Forwarding Table

1710
The Network Layer
The Network Layer

We know that the transport layer provides many forms of process-to-process communication by relying on the network layers host-to-host communication service. We also know that the transport layer does so without any knowledge about how the network layer in fact implements

Tags network layer, router, transport layer, segments, datagram, routing algorithms, forwarding table, packet switch
2093
Virtual Circuit and Datagram Networks
Virtual Circuit and Datagram Networks

Recall from Transport Layer that a transport layer can offer applications connectionless service or connection-oriented service. For instance, the Internets transport layer provides each application a choice between two services: UDP, a connectionless service; or TCP, a connection-

Tags virtual-circuit networks, datagram networks, forwarding table, signaling messages, signaling protocols
2060
Datagram Networks
Datagram Networks

In a datagram network, each time an end system wants to send a packet, it stamps the packet with the address of the destination end system and then pops the packet into the network. As shown in Figure 1, this is done without any VC setup. Routers in a datagram network

Tags datagram network, end system, routers, forwarding table
3528
What's Inside a Router
What's Inside a Router

Now that we've seen an overview of the functions and services of the network layer, let's turn our attention to the network layer's forwarding function - the actual transfer of packets from a router's incoming links to the appropriate outgoing links. We already took a brief look at a few

Tags network layer, line card, router, switching fabric, forwarding table, line speed
1709
IP Datagram Fragmentation
IP Datagram Fragmentation

Well study in "The Link Layer and Local Area Networks" that not all link-layer protocols can carry network-layer packets of the same size. Some protocols can carry big datagrams, whereas other protocols can carry only little packets. For instance, Ethernet frames can carry up to

Tags maximum transmission unit, router, forwarding table, fragment, transport layer, ip datagram
885
Hierarchical Routing
Hierarchical Routing

In our study of LS and DV algorithm, we have looked at the network simply as a collection of interconnected routers. One router was indistinguishable from another in the sense that all routers executed the same routing algorithm to compute routing paths through the entire

Tags routing algorithm, autonomous systems, gateway routers, forwarding table, hot-potato routing
985
Link-layer Switches
Link-layer Switches

As illustrated in Figure 1, modern Ethernet LANs use a star topology, with each node connecting to a central switch. Up until this point, we have been unclear about what a switch actually does and how it works. The role of the switch is to receive incoming link-layer frames and

Tags star topology, buffers, switch table, forwarding table
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