Datagram

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Messages, Segments, Datagrams, and Frames
Messages, Segments, Datagrams, and Frames

The following figure 1 shows the physical path that data takes down a sending end system's protocol stack, up and down the protocol stacks of an intervening link-layer switch and router, and then up the protocol stack at the receiving end system. As we discuss later in this blog,

Tags protocol stack, network layer, datagram
1054
Overview of the Transport Layer in the Internet
Overview of the Transport Layer in the Internet

Recollect that the internet, and more commonly a TCP/IP network, makes available two distinct transport-layer protocols to the application layer. One of these protocols is UDP (User Datagram Protocol), which provides an unreliable, connectionless service to the invoking

Tags application layer, udp, tcp, network application, sockets, datagram, packets, segments
3204
Reliable Data Transfer
Reliable Data Transfer

Remember that the Internet's network-layer service (IP service) is untrustworthy. IP does not guarantee datagram delivery, does not guarantee in-order delivery of datagrams, and does not guarantee the integrity of the data in the datagrams. With IP service, datagrams can

Tags datagram, router, end system, selective acknowledgment, tcp receiver
1474
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
1224
MAC Addresses
MAC Addresses

Because there are both network-layer addresses (for instance, Internet IP addresses) and link-layer addresses (that is, MAC addresses), there is a need to translate between them. For the Internet, this is the job of the Address Resolution Protocol (ARP).

Tags network layer, nodes, router, ip address, datagram
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