1. Cache method in Spark is used to enable the RDD persistence and distributed parallel processing on cluster computers.

A. True B. False

2. Which of the following is an incorrect statement?

A.In a centralised architecture, all or most data processing and computing processes are managed by the central servers.

B.In a decentralized architecture, servers are scattered in geographical areas with different centres undertaking different services.

C.In a distributed (peer-to-peer or P2P) architecture, nodes are working as either clients or servers, or both. D.In a hybrid architecture, nodes are connected to each other via virtual machines.

3. Load balancing is the process of finding overloaded nodes and then transferring the extra load to other nodes. Which of the following statements about the problems of load balancing is not true?

When a single data resource is demanded by an overwhelming number of clients, (i.e., a single data item is to be requested by many users).

When a destination Web Server is to be visited by too many clients.

When a server needs to maintain far too many incoming data streams

(upstream) or outgoing data streams (down streams) for file exchanges.

When a client is visiting a large number of servers over the Internet.

4. The strongest security is defined by the weakest link of a security chain.

A. True

B. False