Networking Questions

When hierarchical routing is used, the routers are divided into what we call regions, with each router knowing all the details about how to route packets to destinations within its own region, but knowing nothing about the internal structure of other regions

It is a host that has a multiple network interfaces and that requires multiple IP addresses is called as a Multi-homed Host

It is a system that performs a protocol translation between different electronic mail delivery protocols

In Computers ::

A network is a collection of computers, servers, mainframes, network devices, peripherals, or other devices connected to one another to allow the sharing of data.

An excellent example of a network is the Internet, which connects millions of people all over the world. Below is an example image of a home network with multiple computers and other network devices all connected to each other and the Internet.

Ex:: LAN, WAN, MAN, WLAN,...

In Business view::

Networking is defined as the act of making contact and exchanging information with other people, groups and institutions to develop mutually beneficial relationships.

It is a sequence of IP addresses identifying the route a datagram must follow. A source route may optionally be included in an IP datagram header

MAC - Media Access Control, address is a globally unique identifier assigned to network devices, and therefore it is often referred to as hardware or physical address.

MAC addresses are 6-byte (48-bits) in length, and are written in MM:MM:MM:SS:SS:SS format.

Sending a message to a group is called multicasting, and its routing algorithm is called multicast routing

There are two IP address assigned to each device on a Wi-Fi network.

An Internal (Private) and an External (Public) IP address.

Internal IP address is used for communication between Your computer and a smartphone or whatever devices that are connected to that Wifi network. This is unique for each. If they are same the system cannot differentiate between each device.

While, the External IP address is that visible to the the internet - the websites, the internet connected Apps so on. By default, Routers with NAT (all routers today have it) assign same Public IP address to all devices under its network.