21. The interface visible to the host system passes network layer addresses directly to a physical layer device. 22. The Utah Telecommunication Open Infrastructure Agency provides service at one network layer higher through a fiber network. 23. APPN manages communication between machines, including routing, and operates at the transport and network layers . 24. However using all layers is overkill, as ISO 15765 provides its own Transport / Network layers . 25. The MPLS Header is added between the network layer header and link layer header of the OSI model. 26. NCPs include fields containing standardized codes to indicate the network layer protocol type that the PPP connection encapsulates. 27. You could work your way up through the network layers to try to figure out what is broken. 28. Hop-by-hop is the fundamental characteristic of the IP Internetwork Layer and the OSI Network Layer . 29. A network layer provides automatic replication / distribution of the application graph using a reliable multi-cast system. 30. IP datagrams, Ethernet Frames, or other network layer packets are encapsulated in one or more GSE Packets.
