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i rewiew my router configuration and i found :-

ip route Serial1/0:1

ip route FastEthernet0/0

what we mean by two command ??? and what we mean by and

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up vote 4 down vote accepted

Let's dissect this one line at a time.

ip route Serial1/0:1

The first ip route command will dictate Serial1/0:1 as a default interface for all packet routing.

ip route FastEthernet0/0

The second ip route command dictates that any network packet that is seeking for a destination address that's within the range of will be routed through FastEthernet0/0

The value of is a subnet mask value. It is a deterministic value that defines that scope of the network that your router has been assigned to handle.

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I would just add to to Michael's excellent response that the mask is called a host mask and specifies a single network device. – Peter Nov 25 '10 at 12:20

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