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• [CIT]'show interface serial' 결과 해석 및 장애 처리_네트워크관리자_네트워크엔지니어_네트워크취업_ccna학원_ccna자격증ccna학원 protocol is down Hardware is HD64570 Internet address is 10.1.1.1/24 MTU 1500 bytes, BW 1544 Kbit, DLY not set, keepalive set (10 sec) Last input never, output 00:00:01, output hang never Last clearing of blog.naver.com · 2014.01.22