COM port is used to configure a router but you can also get a COM port to USB port adapter which can configure a router using a USB port.
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To configure a VLAN on a switch port, first access the switch's command-line interface (CLI) via console or SSH. Enter configuration mode by typing configure terminal, then select the specific interface using interface [type][number] (e.g., interface FastEthernet0/1). Assign the VLAN to the port with the command switchport access vlan [VLAN_ID], and if needed, set the port to access mode using switchport mode access. Finally, save the configuration with write memory or copy running-config startup-config.
it means that the port that you are using is not forwarded trough your routeruse google or even youtube and search on how to port forward
configure pheripheral devices
To be able to forward ports you need to know which port and which IP address to forward it to. This is a function of a router, not the modem. Therefore, you would need access to their router.
If you are using windows the go to ->control panel -> windows security -> disable your selected port. or your can disable this port by configure your modem contact your operator.
The answer to this question depends entirely on the web server software you are using. Generally, however, there is a configuration setting that controls the port number. Check the manual or configuration files for the exact place to change the port number.
Yes, there should be, but it would vary depending on the security features of the switch port - google "switchport port-security" for examples. Once this is set, the switch won't forward packets to addresses outside of the specified range.
It depends on what you are trying to accomplish, but in general, you can't. You need to talk to your neighbor.
Depends on the OS (operating system)
Windows Vista does not provide a Telnet server. The instructions on how to change the port the server runs on will vary by software package. Without knowing what package you are using to provide Telnet, we can't provide instructions on how to configure it.