When planning a DBA, if a user wants to apply for Internet access, which type of DBA should be used?

Question

Options

• Atype 4
• Btype 3
• Ctype 2
• Dtype 1

• A
  81% (22)
• B
  11% (3)
• C
  4% (1)
• D
  4% (1)

Explanation

Type 4 DBA (Best Effort) is the correct choice for Internet access because it allocates bandwidth dynamically based on what is available after higher-priority services are served - exactly how Internet traffic behaves, since it is bursty and does not require a strict bandwidth guarantee. Type 1 (Fixed) is wrong because it allocates a constant, pre-defined bandwidth regardless of actual demand, making it suited for constant-bit-rate services like TDM/voice, not variable Internet traffic. Type 2 (Assured) guarantees a minimum bandwidth floor, which is better suited for services like VoIP or video that need a quality baseline. Type 3 (Non-assured) provides dynamic allocation with some priority consideration but still isn't the standard choice for general Internet access, which needs pure best-effort delivery.

Memory tip: Think "Type 4 = For the Internet" - just as the Internet itself is a best-effort network with no delivery guarantees, Type 4 DBA mirrors that philosophy by giving available leftover bandwidth to the subscriber.

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