1) SNA*ps Gateway requires Apple Token Ring cards. It doesn't support third-party Token Ring cards. SNA*ps Gateway communicates with distributed Macintosh computers via ADSP, so the distributed Macintosh computers can have third-party Token Ring cards as long as they are TokenTalk compatible.
2) The Cisco router provides both AppleTalk routing and source routing bridging, so it should work with SNA*ps running either as a gateway or distributed SNA*ps 3270 on AppleTalk (LocalTalk, EtherTalk, and TokenTalk) networks.
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