AAA Accounting Tracks Traffic and Duration, Not Only Fees

What AAA accounting means AAA separates access control into authentication, authorization, and accounting. The accounting leg is the record-keeping function: after a user is admitted and authorized, the network access server or AAA server can log what that user consumed—session start and stop, duration, uplink and downlink bytes, IP address, commands, and sometimes service type. It is not a payment engine; it is a usage-information engine.

Billing is a consumer, not the definition Charges may be calculated from accounting records, but the records are broader than money. A campus WLAN controller can send per-session traffic and online time to a RADIUS server, and an administrator can use those same records for auditing, capacity planning, security investigation, or quota enforcement. Therefore, the statement in the question—that accounting records only fees and not Internet traffic or duration—reverses the actual relationship. A participant similarly observes that accounting registers connection time and Internet traffic as well as charges, which is the right reading.

Applying it to the option Because the claim explicitly excludes traffic and duration, both of which are canonical accounting attributes, it cannot be true. Option A (TRUE) accepts the false restriction; option B (FALSE) rejects it. The decisive action is to classify accounting by the data it collects, not by one of its downstream uses. That gives B.

Why the trap works The word accounting suggests a ledger and fees, so a test taker can overlook that AAA accounting is about accountability for resource use. In Huawei VRP and standard RADIUS or TACACS+ deployments, accounting records are the raw usage evidence that a billing system might later rate; the absence of a billing system does not make the records disappear. If an item says accounting is only billing, only fees, or only time—without allowing traffic—it is usually false.