Network + Lesson 1

Which OSI reference model layer is responsible for the following?

Setting up session

• Maintaining a session

• Tearing down a session

• Presentation layer (Layer 6)

• Data link layer (Layer 2)

• Session layer (Layer 5)

• Transport layer (Layer 4)

Examine the devices in the following exhibit. What OSI layer do devices A and B function at?

• Device A is a Transport layer switch, and device B is a Network layer bridge.

• Device A is a Data Link layer switch, and device B is a Network layer router.

• Device A is a Physical Layer switch, and device B is an Application layer server.

• Device A is a Network Layer router, and device B is a Data Link Layer switch.

What is the protocol of the address used by a router (at Layer 3) to identify specific devices?

• MAC

• IP

• LLC

• ARP

Which of the following layers of the OSI reference model is primarily concerned with forwarding data based on logical addresses?

• Physical Layer
• Data Link Layer
• Network Layer
• Transport Layer

What happens to data as it moves from the upper layers to the lower layers of the OSI model on a host system?

• The header and trailer are stripped off through encapsulation.

• The data is encapsulated with a header at the beginning and a trailer at the end.

• The header and trailer are stripped off through decapsulation.

• The data is sent in groups of segments that require two acknowledgments.

A router resides at which layer of the OSI Model?

• Layer 1

• Layer 2

• Layer 3

• Layer 4

Which of the following is a connectionless network layer protocol?

• IP

• TCP

• UDP

• SFTP

What is the range of well-known TCP and UDP ports?

• 0–2048

• 0–1023

• 16,384–32,768

• 8192–62,354

Which of the following correctly describes encapsulation as opposed to decapsulation?

• The data moves from the physical layer to the application layer.

• A header is added at the beginning of a packet.

• The frame header and trailer are stripped off.

• The packets are sent to the transport to be reassembled.

• A port number is identified, and the data is associated with an application.

A corporate e-mail service would be classified as belonging to which layer of the OSI Model?

• Presentation

• Physical

• Application

• Network