350-001 · Question #126
All of these are fundamental building blocks of a differentiated services Traffic Conditioner Block except which one?
The correct answer is D. querier. RFC 2475 ('An Architecture for Differentiated Services') defines the Traffic Conditioner Block (TCB), which sits at a DiffServ domain boundary and conditions incoming traffic. The five legitimate building blocks are: (1) Classifier - selects packets based on header fields; (2)…
Question
All of these are fundamental building blocks of a differentiated services Traffic Conditioner Block except which one?
Options
- Adropper
- Bclassifier
- Cmarker
- Dquerier
- Emeter
- Fshaper
How the community answered
(60 responses)- A2% (1)
- B3% (2)
- D88% (53)
- E5% (3)
- F2% (1)
Explanation
RFC 2475 ('An Architecture for Differentiated Services') defines the Traffic Conditioner Block (TCB), which sits at a DiffServ domain boundary and conditions incoming traffic. The five legitimate building blocks are: (1) Classifier - selects packets based on header fields; (2) Meter - measures the rate/volume of traffic against a profile; (3) Marker - sets the DSCP field to label traffic for PHB treatment; (4) Shaper - delays excess traffic to smooth the flow; and (5) Dropper - discards packets when the traffic profile is exceeded. 'Querier' is not a defined component of the DiffServ TCB in any relevant RFC and does not exist as a formal building block of this architecture.
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