CCST OSI and TCP/IP Models 3

Question 1

What is encapsulation in the OSI model?

Accepted Answer

Adding protocol headers and trailers at each layer as data moves down the stack

Answer

Encapsulation adds layer-specific control information at each layer going down the stack.

Question 2

Which OSI layer provides end-to-end flow control and reliable delivery?

Accepted Answer

Transport

Answer

The Transport Layer (Layer 4) provides end-to-end flow control, error recovery, and reliable delivery via TCP.

Question 3

What role does the Physical Layer play in network communication?

Accepted Answer

Converts data frames into physical signals for transmission over the medium

Answer

The Physical Layer (Layer 1) converts digital data into physical signals (electrical, optical, or radio) for the medium.

Question 4

What is multiplexing at the Transport Layer?

Accepted Answer

Enabling multiple applications to share a network connection using port numbers

Answer

Port numbers let multiple applications simultaneously use the same network connection.

Question 5

Which Data Link sublayer handles media access control and physical addressing?

Accepted Answer

MAC (Media Access Control)

Answer

The MAC sublayer manages physical addressing (48-bit MAC addresses) and media access methods (CSMA/CD, CSMA/CA).

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