PC D$$connects to PC A$$using IMAP $($non$-$SSL connection$).$

Which protocol is used at layer $4?$

For the packet sourced from PC D$$and destined to PC A:

On R$1,$ what is the inbound interface?

On R$1,$ what is the outbound interface?

Complete the IP$/$TCP$/$UDP header information for the packet from PC D$$destined to PC A$($If an address or port is random,$$just enter "random" without quotes$)$:

Source IP AddressDestination IP AddressSource TCP$/$UDP PortDestination TCP$/$UDP Port$$

For the return packet sourced from PC A$$and destined to PC D:

On R$2,$what is the inbound interface?$$

On R$2,$what is the outbound interface?$$

Complete the IP$/$TCP$/$UDP header information for the packet from PC A$$destined to PC D$($If an address or port is random,$$just enter$"$random$"$without quotes$)$:

Source IP AddressDestination IP AddressSource TCP$/$UDP PortDestination TCP$/$UDP Port