TCP port 23
Telnet is similar to HTTP and FTP in that all three use the TCP protocol for connection-oriented
Telnet is a Network layer protocol. It is used to create connection remotely.
Telnet does not encrypt anything; that is why it is too insecure to use as a network protocol.
what osi layers use telnet connections for remote use
Telnet- is an application layer program that enables a user to remotely login and use resources of a remote computer.
Telnet
Network Control Protocol is uses to identify the Network layer protocol used in the packet
HTTPS is not a separate protocol, but refers to use of ordinary HTTP over an encrypted Secure Sockets Layer (SSL) or Transport Layer Security (TLS) connection. So it really does not have a place per say, because it's not a protocol it's a hybrid. Or you can say it originates in the Application layer and then finishes in the Presentation layer.
1.application: e-mail application-layer protocol: SMTP [RFC 2821] 2.application: WEB application-layer protocol: HTTP [RFC 2616] 3.application: streaming multimedia application-layer protocol: HTTP (eg Youtobe), RTP [RFC 1889] 4.application:file transfer application-layer protocol: FTP [RFC 959] 5.application: remote terminal access application-layer protocol: Tenet [RFC 854]
Yes, you can, but this is a very dangerous thing to do. Firstly, telnet is an insecure protocol, and anyone with a packet sniffer can find out your root password. Secondly, one should really never log in as the root account; use su or sudo after logging in as an ordinary user using a more secure protocol such as ssh. There are some settings in some versions of telnet that may prevent root logins, but the standard telnet will allow that.
Telnet can be used to get into certain routers and other devices in the network. This will aid in the troubleshooting process because the devices support that protocol but it should be noted that it is a very insecure protocol and should never be used from outside the network to the inside of the network.
Port 23 is the traditional port used for Telnet. Telnet is basically a protocol to allow a user to connect to another computer or server in order to view information or log in. When this port is open, it is often an indication that a malicious piece of software has planted a backdoor in your computer to allow other users to access it without your permission.