Karteikarten
ICT -Networks
Karten in diesem Stapel (17)
- 1ModemsModem is a device that converts a computer's digital signal into an analogue signal for transmission over an existing telephone line. It can also do the reverse process to enable the computer to process the data.
- 2HubsHubs are hardware devices that can have a number of devices or computers connected to them. They are often used to connect together a number of devices to form a LAN (local area network.)
- 3SwitchesSwitches are similar to hubs but are more efficient in the way that they distribute data packets. The switch checks the data packet received and works out its destination address and sends the data to the appropriate computer only. This makes the switch a more secure way of distributing data.
- 4BridgeBridges are devices that connect one LAN to another LAN uses the same protocol (communication rules.) They are often used to connect together different parts of a LAN so that they can function as a single LAN.
- 5RouterRouters enable data packets to be routed between the different networks, for example to join a LAN to a wide area network (WAN). A router would have an internet cable plugged into it and several cables connecting to computers and other Devices on the LAN.
- 6Data PacketsThe data is carried in the packet according to which protocol (set of rules) is used. Packets of data usually contain the following information:
*some form of header to identify the data packets
* The sender's IP address
*The receiver's IP address
*How many data packets make up the whole "message"
*the identity number of each packet - 7GatewayA gateway is a network point (or node) that acts as an entrance to another network. It is a key point for data on its way to or from other networks. If a network node needs to communicate outside its network, it needs to use a gateway.
- 8Network Interface Card (NIC)A network interface card is needed to allow a device to connect to a network (for example the internet.) It is usually part of the device hardware and frequently contains MAC address generated at the manufacturing stage.
- 9Network CablesEven though many computer systems use WiFi, network cables are still used because they have the following advantages over WiFi:
*Fast data transfer rates
*can be more secure than wireless networks. - 10Internal protocol (IP) and media access control (MAC) addressesEach device on the internet is given a unique address known as its internet protocol address. This is a 32-bit number that is usually written in the form: 109.108.158.1
- 11Differences between IP and MAC addressesa MAC address is a unique number that identifies a device connected to the internet. The IP address gives the location of a device on the internet, whereas the MAC address identifies the device connected to the internet.
- 12WiFi and bluetoothboth WiFi and bluetooth offer wireless communication between devices. They both use radio frequencies as the carrier of data transmission.
- 13How computers use WiFi to connect to networksA wireless transmitter (WAP) receives information from a network via its connection. This transmitter converts the received information into radio waves and then transmits them.
- 14How computers use Bluetooth to connect to networksBluetooth sends and receives radio waves in a band of 79 different frequencies (known as channels.) Devices using bluetooth automatically detect and connect to each other, but they don't interfere with other devices since each communicating pair uses a different channel.
- 15How to set up and configure a small network*setting up an IP account if internet access is required
*setting up the system (or buying appropriate hardware correctly configured) to allow for wireless connectivity
*configuring all the hardware and software so that they work correctly together
*if internet is required, ensuring that a high-speed broadband connection exists
*putting all the common software onto a server and also making sure that a network licence has been acquired so that all network users can make use of the software
*setting up a network -manager-level of privilege do that they can monitor network usage, change passwords etc. - 16Local Area Networks (LANs)These systems are usually within one building, or certainly not very far away from each other geographically. A typical LAN will consist of a number of computers and devices (for example printers) that are connected to hubs or switches. one of the hubs or switches will be connected to a router or modem. To allow the LAN connect to the internet; in doing so it then becomes part of a WAN.
- 17—
Informationen
- Beschreibung
- Karteikarten am ICT -Networks , erstellt von Zena Zarnaji am 20/03/2018.
- Erstellt von
- Zena Zarnaji
- Aufrufe
- 0
- Bewertung
Mehr zu Network Hardware and Devices