Table of Contents
What protocol sends email over a TCP IP network?
SMTP
What is SMTP? SMTP is part of the application layer of the TCP/IP protocol. Using a process called “store and forward,” SMTP moves your email on and across networks. It works closely with something called the Mail Transfer Agent (MTA) to send your communication to the right computer and email inbox.
What is tcpip port?
A port is a number used to uniquely identify a transaction over a network by specifying both the host, and the service. They are necessary to differentiate between many different IP services, such as web service (HTTP), mail service (SMTP), and file transfer (FTP).
What is the default port for TCP?
TCP Ports 80 and 443 Arguably the single most famous port on the Internet, TCP port 80 is the default that HyperText Transfer Protocol Web servers listen on for Web browser requests.
What is the default ports of provides connections to computers over a TCP IP network?
Worksheet 1522 Protocols
| Protocol Definition | Protocol | Default Port(s) |
|---|---|---|
| Provides connections to computers over a TCP/IP network | SSH/Telnet | 22/23 |
| Sends e-mail over a TCP/IP network | SMTP | 25 |
| Translates URLs to IP address | DNS | 53 |
| Transports web pages over a TCP/IP network | HTTP | 80 |
Is email UDP or TCP?
Email Protocols All three use TCP, and the last two are used for accessing electronic mailboxes. Special records stored in DNS servers play a role as well, using UDP. The current version of POP is version 3 (POP3) and the current version of IMAP is version 4 (IMAP4).
What is the SMTP port?
port 25
Ports. Communication between mail servers generally uses the standard TCP port 25 designated for SMTP.
What is port 135 commonly used for?
Port 135 is used for RPC client-server communication; ports 139 and 445 are used for authentication and file sharing. UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.
What is TCP 23?
Port 23 is typically used by the Telnet protocol. Telnet commonly provides remote access to a variety of communications systems. Telnet is also often used for remote maintenance of many networking communications devices including routers and switches.
Is port 443 TCP or UDP?
Port 443 Details
| Port(s) | Protocol | Service |
|---|---|---|
| 443 | tcp,udp | |
| 443 | tcp | trojan |
| 443 | tcp | https |
| 443,1024-5000,5190 | tcp,udp | applications |
What are ports 110 and 443 used for?
TCP port 110 is used for POP3 but POP3 is only used for incoming email, not outgoing email. TCP port 443 is used for HTTPS, not email.
What is the default FTP port number?
port 21
FTP communications use two port number values – one for commands (port 21 by default) and one for data transfer (this is where the PORT command comes into play). The PORT command is sent by an FTP client to establish a secondary connection (address and port) for data to travel over.
What port is FTP?
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port.