What is the difference between TcpCommunicationSpi & TcpTcpDiscoverySpi ?

[monstereo]

Here is the config file 
....
<property name="discoverySpi">
                <bean
class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
                    
                    <property name="localPort" value="48500"/>
                    
                    <property name="localPortRange" value="100"/>
.....
<property name="communicationSpi">

                <bean
class="org.apache.ignite.spi.communication.tcp.TcpCommunicationSpi">

                    <property name="localPort" value="48100"/>
                    
                    <property name="localPortRange" value="2"/>



Every node I have created has different tcp discovery local port but same
tcp commication port. Why? 



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