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===DDP (Datagram Delivery Protocol)===
 
===DDP (Datagram Delivery Protocol)===
 
A network-layer protocol that prepares and routes packets for transmission on the network.
 
A network-layer protocol that prepares and routes packets for transmission on the network.
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The Datagram Delivery Protocol (DDP) is a connectionless transactionless protocol that transfers data between sockets as discrete packets, or datagrams, with each packet carrying its destination socket address. DDP attempts to deliver any packet with a valid address but does not inform the sender when it cannot deliver a packet, and it cannot request the sender to retransmit lost or damaged packets. This level of service is referred to as best-effort delivery. DDP does not include support to ensure that all sent packets are received at the destination or that those packets that are received are in the correct order. Higher-level protocols that use the services of DDP provide for reliable delivery of data. DDP uses whichever link-access protocol the user selects; that is, DDP can send its datagrams through any type of data link and transport media, provided the network hardware is compatible with [[Open Transport]].
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For applications such as games that do not require reliable delivery of data or diagnostic tools that retransmit at regular intervals to estimate averages, DDP suffices. DDP involves less overhead and provides faster performance than higher-level protocols.
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===LAP (Link Access Protocol)===
 
===LAP (Link Access Protocol)===
 
Works at the data-link layer, converting packets from higher layers into the appropriate form for the physical transmission. Each network architecture needs its own LAP.
 
Works at the data-link layer, converting packets from higher layers into the appropriate form for the physical transmission. Each network architecture needs its own LAP.

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