The TCP tab shows activity from the client network perspective. The Traffic tab shows generic network activity, without regard to which conversing host is the client and which the server. If a pair of hosts in the same subnet exchanges data, the byte counts for the same conversation can be different on each tab.
On the Traffic tab, byte totals for conversations within the same subnet can appear to be double the totals on the TCP tab. The total bytes exchanged between the two hosts are tallied as they exit the network and as they reenter it. Both directions are included in the total, rather than broken out per host.
On the TCP tab, which reflects the client perspective, the bytes that one host sent and received are tallied for the same time period. The result is a total bytes value that is smaller than the total bytes value on the Traffic tab.
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