A Local Area Network ( Lan )

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A local area network (LAN) is a computer network that connects computers in an area with limited space such as a home, school, computer laboratory, or office building, using network media.
A Wide Area Network, or WAN, is made up of many computer networks connected together, often over the Internet. In most cases, the networks in WANs all belong to the same company or school.
A Metropolitan area network, or MAN for short, is a computer network that connects multiple other Local area networks (LANs). An example of where MANs are used, are the networks on a campus of a university. MANs use different technologies than LANs.
The 5-4-3 rule, also known as the IEEE way, is a design guideline for computer networks using Ethernet, covering the number of repeaters and segments on shared-access Ethernet backbones in a tree topology.
Depending on the protocols they need to support, packets tend to be constructed in the standard packet format. Packet formats generally include a header, the body containing the message data, also known as the payload, and sometimes a footer which is also known as the trailer. The packet header shows the destination of the packet and often shows the length of the data in the message. The packet footer contains data that implies the end of the packet, such as a special sequence of bits known as a magic number. The packet header and the packet footer may contain error-checking information.
A DNS lookup, in a general sense, is the process in which a DNS record

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