OCR A - Level Computer Science (H446) - Unit 5: Networks and web technologies EXAM QUESTIONS AND ANSWERS 100% CORRECT!

- System redundancy - Backups - Fail-over systems (these systems detect errors and anomalies and move processes over to an alternative system) - Disaster Recovery Plan What are the disadvantages of a private network? - ANSWER - Require a team of specialist staff to maintain the network - Downtime must be kept to a minimum and various methods are used to ensure any risks are minimized. What does an Network Interface Card do? - ANSWER These circuits use Ethernet connections in order to transmit and receive data. Modern day computers mostly have these circuits built directly into their motherboards. What is a router and what does it do? - ANSWER This device provides a means of connecting networks. It receives data packets from one network and using the address in the packet, it can forward the packet on to the correct network. This device determines where to send packets according to a table of neighboring networks or using an algorithm to determine the most efficient step for the packet. What are Wireless Access Points? - ANSWER These enable wireless devices to connect to a network temporarily. Connections can be made from approximately 100 meters away, which can cause concern over signal interception How does an individual avoid being attacked on a WAP? - ANSWER - Hiding the SSID (prevents the WAP from being seen by other users) - Encryption (signals can be encrypted) - Limit Access (WAPs can be configured to accept communications from certain MAC addresses) What is the Bus topology? - ANSWER A bus network uses a common backbone, where each device is connected. It is limited in size as the backbone is typically made of copper, which suffers from attenuation (signal weakening) over a distance. If one component fails (i.e. one computer is disconnected) of the backbone, the whole network wil