Question: When sending packets from source to destination, is the transport layer protocol used or activated in the routers as the packets pass through the network

When sending packets from source to destination, is the transport layer protocol used or activated in the routers as the packets pass through the network core? Why yes or no? a. b. Why might an application developer choose to use UDP over TCP? c. Why do you think HTTP and SMTP use TCP? d. Why does DNS use UDP initially

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