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I have network address with two routers as shown in the picture if the address 12.12.12.1 is reserved as network address and 12.12.12.3 for the broadcast, how can I give the two routers interfaces addresses? there is only one address available which is 12.12.12.2 enter image description here

imad suliman
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Welcome on this Stack Exchange. You made a small mistake in your IP subnet calculation. In 12.12.12.0/30, the 12.12.12.0 address is the network address, 12.12.12.1 and 12.12.12.2 are assignable to the routers and 12.12.12.3 is the broadcast address.

Please see this question and its answers for a more detailed explanation on IP subnet calculation.

Teun Vink
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  • thank you , I will , but isn't this address in the picture the network address ? I didn't write it by my self , it is already in the question topology – imad suliman Nov 08 '18 at 20:48
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    A /30 always has 2 usable addresses. I guess .1 was shown in the picture since that's the IP address of the interface of one of those routers. – Teun Vink Nov 08 '18 at 20:52