How many layers does the OSI model consist of?

Seven layers

True or False: A simplex channel allows data to flow in both directions simultaneously.

False. 

A simplex channel allows data to flow in only one direction.

What is the primary function of a modem in a data communication system?

To convert digital signals to analog signals and vice versa for communication over telephone lines.

Fill in the blank: Data communication involves the exchange of ___ between two devices via a transmission medium.

Data

Which network topology connects all nodes to a central node that re-broadcasts transmissions?

Star topology

True or False: Ethernet technology primarily uses wireless signals for communication.

False. 

Ethernet technology primarily uses wired connections, such as coaxial or twisted pair cables.

Fill in the blank: A gateway’s primary function is to convert ___ from one protocol to another.

Packets

What are the three main types of communication channels based on the direction of data flow?

Simplex, Half Duplex, and Full Duplex

True or False: Guided media refers to wireless technologies used for data transmission.

False. 

Guided media refers to wired technologies that guide signals along a physical path.

Fill in the blank: In a half duplex channel, data can flow in both directions, but not ___.

Simultaneously

What is the role of a file server in a computer network?

To provide access to files and enable users to share programs and data over a local area network (LAN).

What defines a Local Area Network (LAN) in terms of its scope and connectivity?

A LAN connects devices over a short distance, typically within a single site like a home, office, or school.