What application protocol is in use in this capture?

• 200-201 : All Parts

The application protocol is not DHCP. Were that the case, the destination port numbers in the details section would be 67 and 68.

DNS is not the protocol in use. Were it in use, the destination port number in the details section would be 53.

If SSL were the application protocol, the destination would have been port 443.

You should be familiar with the following common protocols and their ports:

– FTP 20,21
– SSH, SFTP 22
– TELNET 23
– SMTP 25
– DNS 53
– DHCP 67,68
– TFTP 69
– HTTP 80
– POP3 110
– NTP 123
– NetBIOS 137, 139
– IMAP 143
– SNMP 161
– LDAP 389
– SSL and HTTPS 443
– LDAPS 636
– MS SQL Server 1433