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10.4 TCP vs. UDP
9/12/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/10/pages/4 1/2 TCP vs. UDP Section 10: Understanding TCP/IP Transport Layer The postal service has been used as an analogy to illustrate the differences between connectionoriented TCP and connectionless services that are provided by UDP. Example: TCP—Sending Certified Mail Imagine that you are a popular author in Seattle. Your editor in Indianapolis is very anxious to publish your next novel and demands that you mail her each page as you finish one. You print each page of the book as you write them and put each page in a separate envelope. To ensure that your editor reassembles the book correctly, you put a page number on each envelope (a sequence number). You address the envelope and send the first one as certified mail. The postal service delivers it by any truck and any route but, because it is certified, the carrier who delivers it must get a signature from your editor and return a certificate of delivery to you. Your contract with the publisher specifies that each page must be in a separate envelope. But having to go to the post office to send each letter individually is too time consuming, so you send several envelopes together. The postal service again delivers each envelope by any truck and any route. Your editor signs a separate receipt for each envelope in the batch as she receives them. If one envelope is lost in transit, you will not receive a certificate of delivery for that numbered envelope, and you will need to resend that page. As your editor is receiving your envelopes, she uses the sequence numbers to assemble the book in the proper order. Like certified mail, TCP offers sequencing, acknowledgements, and retransmission. 9/12/2016 Cisco ELearning for ICND1 v2.0 https://ondemandelearning.cisco.com/ciscosc/icnd1#/sections/10/pages/4 2/2 Example: UDP—Sending Regular Mail UDP services can be compared to using the postal service to pay your bills. You address each bill payment to a specific company address, stamp the envelope, and include your return address. The postal service guarantees its best effort to deliver each payment. The postal service does not guarantee delivery, and it is not responsible for telling you that delivery was successful or unsuccessful. Like standard mail, UDP is a simple process that provides basic datatransfer services. Up Next: TCP Characteristics