Can nickname be duplicate?

[Jackie]

Does Tor identify each node by its nickname? for example, in torrc, a series
of commands such as:

ExcludeNodes nickname,nickname,... 

EntryNodes nickname,nickname,... 

ExitNodes nickname,nickname,... 

 

But when we see at http://torstatus.kgprog.com, (sorted by their names) we
can find a bundle of nodes with the same nickname "unnamed", see following:

 



If I want to remove a node located in China whose nickname also is
"unnamed", I just add "ExcludeNodes unnamed" to torrc. How does tor know
which node I want to remove, perhaps, it removes a node in Europe which I
want to keep.

 

Can anyone explain why?

 

Thanks

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