Dear those experts who are familiar with Directory Protocol, I just search on Atlas for Authorities Directories and found there are 10, include "Tonga". But when I check the Consensus Health I found that "Tonga" is not on the list of "Signatures", "Known flags", "Number of relays voted about", "Consensus methods"; while the node named "consensus" did not appear in Atlas, but is on those list and can vote the "network status". So may question is that: Is "Tonga" really an Authority Directory? IS "Tonga" and "consensus" a same node? Thank you in advance!
The difference is because Tonga is a little special. Unlike the other directory authorities Tonga doesn't vote in the consensus (iirc it's the bridge authority). Take a peek at the following list...
Note that Tonga doesn't have a v3ident. Tonga is an authority, but doesn't vote so for things like Consensus Health which are concerned with the consensus it's moot.
Thank you Damian for your quick response to my question. I think I got your point about "Tonga", but how about the node named "consensus" highlighted in blue? Is it just a virtual node designated for the final agreement between other nodes' votes? thank you in advance! Mar 6, 2015 at 0:08
1Nope, 'consensus' isn't a relay. Directory authorities each vote on what they think should the network should look like. These individual votes are tallied, and the majority determines the 'consensus'. The consensus is the de-facto definition of who's a tor relay, and used by clients (tor users) to make their circuits. This is a way of distributing trust so a single malicious authority (or even a group of them) can't hurt users.– DamianMar 6, 2015 at 6:57