Network Components (Devices)

A computer that gains itself of the services provided by servers.

• Cable
• Server
• Client
• Mainframe

A device that amplifies a signal as it passes through it to counteract the effects of attenuation.

• Server
• Client
• Cable
• Repeater

Is an electronic device that connects to the Internet via an ISP (Internet Service Provider). It converts digital data to analog signals for transmission over a phone line.

• Modem
• Hub
• Repeater
• Switch

A Network device has two ports. It splits one network to two networks to decrease the number of collisions or it connects 2 networks to one network.
It uses the MAC address to take the decision for forwarding the packets.

• Switch 
• Hub
• Bridge
• Router

Devices that connect entire networks to each other.
They use IP addresses to forward packets to other networks.
They contain tables of IP addresses along with optimal routes to other networks.

• Switches
• Routers
• Hubs
• Bridges

Provide network access to wireless devices such as laptops and PDAs.
Use radio waves to communicate with radios in computers, PDAs, and other wireless devices.
Have limited range of coverage.

• Routers
• WAP
• Switches
• Servers

A device that connects the internal networks and the outside network (Internet). In such a situation, it  could also act as a proxy server and a firewall. 

• Gateway
• Switch
• Repeater
• Hub

It is a network security system that controls the incoming and outgoing network traffic based on an applied rule set
It establishes a barrier between a trusted, secure internal network and another network (e.g., the Internet) that is assumed not to be secure and trusted. 
It exists both as a software solution and as a hardware appliance.

• Hub
• Firewall
• Client
• Repeater

A network device that transfers small amounts of DC current over Ethernet cable, along with data, to power other network devices such as Wi-Fi access points.

• WAP
• NIC
• POE
• EAP

POE is abbreviation for :

• Power Over Ethernet 
• Power on Edge
• Pass Over Enternal
• -----