Computer Networking: Pract. Lecture #4 & #5:Loopback adapter-Telnet protocol

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Configuring the Router using telnet protocol
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The idea from creating loopback adapter is to connect the real machine as network device or a host within GNS3 topology

the Application layer uses protocols that are implemented within applications and services

All three components may be used by a single executable program and may even use the same name. For example,
when discussing "Telnet" we could be referring to the application, the service, or the protocol.

There are several ways to access the CLI environment. The most usual methods are:
-Console
-Telnet or SSH
-AUX port

Telnet, a terminal emulation protocol, is used to provide remote access to servers, and networking devices (routers, switches)
To support Telnet client connections, the server runs a service called the Telnet daemon.
The vty lines allow access to a router via Telnet. By default, many Cisco devices support five VTY lines that are numbered 0 to 4. A password needs to be set for all available vty lines. The same password can be set for all connections.

While the Telnet protocol supports user authentication, it does not support the transport of encrypted data. All data exchanged during a Telnet sessions is transported as plain text across the network. This means that the data can be intercepted and easily understood.
If security is a concern, the Secure Shell (SSH) protocol offers an alternate and secure method for server access. SSH provides the structure for secure remote login and other secure network services. It also provides stronger authentication than Telnet and supports the transport of session data using encryption. As a best practice, network professionals should always use SSH in place of Telnet, whenever possible.

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