The League English Classes Interview Questions and Answers

A port number is a communication endpoint in networking. Public ports are accessible from the internet, while private ports are only accessible within a local network.

• Port numbers range from 0 to 65535 and are used to identify different services or processes on a network.

• Public ports are exposed to the internet and allow external communication, like port 80 for HTTP.

• Private ports are used for internal communication within a network, like port 22 for SSH.

• Port numbers help dire...read more

DHCP stands for Dynamic Host Configuration Protocol. It is used to automatically assign IP addresses to devices on a network.

• DHCP is used to assign IP addresses, subnet masks, default gateways, and DNS servers to devices on a network.

• DHCP servers are typically configured on routers, switches, or dedicated DHCP servers.

• DHCP configuration involves setting up a range of IP addresses that can be assigned, lease durations, and other network settings.

• DHCP can also be configured on ...read more

To check public IP Address in a network, use online tools, command line tools, or network devices.

• Use online tools like 'WhatIsMyIP.com' or 'IPChicken.com'

• Use command line tools like 'ipconfig' on Windows or 'ifconfig' on Linux

• Check network devices such as routers or firewalls for public IP address

VLAN stands for Virtual Local Area Network. It is a network of computers that behave as if they are connected to the same switch, even if they are not physically located on the same network switch.

• VLANs are used to segment network traffic and improve network performance and security.

• They are configured on network switches or routers.

• VLAN configuration involves assigning ports to specific VLANs and setting up VLAN trunks for inter-VLAN communication.

• Examples of VLAN configurat...read more

Access to remote router can be obtained through secure methods like SSH or VPN.

• Use SSH (Secure Shell) to remotely access the router

• Set up a VPN (Virtual Private Network) connection to access the router securely

• Ensure proper authentication and authorization protocols are in place

DDNS stands for Dynamic Domain Name System. It is used to automatically update the IP address linked to a domain name.

• DDNS allows a device with a changing IP address to have a consistent domain name.

• It is commonly used for remote access applications like VPNs or security cameras.

• DDNS services periodically update the IP address associated with a domain name.

• Examples of DDNS providers include No-IP, DynDNS, and DuckDNS.