Chapter 4 Information systems operations, maintenance and service management

Question 1

what are the components for LAN?

Answer 1

1. Repeaters: extend the network, connect network segments together
2. hubs: physical connection devices
3. bridges: connect lan segments or enture LANs to each other
4. switches: devide, separate and interconnect network segments
5. routers: see switches above

Question 2

What are the normalisation rules in a relational database?

Answer 2

Normalisation is the elimination of the redundant data.

1. For each instance of the data object there can only be one value for each attribute;
2. The attributes represent elemmentary items, that is, they contain no parts.
3. Each tuple has a primary key may have attribute values that further describe the item