2. Written Lab : The Open Systems Interconnection Specifications

Question 1

Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coördinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?

Answer 1

The Application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses).

Question 1

Which layer is responsible for converting frames from the Data Link layer into electrical signals?

Answer 1

The Physical layer takes frames from the Data Link layer and encodes the 1s and 0s into a digital signal for transmission on the network medium.

Question 2

At wich layer is routing implemented, enabling connections and path selection between two end systems?

Answer 2

The Network layer provides routing through an internetwork and logical addressing.

Question 3

Which layer defines how data is formatted, presented, encoded, and converted?

Answer 3

The Presentation layer makes sure that the data is in a readable format for the Application layer.

Question 4

Which layer is responsible for creating, managing, and terminating sessions between applications?

Answer 4

The Session layer sets up, maintain, and terminates sessions between applications.

Question 5

Which layer manages the transmission of data across a physical link and is primarily concerned with physical addressing and the ordered delivery of frames?

Answer 5

Protocol data units (PDUs) at the Data Link layer are called frames. As soon as you see the word frame and/or the term physical addressing in a question, you know the answer is allways Data Link layer.

Question 6

Which layer is used for reliable communication between end nodes over the network and provides mechanism for establishing, maintaining, and terminating virtual circuits as well as controlling the flow of information?

Answer 6

The Transport layer uses virtual circuits to create a reliable connection between two hosts.

Question 7

Which layer provides logical addressing that routers use for path determination?

Answer 7

The Network layer provides logical addressing, IP and/or IPv6 addressing, and routing.

Question 8

Which layer specifies voltage, wire speed, and connector pin-outs and moves bits between devices.

Answer 8

The Physical layer is responsible for the electrical and mechanical connections between devices.

Question 9

Which layer combines bits into bytes and bytes into frames and uses MAC addressing.

Answer 9

The Data Link layer is responsible for the framing of data packets.