Year 14 DT - OSI Model

Why are communication protocols necessary?

• To make devices faster

• To enable different devices to communicate coherently

• To store digital messages

• To improve hardware performance

Which of the following is NOT typically covered by communication protocols?

• Authentication

• Error detection and correction

• Signaling

• File compression software

True or False: Computer networks could still exist without communication protocols

• True

• False

The World Wide Web Consortium (W3C) develops protocols and guidelines to:

• Replace the internet

• Ensure long-term growth of the web

• Encrypt all communication

• Build physical networking devices

In the OSI model, how many layers exist?

• 5

• 6

• 7

• 8

Which OSI layer is responsible for encryption and data format conversion?

• Session

• Presentation

• Transport

• Network

Which layer is responsible for error detection and correction, as well as turning packets into bits?

• Physical

• Network

• Data Link

• Transport

The Transport layer is responsible for:

• Choosing the best route for data packets

• Converting bits into physical signals

• Dividing information into packets and reassembling them

• Opening sessions between devices

Which layer attaches the destination IP address to each packet?

• Application

• Data Link

• Network

• Physical

Match the OSI layer with its role:

(a)   : Opens and manages connections between devices