63
62 (2x)
61 (2x)
59 (2x)
56 (2x)
54
52
47 (2x)
46
45
44
41 (2x)
38
19

I am very disappointed.
Only 5 students did problem 4 right: that is the kind of problem
anybody awake during class, who reviews notes shortly after class,
should have done right, even without further studying.  
Several students made a mess of problem 3. For example, saying that a
SYN and a FIN are of the same flow even though port numbers do not
match up.