IT Certification Practice Exams

CCNA 640-802 Exam Practice Questions
OSI and DoD models comparison

Q6. Match the corresponding layers of ISO and DoD models?

DoD Model <---------> ISO OSI Model

A. Process/Application 1. Application

B. Host-to-Host 2. Presentation

C. Internet 3. Session

D. Network Access 4. Transport

5. Network

6. Data Link

7. Physical

Choose best choice:

A. A->1+2; B->3+4; C->5; D->6+7

B. A->1+2+3; B->4; C->5; D->6+7

C. A->1+2+3; B->4; C->5+6; D->7

D. A->1+2+3; B->4+5; C->6; D->7

Correct answer: B

Explanation:

DoD Model maps to OSI model as below:

Process/ Application maps to OSI's Application, Presentation,Session layers (layers 7,6,5).

Host-to-Host maps to ISO's Transport layer (layer 4).

Internet maps to ISO's Network layer (layer 3).

Network Access maps to ISO's Data Link and Physical Layers (layers 6,7).