Nokia Certified Network Associate (NCNA) — Question 1

Which tier of Internet service providers provides transit services to other ISPs?

Answer options

• A. Tier 1 and Tier 2 ISPs
• B. Tier 1 and Tier 3 ISPs
• C. Tier 2 and Tier 3 ISPs
• D. Tier 3 ISP

Correct answer: B

Explanation

The correct answer is B because Tier 1 ISPs have the capability to provide transit services to other ISPs, while Tier 3 ISPs generally do not have this capability. Tier 2 ISPs can also offer transit services, but they typically rely on Tier 1 for broader connectivity, making the combination of Tier 1 and Tier 3 the most accurate choice.