Communication Systems Revision Questions

What is meant by the process of encryption?

• Encoding of the data so it cannot be used by unauthorised users

• Manipulation of the data to make the transmitted or stored file smaller

• Encoding of the data so it is not allowed to be accessed by unauthorised users

• Manipulation of the data to make it easier to back up and restore the data when required

What is the name of the simplest device that connects two similar network topologies together?

• Bridge

• Gateway

• Router

• Server

Which of the following best describes the purpose of a modem?

• To connect a computer to a phone line

• To ensure that a digital transmission from a computer along phone lines is secure

• To direct the message or file from a computer to the correct DNS server for transmission to the correct node

• To modulate and demodulate the digital signal from the computer into an analogue form for transmission and back again

What name is given to this type of diagram?

• Funding management plan

• Data flow diagram

• Gantt chart

• Decision table

It is determined that the Windows and doors, Plumbing and Electrical can all be completed at the same time. If this occurs then what will be the duration of the whole project?

• 6.5 weeks

• 7 weeks

• 7.5 weeks

• 8 weeks

Mustgow High School is implementing a new attendance system. The new system is used to record absences for the maths department’s classes until detected problems have been fixed, and then the new system is implemented across the school.

What method of implementation is being used?

• Direct

• Parallel

• Pilot

• Phased

What is the main purpose of a developer using systems modelling tools (such as DFDs and data dictionaries)?

• To allow them to better understand the existing and proposed system and to document it for other members of the development team to refer to

• To allow them to conform to the expected standards of the company to ensure that the system is documented as expected

• To provide extra material for the training of participants in the new system, so they can see how it works

• To allow better communication with the development team and future clients to market the product better

Two network that use different protocols are to be joined, as shown in the diagram below. What device would be needed at A?

• Hub

• Switch

• Bridge

• Gateway

Describe the role of, and distinguish between, TCP and IP during the transmission of data across the internet.

Error checking is included in many communication protocols. Identify TWO common causes of errors during communication.