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In addition, there is a basic layer-3 aggregation [22] that allows servers with multiple IP interfaces on the same network to perform load balancing, and for home users with more than one internet connection, to increase connection speed by sharing the load on all interfaces. [23]
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The network layer provides the means of transferring variable-length network packets from a source to a destination host via one or more networks. Within the service layering semantics of the OSI (Open Systems Interconnection) network architecture, the network layer responds to service requests from the transport layer and issues service requests to the data link layer.
Multi-layer switching can move traffic at wire speed and also provide layer-3 routing. There is no performance difference between forwarding at different layers because the routing and switching are all hardware-based – routing decisions are made by specialized application-specific integrated circuits (ASICs) with the help of content ...
[7] DPI-enabled devices have the ability to look at Layer 2 and beyond Layer 3 of the OSI model. In some cases, DPI can be invoked to look through Layer 2-7 of the OSI model. This includes headers and data protocol structures as well as the payload of the message.
6 Layer 3+4 (Protocol Suites) 7 Layer 4 (Transport Layer) 8 Layer 5 (Session Layer) 9 Layer 6 (Presentation Layer) 10 Layer 7 (Application Layer) 11 Other protocols.
TUN, namely network TUNnel, simulates a network layer device and operates in layer 3 carrying IP packets. TAP, namely network TAP, simulates a link layer device and operates in layer 2 carrying Ethernet frames. TUN is used with routing. TAP can be used to create a user space network bridge. [2]
IPX is a network-layer protocol (layer 3 of the OSI model), while SPX is a transport-layer protocol (layer 4 of the OSI model). The SPX layer sits on top of the IPX layer and provides connection-oriented services between two nodes on the network. SPX is used primarily by client–server applications.