getting help

• can “explore” a command to figure out the syntax:

  
  
  router(config-if)#ip addr ?
  A.B.C.D IP address
  
  router(config-if)#ip addr 169.222.64.1 ?
  A.B.C.D IP subnet mask
  
  router(config-if)#ip addr 169.222.64.1 255.255.255.0 ?
  secondary Make this IP address a secondary address
  <cr>
  
  router(config-if)#ip addr 169.222.64.1 255.255.255.0
  router(config-if)#

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