1
23
C
4
S
client
lookup a.isi.eduserversuw.edu
time
edu is 192.67.67.53lookup a.isi.eduedu
isi.edu is 128.9.0.32lookup a.isi.eduisi.edu
a.isi.edu is 128.9.0.107client
K
isi.edu
2
3+1
Kedu
2T3+1Kmit.edu
2T3
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