is a hardware component that connects a computer or other device to a network, enabling it to send and receive data. It receives a data packet from the computer’s CPU, converts it into a format for the network (like serial data), adds headers with address information, also converts incoming serial data into a parallel format, removes the headers, and passes the complete packet to the CPU for processing.
Network Interface Card (NIC)
has a unique hardware/physical address. Each frame of Ethernet data identifies the source address and destination in fields header. Ex. 00:60:8c:12:3a:bc or 00608c123abc
media access control (MAC) address
is a numbering system often used to represent network addresses of different types. is a base-16 number system that uses digits (0)-(9) and letters A-F. It is widely used in computing to represent binary data more compactly, as each hexadecimal digit corresponds to exactly four binary digits (bits).
Hexadecimal
In most types of office cabling, the computer is connected to a wall port and—via cabling running through the walls—to it. Cables running through the walls are terminated to insulation displacement connector (IDC) punchdown blocks at the back and connected to wall port.
Patch Panel
A legacy simple hardware that connects multiple computers and devices on a local area network (LAN), broadcasting data to all connected devices.
Hub
is a network segment where data packets can collide if two or more devices try to transmit data at the same time. When a collision occurs, the devices must resend their data, which slows down the network.
collision domain
means that the computer can send or receive data, but not at
the same time.
Half-duplex
provisions one port for each device that needs to connect to the network. When it receives an incoming frame, it intelligently forwards it to the port that is a match for the destination MAC address. Has full duplex
switch
is a communication method that allows two devices to transmit and receive data simultaneously, unlike half-duplex (one direction at a time) or simplex (one-way only)
Full Duplex
an administrator can connect to it over a management port, configuring security settings, and choose options for the switch’s more advanced functionality.
managed switches
is a means of supplying electrical power from a switch port over ordinary data cabling to a powered device (PD), such as a voice over IP (VoIP) handset, camera, or wireless access point.
Power Over Ethernet (POE)