Why i am getting bad mask error can anyone explain ?  

what is abnormal on output of show ip eigrp topology ,is this good or bad if bad how it is 

 what is last input and output logs of interface ,can you any one explain in deep

Can you explain on every parameter mentioned drop down  for the below interface , what does it mean  ? or document or link for study ADRH465HRT#sh int Se0/0/0:0Serial0/0/0:0 is down, line protocol is downHardware is DSX1Description: PPP multilink gro...

On which case we can say there is high interface utilisation Either case 1 when transmit percentage is high Case 2 when  Received percentage is high Or Both should high