Media Access Control (MAC) address is a globally unique identifier assigned to network devices. MAC addresses are 6-byte (48-bits) in length and are written in MM:MM:MM:SS:SS:SS format.

In telecommunications, a repeater is an electronic device that receives a signal and retransmits it at a higher level onto the other side of an obstruction, so that the signal can cover longer distances.

A local area network (LAN) is a computer network that interconnectscomputers within a limited area such as a residence, school, laboratory or office building.

Handshaking is a networking process where two computers establish a connection. Handshaking occurs when packets of data are exchanged between two computers.

Note: Handshaking is the action of exchanging standardized signals between devices in a computer network to regulate the transfer of data.

A transport layer provides end-to-end or host-to-host communication services for applications within a layered architecture of networkcomponents and protocols.

A peer-to-peer (P2P) network is created when two or more PCs are connected and share resources without going through a separate server computer. 

Note:- A P2P network can be an ad hoc connection—a couple of computers connected via a Universal Serial Bus to transfer files.

A device that connect to a network without the use of cables is said to be Wireless.

Note: A wireless network is any type of computer network that uses wireless data connections for connecting network nodes.

Asymmetric digital subscriber line (ADSL) is a type of digital subscriber line (DSL) technology, a data communications technology that enables faster data transmission over copper telephone linesthan a conventional voice band modem can provide.

NNTP (Network News Transfer Protocol) used to read and post new articles in news groups.

The Data Link layer resides above the Physical layer and below the Network layer.The Logical Link Control sublayer is responsible for synchronizing frames, error checking, and flow control.