The main advantage of using this is remote access on the network.
The entries specify four Telnet lines for remote access. Access will be permitted for Telnet using "c13c0" as the password
Password recovery
If you connect to the router via the console port then you are physically making a connection with a physical cable to the router. This implies you have to be close to the router itself. Using telnet allows you to connect to the router from anywhere in the network, and doesn't require a physical cable connection.
Internet browser.
If a switch is connected to a router then the MAC address of the router is known to the switch through that port. A host takes advantage of this by using the default gateway address (the address of the router) which the switch "knows" by its lookup table. Therefore, the switch can learn the address automatically and no configuration is necessary.
What is the purpose of using the copy tftp flash command on a router? to back up the current IOS image to a server to restore the IOS image from a server to back up the router configuration to a server to restore the router configuration from flash
In order for traffic to flow between VLANs a layer 3 device (router) is needed. Typically, in order to configure a router, you'll do so using the command line (CLI) through telnet or ssh or the local console or a web browser. Consequently, the configuration of a router happens at layer 7.
line vty
The Management IP address will be configured on the Default Management VLAN (vlan1). Make sure to do a "no shutdown" command on the VLAN as for it is placed into the shutdown state when first configured. Also for telnet you will need to configure the Virtual Terminal Lines just as a regular Cisco Router. If more functionality is needed other than Telnet more configuration maybe needed depending on what switch is being used.
VTY line mode
VTY line mode
Usually modems do not require any configuration. But your router has to configures to get external IP from a DHCP server or whatever your internet provider is using.