Which two statements are true about DPT/RPR?

Question

Options

• ADPT/RPR uses a bi-directional ring consisting of two symmetric counter rotating fibre rings.
• BDPT/RPR is defined in the IEEE 802.17 standard and it uses Token Bucket system to avoid collisions
• CDPT/RPR can be deployed in the Core of the SP networks where point-to-point POS links are used
• DIn DPT/RPR rings, data packets can be sent in one direction (downstream) and the corresponding

• A
  72% (18)
• B
  8% (2)
• C
  20% (5)

Explanation

SONET/SDH is the accepted transport architecture. The key building block is the twin optical fiber ring forming point-to-point connections that are "nailed up" between several SONET/SDH add-drop multiplexers (ADM). ?The twin fiber rings in SONET/SDH ring run in parallel, one is the working ring carrying the communication traffic. The other is the protection ring acting as a backup in the event of cable failure or failure of an ADM SONET/SDH provides good quality performance monitoring and failure protection information which also travel along the ring. The exclusive use of one ring for data and the other for protection means one ring is fully utilized and the other ring is virtually redundant, awaiting the unlikely event of a failure. This, of course, is not the most efficient use of fiber, especially given the considerable cost to lay fiber.

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