156-215.81.20 · Question #109
How many layers make up the TCP/IP model?
The correct answer is B. 4. See the full explanation below for the reasoning.
Question
How many layers make up the TCP/IP model?
Options
- A6
- B4
- C7
- D2
How the community answered
(18 responses)- A6% (1)
- B78% (14)
- C6% (1)
- D11% (2)
Community Discussion
4
Mei-Ling H.Oct 22, 2025The TCP/IP model has 4 layers: Network Access (sometimes called Link), Internet, Transport, and Application. This is the answer the exam expects, so mark B. People sometimes confuse this with the OSI model, which has 7 layers, so if you see 7 as an option that is the classic trap on this type of question. The TCP/IP model collapses several OSI layers together, for example the OSI Presentation and Session layers are both absorbed into TCP/IP Application layer, which is why the count drops from 7 to 4.
Luis F.Oct 6, 2025Yeah B is right, TCP/IP has 4 layers: Network Access, Internet, Transport, and Application. A lot of people mix it up with the OSI model which has 7, so just remember TCP/IP is the simpler one with 4.
Anastasia B.Oct 12, 2025B is right, TCP/IP has 4 layers: Network Access, Internet, Transport, Application.
Mei-Ling H.Oct 13, 2025Yes, that is the standard 4-layer model, but watch out because some exam questions label that bottom layer "Network Interface" instead of "Network Access," and a few older study guides split it into Physical and Data Link to get 5 layers, so always check the exact wording in the question stem before you answer.