how to configure tftp server in cisco packet tracer

And also, what is the role of every command. I would like to know what commands should i enter on S1, S2, S3, S4 + on DG if i want to sync directly with the NTP Server and how would the config looks if i want to sync S1 with DG and S2, S3, S4 with S1 (so them would be stratum 4, S1 stratum 3, DG stratum 2). To all this things, how do i add NTP Authentication if i want to sync with DG, not directly with the server. Would i need to put default-gateways addresses on switch ? And if yes, for vlan 40 or 50 (management or native) ( i think managemnt so i can also config it remotely from another network) ? If i want to sync S1 directly with the server how do i procede ? I think i need to use a helper adress but i am not sure how. It will show you the steps required to : Configure Call Manager Express TM on a 2811 router, Use the various telephony devices. ' ? Would i need to make a VLAN Interface for VLAN 50 (Native vlan) or would i use VLAN 40 (Management VLAN). This tutorial is designed to help you to configure the voice over ip (voip) features available in Packet Tracer 8.1.1. But what would be the ip addres for 'ntp server. If you want to paste anything back into a switch or router config in Packet Tracer, go to the command prompt of the device, highlight & copy your desired config that is in Notepad, at the command prompt of. If i want to sync S1 with DG than i think i need to but 'ntp master 2 ' on DG to make it act as a NTP Master. As for copying & pasting, highlight the running-config, RIGHT mouse click and select copy, open notepad, paste it there. Then i went to configured S1 and here is where i got lost

Ntp authentication-key 5 md5 082F585E190E 7 (the hash would be 'ntppw')ntp authenticatentp trusted-key 5ntp server 10.1.0.10ntp master 2 *ntp update-calendar

How to configure tftp server in cisco packet tracer