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...Figure network layer note the is responsible for delivery of individual packets from source host to destination other responsibilities include following logical addressing physical implemented by data link handles problem locally if a packet passes boundary we need another system help distinguish and systems adds header coming upper that among things includes addresses sender receiver discuss later in this chapter routing when independent networks or links are connected create internetworks large connecting devices called routers switches route switch their final one functions provide mechanism illustrates end as shows now at sends b arrives router makes decision based on f uses its table find next hop e therefore turn transport process entire message an application program running whereas oversees it does not recognize any relationship between those treats each independently though piece belonged separate whether hand ensures whole intact order overseeing both error control flow level...