Transport layer is the fourth layer in the OSI model. Transport layer is responsible for process to process delivery of entire message. Other than that it also control connection, flow of data and error , thus will resend the packet if it get lost in between.
If we are sending a file in one go and if some error occurred in between the file transfer then the complete file has to be resend which wastes the bandwidth so to prevent this, the file to send is divided in to smaller unit which we call packet, and then send packets 1 by one so that if a packet is lost then we need to send only that particular packet not the complete file.
A packet may be lost due to congestion: too many packets are sent, the queue gets full, and eventually the router or switch starts dropping packets. It may also occur due to different failures; including temporary cabling problems, problems in a switch or router, etc.; these in turn can cause temporary problems with the routing information (a "non-converged network"), causing the packets to travel in loops until the TTL runs out, or a router erroneously concluding that a certain address can't be reached. This latter problem might also be caused by a misconfigured router.
That means that if an IP packet is sent, there is no guarantee that it will arrive. If it doesn't arrive, IP will do nothing to re-send it. If it is necessary to re-send lost packets, higher-level protocols (usually TCP) take care of that.
UDP is much simpler than TCP. UDP does not do any sort of handshaking, connection establishment, or acknowledgements for received packets. UDP packets are simply sent over the network with no expectation of a return message. Since there are no methods for acknowledging that a packet has been received within UDP, there is no guarantee of the order in which packets will arrive. Sometimes, they may be lost all together. UDP is not the most reliable protocol within the IP suite, but it does have several important uses.Q. Which is an important characteristic of UDP?Simply answer is A.) · minimal delays in data delivery.In other words there are minimal delays in the travel of data from the sender to the receiver.
Session Layer traced lost Packets.
At which layer lost packets are traced?
About 20%
I had to detect the man that was in the car with the lost boy !
Because everyone's packets kept getting lost
Hi, Packetization delay is the difference in between end to end one way delay between selected packets in a flow with any lost packets.
Transport!
TCP does, not sure about others. TCP can handle out-of-order packets and lost packets. Even though TCP does some rudimentary error checking, corrupted packets sometimes get through.
Transport
PDV stands for packet delay variation. It is a term used in computer networking which is the difference in the end-to-end one-way delay between selected packets in any ignored lost packets.
TFTP needs to keep a copy of only the last packet it has sent, since the acknowledgement mechanism it implements guarantees that all the previous packets have been received, and thus will not need to be retransmitted.
The data structures that would go down when the router is reset or losses power would be the incoming packets, outgoing packets, and your log in details.