lab UDP

  The AssignmentStart capturing packets in Wireshark and then do something that will cause your host tosend and receive several UDP packets After stopping packet capture, set your packetfilter so that Wireshark only displays the UDP packets sent and received at your hostPick one of these UDP packets and expand the UDP fields in the details window1 Select one packet From this packet, determine how many fields there are in theUDP header (Do not look in the textbook! Answer these questions directly fromwhat you observe in the packet trace) Name these fields There is 4 fields :i)Source portii)Destination portiii)Lengthiv)Checksum 2 From the packet content field, determine the length (in bytes) of each of the UDPheader fieldsi)  Source port: 2 bytes ii) Destination port: 2 bytes iii) Length: 2 bytesiv) Checksum: 2 bytes  3 The value in the Length field is the length of what? Verify your claim with your captured UDP packet Length field is is a simple count of the number of bytes contained in the headerand data sections The length of this UDP packet is 45 bytes 4 What is the maximum number of bytes that can be included in a UDP payload UDP datagrams can be up to 65535 bytes long (header + payload) 5 What is the largest possible source port number? The largest possible source port number is 65535 6 What is the protocol number for UDP? Give your answer in both hexadecimal anddecimal notation (To answer this question, you’ll need to look into the IPheader) Hexadecimal= 0x11Decimal= 16 1 + 16 0 = 16+1= 17 7 Search “UDP” in Google and determine the fields over which the UDP checksum  is calculated To calculate UDP checksum a "pseudo header" is added to the UDP header Thisincludes:IP Source Address 4 bytesIP Destination Address4 bytesProtocol2 bytesUDP Length 2 bytesThe checksum is calculated over all the octets of the pseudo header, UDP headerand   data   If the data contains an odd number of octets a pad, zero octet is addedto the end of data The pseudo header and the pad are not transmitted with thepacket 8 Examine a pair of UDP packets in which the first packet is sent by your host andthe second packet is a reply to the first packet Describe the relationship betweenthe port numbers in the two packets First packet source port is 3604 and destination port is 712Second packet source port is 712 and destination port is 3604 Extra Credit