Tektronix MTS400 Series, Quick Start User Manual

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Installation
In the fi gure, the subnet mask for TVTest_1 indicates that the network address is contained in the fi rst two bytes of the IP
address. In dotted decimal notation, the network address is 128.181. This information allows the device to communicate with
any other device with the same network address without being routed through a default gateway.
TVTest_1 cannot communicate with Carnac, because, according to the subnet mask on TVTest_1, Carnac and TVTest_1 are
logically on the same network. Consequently, messages sent from TVTest_1 to Carnac are never routed. Because these
two devices do not share a connection, TVTest_1 will never
fi nd the correct address for the network card on Carnac and
will not be able to reach Carnac.
TVTest_1 can communicate with TVTest_2 and Rennes because these three devices share a connection, so messages from
TVTest_1 do not need to be routed. TVTest_1 is therefore able to
fi nd the correct addresses for TVTest_2 and Rennes
in spite of having an incorrect subnet mask.
16 MTS400 Series Quick Start User Manual