Unit 4: Networks and the effects of using them. (4.1 Networks (network…
Unit 4: Networks and the effects of using them.
converts a computer's digital signal into an analogue signal for transmission over an existing telephone line.and vice versa
connect together a number of devices to form a LAN
similar to hubs but checks the data packet received and works out its destination and sends the data to appropriate computers only; more secure.
connect one LAN to another LAN
Joins LAN TO WAN
a network point that acts as an entrance to another network
network interface cards
allow a device to connect to a network
-Faster data transfer rates
-can be more secure
internet protocol (IP) and media access control (MAC) addresses
each device on the internet is given a unique address (IP) address. this is a 32-bit number written in the form
the IP address gives the location of a device on the Internet, whereas the MAC address identifies the device connected to the Internet.
WI-Fi and Bluetooth
How to set up and configure a small network
-setting up an IP account if internet access is required
-setting up the system to allow wireless connectivity
-configuring all the hardware and software so they work correctly together
-if Internet is required, ensuring that a high-speed broadband connection exists
-putting all the common software into a server and also making sure that network license has been acquired so all network users can make use of the software
-setting up previledges so each user can only access their own area
-setting up a network managed level of privilege so they can monitor network usage.
Internet, intranets and extranets
(LANs) and (WANs)
(LANs): within 1 building, made of a number of computers and devices connected to hubs/switches, one of the hubs or switches will be connected to a router or modem (broadband) to allow LAN to connect to the Internet so It becomes a part of a WAN
computers/networks situated a long distance from each other geographically.
similar to LANs but without wires
Accessing the Internet
Mobile phones and tablets
4.2 network issues and communication
Should internet be policed?
Inappropriate sites and the accuracy of information
Reliability of information
Undesirability of certain websites
Avoiding viruses when accessing the Internet
Viruses from hardware devices
Data protection acts
Faces and emails
Physical fax: dedicated machine connected to a telephone line; it requires the number of the recipient to be dialed before the document is copied and then sent electronically
Electronic faxing: requires a network such as the internet for the fax to be sent
Emails: useful when sending attachments
Business meetings to discuss new ideas