H35-211_V2.5 Exam Dumps : HCIP-Access V2.5

In IP multicast, only one copy per multicast group (program) is forwarded upstream, regardless of how many users are watching it. Replication happens downstream at the access/edge, not toward the core. Therefore the upstream traffic equals the number of active multicast groups × per-group bitrate:

20 programs × 2 Mbit/s = 40 Mbit/s.

This behavior is consistent with Huawei’s multicast feature descriptions and general multicast principles (IGMP/PIM), which explain that multicast traffic is sent as a single flow per group and replicated only where branching occurs, not multiplied by user count.

In capacity planning, the planned bandwidth is computed as:

Planned Bandwidth = Users × Penetration × Concurrency × Online Bandwidth × Duty Cycle × Channels × Coverage.

Substituting the values: 500 × 0.5 × 0.4 × 4 Mbit/s × 0.125 × 1 × 0.7

= 250 × 0.4 × 4 × 0.125 × 0.7

= 100 × 4 × 0.125 × 0.7

= 400 × 0.125 × 0.7

= 50 × 0.7

= 35 Mbit/s.

This matches the given result, so the statement is true.

In 10G-EPON (IEEE 802.3av), the wavelength plan uses 1577 nm downstream and 1270 nm upstream. The 1270 nm upstream is used in both asymmetric and symmetric 10G-EPON profiles.