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Hi I am still new and studying about networks have here 234.1.18.6/29 address and mask but when I try it out on Packet tracer it gets me an invalid message. I cannot understand why this address are invalid.

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Invalid address is correct: 234.1.18.6 is not a unicast but a multicast address from 224.0.0.0/4. It cannot be used as an interface/source address.

For an interface in a private network you should use an address from RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).

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