The Open Systems Interconnection (OSI) model — Quiz

The Open Systems Interconnection (OSI) model

1. At which layer of the OSI model would you find protocols like TCP and UDP, which are responsible for service-to-service delivery between applications? (Choose one answer)

a) Network Layer

b) Data Link Layer

c) Transport Layer

d) Application Layer

2. A network switch that makes forwarding decisions based on MAC addresses operates primarily at which OSI model layer? (Choose one answer)

a) Physical Layer (Layer 1)

b) Data Link Layer (Layer 2)

c) Network Layer (Layer 3)

d) Transport Layer (Layer 4)

3. The process of adding headers (and sometimes trailers) to data as it moves down the OSI model stack is known as (Choose one answer)

a) De-encapsulation

b) Segmentation

c) Encapsulation

d) Encoding

4. During the data encapsulation process, which term describes the construct created when a Layer 3 header is added to a segment? (Choose one answer)

a) Frame

b) Packet

c) Segment

d) Data

5. A client web browser initiates a request to a server. Which of the following best describes how the source and destination port numbers are used in this communication? (Choose one answer)

a) The source port is a well-known port (like 80), and the destination port is randomly selected by the client

b) Both the source and destination ports are well-known ports defined by the application

c) The destination port is a well-known port (like 80 for HTTP), and the source port is randomly selected by the client

d) The source and destination ports are both randomly selected for the duration of the session