Dir Sir: i have a 3560x  and  five 2960s .Each 2960s use  two rj45 cable   as etherchannel connect to 3560x  ,should i use which protocol and which is best ? thanks!!

Dear sir:how to immediately to know the ntp is working  not waiting  automatically ?ex:i use clock set  a error time. and use one command can immediately to sync the time not waiting . I know command ntp server and it is working. but now i want to di...

Hitoday i add a host in a vlan, but it can't ping itself and get  ping transmit failed general failure unless remove the spaning portfast command. i try difeerent vendor PC, IBX... ,HX..,DXl..., all host can't ping itself.the reason is the portfast? ...