Huawei H35-211_V2.5 - HCIP-Access V2.5

Huawei GPON design recommends at most two splitting stages and a total split ratio within the optical power budget (commonly up to 1:64 for standard budgets).

A: 1:2 × 1:16 = 1:32 (valid).

C: 1:8 × 1:8 = 1:64 (valid under standard budgets).

D: 1:2 × 1:8 = 1:16 (valid).

B: 1:16 × 1:16 = 1:256, which exceeds typical GPON budgets and recommended engineering practice. Hence B is the incorrect networking.

SSH provides secure remote login and secure file transfer (SCP/SFTP) with encryption, integrity, and authentication. Clients validate the server/host and then perform user authentication (password, public key, etc.), often described as two layers of authentication. SSH runs over TCP (port 22) at the application layer, not at the network layer—therefore D is the incorrect statement.

IP multicast is designed for one-to-many delivery, allowing a single source stream to be replicated in the network only where branching is required. Compared with sending multiple unicast copies, multicast significantly reduces bandwidth consumption on shared links and provides efficient point-to-multipoint distribution. This is the core rationale for using multicast in video/TV services on campus and access networks.

This is wrong. A PON port LED not green may indicate several states—not only a hardware fault. It can mean the port is administratively shutdown, no ONUs are registered, or the port is in an alarm or idle state depending on the LED color and blinking pattern. Fault requires correlation with alarms and performance counters in U2000, not LED color alone.

According to Huawei HCIP-Access V2.5 learning materials and official Huawei Access Network product documentation, a 10G EPON PONI port supports both EPON (1.25 Gbit/s) and 10G EPON (10 Gbit/s) transmission modes.

These two modes are not combined — they operate on different wavelengths and serve different types of Optical Network Units (ONUs):

EPON uses a 1490 nm wavelength for downstream transmission with a rate of 1.25 Gbit/s.

10G EPON uses a 1577 nm wavelength for downstream transmission with a rate of 10 Gbit/s.

When an OLT (Optical Line Terminal) port supports dual-mode operation, it automatically adapts to the connected ONU type — but it does not aggregate the bandwidth of both technologies. Each ONU communicates using only one rate (either EPON or 10G EPON).

Therefore, the total downstream bandwidth is not the sum of both rates. It depends solely on the ONU’s operational mode.

Hence, the statement is False.

Answer: B

References (from HCIP-Access V2.5 and Huawei Technical Documents):

HCIP-Access V2.5 Study Guide – “Huawei Campus Network Overview” Chapter, Section: PON Technologies Overview

Huawei Access Network 10G EPON Technology White Paper (Huawei Enterprise Documentation Center)

Huawei MA5800/EA5800 Series OLT Product Description – “Dual-Mode EPON/10G EPON PON Ports”