200-301 · Question #724
Which three encapsulation layers in the OSI model are combined into the TCP/IP application layer? (Choose three)
The correct answer is A. Session C. presentation D. application. The TCP/IP model's Application layer combines the functionalities of the OSI model's Session, Presentation, and Application layers.
Question
Which three encapsulation layers in the OSI model are combined into the TCP/IP application layer? (Choose three)
Options
- ASession
- Btransport
- Cpresentation
- Dapplication
- Edata-link
- Fnetwork
How the community answered
(50 responses)- A94% (47)
- B2% (1)
- E4% (2)
Why each option
The TCP/IP model's Application layer combines the functionalities of the OSI model's Session, Presentation, and Application layers.
The Session layer (OSI Layer 5) establishes, manages, and terminates communication sessions, which is incorporated into the TCP/IP Application layer.
The Transport layer (OSI Layer 4) maps to the TCP/IP Transport layer, not the Application layer.
The Presentation layer (OSI Layer 6) handles data formatting, encryption, and compression, tasks also handled by protocols within the TCP/IP Application layer.
The Application layer (OSI Layer 7) provides network services to end-user applications and is directly mapped to the TCP/IP Application layer.
The Data-Link layer (OSI Layer 2) maps to the TCP/IP Network Access layer, not the Application layer.
The Network layer (OSI Layer 3) maps to the TCP/IP Internet layer, not the Application layer.
Concept tested: OSI and TCP/IP model comparison
Source: https://www.cisco.com/c/en/us/support/docs/ip/ip-protocols/113110-tcpip.html
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