三台路由器，问：在路由器B（即中间的那台路由器）上的E0/1的IN方向做一个ACL，要求路由器A可以TELNET路由器C，但是路由器C不可以TELNET路由器A。要求写出ACL命令行。

【参考答案】

ACL：
Deny tcp host A eq 23 host C
Permit ip any any

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