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Protocols
•Protocols are Set of rules - Understand what is requested from clients and servers , Defines what type of communication.
•Ex. http – web page, ftp – file server – upload and download, smtp – sending mail, pop3/imapv4 – receive mails , ntp – sync time , ldap – authentication, ssh/telnet/rdp – remote access,
Protocols Port No
•HTTP 80
•HTTPS 443 -- HTTP over SSL – ENCRYPT THE HTTP DATA
•FTP 20,21 – upload and download file
•SSH 22 --remote access with encryption
•TELNET 23 --remote access
•RDP 3389 --REMOTE DESKTOP
•SMTP 25 – send mail -out going mail
•POP3 110 – retrieve mail -incoming mail
•IMAPv4 143 – retrieve mail -incoming mail
•TFTP 69 --remote configuration, upload/down configuration files
•DHCP 67,68 --assign ip addresses to client automatically
•DNS 53 --gives ip address of the host/server(in domain) to client
•NTP 123 – sync time with time server ex. time.windows.com
•KERBEROS 88 --AUTHENTICATION, USED IN MICROSOFT ACTIVE DIRECTORY
•LDAP 389
•SNMP 161,162 --used in Monitoring , check system status
MySql – 3306
Oracle db TNS listener – 1521
Tomcat – 8080 – web server/application
Ports with numbers 0–1023 are called system or well-known ports; ports with numbers 1024-49151 are called user or registered ports, and ports with numbers 49152-65535 are called dynamic, private or ephemeral ports.
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