20. 若在伺服器的紀錄檔中,發現 附圖 一連串大量的記錄內容,最可能發生了下列何種類型的攻擊?
Aug 12 11
39 12 ip 10 1 2 2 sshd[28392] Invalid user admin from remotehost
passwd=pwd
Aug 12 11
39 26 ip 10 1 2 2 sshd[28398] Invalid user admin from remotehost
passwd=admin
Aug 12 11
39 29 ip 10 1 2 2 sshd[28400] Invalid user admin from remotehost
passwd=root
Aug 12 11
39 38 ip 10 1 2 2 sshd[28406] Invalid user admin from remotehost
passwd=1qaz2wsx
Aug 12 20
40 57 ip 10 1 2 254 sshd[29520] Invalid user admin from
remotehost passwd=qwertasdfg