Which tier corresponds to computer-to-computer VoIP services such as Skype?

Which tier corresponds to computer-to-computer VoIP services such as Skype?

• A. Tier III or tertiary
• B. Tier I
• C. Tier II
• D. Tier IV

Answer: (A)

The main idea is how networks are organized by tier, with Tier III representing the networks that actually connect end users to the Internet. Computer-to-computer VoIP like Skype runs over the public Internet from one user device to another, so the traffic is carried by consumer access networks that bring Internet service to homes and small businesses. That makes Tier III the best fit, since it describes the networks closest to the end user handling direct user traffic. Tier I and Tier II cover the backbone and regional transit roles, not the end-user access you see with consumer VoIP, and Tier IV is a last-mile designation used in some models but is less applicable here.

The main idea is how networks are organized by tier, with Tier III representing the networks that actually connect end users to the Internet. Computer-to-computer VoIP like Skype runs over the public Internet from one user device to another, so the traffic is carried by consumer access networks that bring Internet service to homes and small businesses. That makes Tier III the best fit, since it describes the networks closest to the end user handling direct user traffic. Tier I and Tier II cover the backbone and regional transit roles, not the end-user access you see with consumer VoIP, and Tier IV is a last-mile designation used in some models but is less applicable here.