$.$ Repeat the steps in Part $1$ to create DNS traffic.

b$.$ In the Simulation Panel, change Edit Filters to display only DNS and UDP.

c$.$ Click the PDU envelope to open it$.$

d$.$ Look at the OSI Model details for the outbound PDU.

Question:

What is the Layer $4$ protocol?

Are these communications considered to be reliable?

e$.$ Open the Outbound PDU Details tab and find the UDP section of the PDU formats. Record the SRC PORT and DEST PORT values.

Question:

Why are there no sequence and acknowledgement numbers?

f$.$ Close the PDU and click Capture$/$Forward until a PDU with a check mark returns to the DNS Client.

g$.$ Click the PDU envelope and select Inbound PDU Details.

Question:

How are the port and sequence numbers different than before?

What is the last section of the PDU called? What is the IP address for the name multiserver.pt$.$ptu?