TY - BOOK TI - Test yourself CCNA Cisco certified network associate : (exam 640-507) 2nd ed SN - 007212668X PB - Osborne McGraw-Hill PP - Berkeley, Calif. : Osborne McGraw-Hill, c2001. PY - 2001 UR - https://library.korea.ac.kr/detail/?cid=CAT000000794012&ctype=m