At which layer of the OSI model does the Spanning Tree Protocol (STP) operate at?()
A、A.Layer 5
B、B.Layer 4
C、C.Layer 3
D、D.Layer 2
E、E.Layer 1
A、A.Layer 5
B、B.Layer 4
C、C.Layer 3
D、D.Layer 2
E、E.Layer 1
A、SALARY form at runtime. B、SALARY form at design time. C、COMMISSION form at runtime. D、COMMISSION form at design time.
A、Create a /var/adm/cron/at.allow file with no entries B、Create a /var/adm/cron/at.deny file with ’*’ as the only entry C、Create a /var/adm/at/at.deny file with ’ALL’ as the only entry D、Create a /var/adm/at/at.allow file with ’NONE’ as the only entry