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This is also the layer where packets may be selected to be sent over a [[virtual private network]] or other [[tunneling protocol|networking tunnel]]. In this scenario, the link layer data may be considered application data which traverses another instantiation of the IP stack for transmission or reception over another IP connection. Such a connection, or virtual link, may be established with a transport protocol or even an application scope protocol that serves as a [[tunneling protocol|tunnel]] in the link layer of the protocol stack. Thus, the TCP/IP model does not dictate a strict hierarchical encapsulation sequence.
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The [[internet layer]] has the responsibility of sending packets across potentially multiple networks. [[Internetworking]] requires sending data from the source [[computer network|network]] to the destination network. This process is called [[routing]].<ref>[http://www.comsci.us/datacom/ippacket.html IP Packet Structure]</ref>
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