CCP TCP/IP & OSI Model Layers 3

Question 1

Which OSI layer handles the syntax and semantics of data exchanged, including encryption and compression?

Accepted Answer

Presentation layer

Answer

The Presentation layer (Layer 6) is responsible for data format translation, encryption, and compression.

Question 2

UDP is preferred over TCP in applications where:

Accepted Answer

Low latency matters more than guaranteed delivery

Answer

UDP's connectionless, low-overhead nature makes it ideal for real-time applications like VoIP and video streaming where speed outweighs reliability.

Question 3

What is the purpose of the ICMP protocol in the TCP/IP suite?

Accepted Answer

Reporting network errors and diagnostic information

Answer

ICMP (Internet Control Message Protocol) is used to send error messages and operational information about network conditions, as used by ping and traceroute.

Question 4

In OSI terminology, the unit of data at the Data Link layer is called a:

Accepted Answer

Frame

Answer

The Protocol Data Unit (PDU) at the Data Link layer is called a frame, which includes the MAC header and trailer.

Question 5

Which field in the IPv4 header identifies the higher-layer protocol (e.g., TCP, UDP) carried in the payload?

Accepted Answer

Protocol

Answer

The Protocol field in the IPv4 header indicates which transport-layer protocol (TCP=6, UDP=17, ICMP=1) is encapsulated.

(CCP) Certified Computing Professional Practice Test

(CCP) Certified Computing Professional Practice Test

CCP TCP/IP & OSI Model Layers 3