User might just execute one transaction/program but STAD might display many entries for that single transaction/program  each entryis a dialog step in SAP term. How many dialog-steps are displayed under a transaction/program is related to program/transaction design and how that transaction is executed.
Connections of the types TCP, ISO-on-TCP, UDP, ISO and S7 connection are configured in the SIMATIC Manager in NetPro. These connections are configured in the same way in STEP 7 (TIA Portal). In STEP 7 (TIA Portal) the S7 connections have to be configured in the Devices and Networks editor, in the Network view.
In other words, the address which is used by a Routed Protocol (Example IP (Internet Protocol)) has a network address part and a host (a computer inside a network) part. IP (Internet Protocol) is the most widely used Routed Protocol. Internet is using IP (IPv4 or IPv6) as its Routed Protocol. Other Routed protocols are vanishing from network industry. A Routed Protocol is an integral part of network protocol suit and it is available in every device which is participating in network communication (Example, Routers, Switches, Computers etc).