Original sentence: At the destination, the original message may be reassembled in the correct order, based on the packet sequence numbers.Connection-oriented systems include X.Examples of connectionless systems are Ethernet, Internet Protocol (IP), and the User Datagram Protocol (UDP).In connectionless mode each packet is labeled with a destination address, source address, and port numbers.The packets are routed individually, sometimes taking different paths resulting in out-of-order delivery.This information eliminates the need for a pre-established path to help the packet find its way to its destination, but means that more information is needed in the packet header, which is therefore larger.Thus a virtual circuit carrying a byte stream is provided to the application by a transport layer protocol, although the network only provides a connectionless network layer service
Edited sentence: At the destination, the original message/data is reassembled in the correct order, based on the packet sequence number.Connection-oriented protocols include X.Each packet is dispatched and may go via different routes; potentially, the system has to do as much work for every packet as the connection-oriented system has to do in connection set-up, but with less information as to the application's requirements.Each packet is labeled with a destination address, source address, and port numbers.Examples of connectionless protocols are Ethernet, Internet Protocol (IP), and the User Datagram Protocol (UDP).In connectionless mode each packet includes complete addressing information.The packets are routed individually, sometimes resulting in different paths and out-of-order delivery.This precludes the need for a dedicated path to help the packet find its way to its destination, but means that much more information is needed in the packet header, which is therefore larger, and this information needs to be looked up in power-hungry content-addressable memory.Thus a virtual connection, also known as a virtual circuit or byte stream is provided to the end-user by a transport layer protocol, although intermediate network nodes only provides a connectionless network layer service