Cisco CCNA OSI and TCP/IP Models Questions and Answers

Question 1

A network technician is troubleshooting an issue where a user can access local network resources but not websites on the internet.
The technician suspects a problem with logical addressing.
At which layer of the OSI model does this type of addressing occur?

Accepted Answer

Network Layer

Answer

Transport Layer

Answer

Data Link Layer

Answer

Application Layer

Question 2

Which of the following correctly identifies the Protocol Data Unit (PDU) at the OSI Transport Layer?

Accepted Answer

Segment

Answer

Packet

Answer

Frame

Answer

Bits

Question 3

A web browser uses the HTTP protocol to request a webpage. In the TCP/IP model, which layer is responsible for the functions performed by the Application, Presentation, and Session layers of the OSI model?

Accepted Answer

Application Layer

Answer

Internet Layer

Answer

Transport Layer

Answer

Network Access Layer

Question 4

During the data encapsulation process, which layer of the OSI model is responsible for adding a header that contains source and destination MAC addresses?

Accepted Answer

Data Link Layer

Answer

Network Layer

Answer

Physical Layer

Answer

Transport Layer

Question 5

A network administrator is configuring a multilayer switch to perform routing between VLANs. This device primarily operates at which two layers of the OSI model?

Accepted Answer

Layer 2 and Layer 3

Answer

Layer 1 and Layer 2

Answer

Layer 3 and Layer 4

Answer

Layer 4 and Layer 7

Question 6

Which statement accurately compares the TCP/IP model to the OSI model?

Accepted Answer

The OSI model is a reference model that provides guidelines, whereas the TCP/IP model is a protocol model that describes specific protocols.

Answer

The TCP/IP model is a theoretical reference model, while the OSI model is a practical implementation.

Answer

The TCP/IP model has more layers than the OSI model, providing greater detail.

Answer

The Network Access layer of the TCP/IP model maps directly to the Network layer of the OSI model.