H35-211_V2.5 Exam Dumps - Huawei HCIP-Access Questions and Answers

In Huawei access network devices (such as MA5800, EA5800, and SmartAX series), the DHCP Option 82 (Relay Agent Information Option) feature is used to identify the source location of DHCP requests coming from users connected to access ports.

This helps the DHCP server assign IP addresses based on access topology information, such as slot, port, and VLAN IDs.

When Option 82 is enabled globally and within the VLAN service profile, and the port/service-port is configured to allow user-side packets to carry Option 82, the device processes incoming DHCP requests as follows:

If a user-side DHCP packet does not contain Option 82:→ The device automatically adds local Option 82 information (e.g., circuit ID, remote ID) before forwarding it to the DHCP server.

If a user-side DHCP packet already contains Option 82:→ The device removes (strips) the existing Option 82 field to prevent spoofing or inconsistent location data.→ Then it adds its own local Option 82 information (accurate relay agent data based on the device’s configuration).→ The modified packet is then forwarded to the DHCP server.

This ensures that only trusted network-side Option 82 data is passed along, maintaining accurate user-location binding for IP address management and security.

Therefore, the correct behavior is:

The access device strips the Option 82 field from the user packet and adds its own local Option 82 information.

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

HCIP-Access V2.5 Study Guide – “Huawei Campus Network Overview” Chapter, Section: DHCP Relay and Option 82 Mechanism

Huawei MA5800/EA5800 Configuration Guide – IP Service → DHCP Relay and Option 82 Configuration

Huawei Enterprise Networking Product Documentation: “Understanding DHCP Option 82 Processing”

Huawei Access Network Feature Guide, Section: Processing Policies of DHCP Packets with Option 82

On Huawei OLTs (e.g., MA5600T/MA5680T), deploying IPTV/multicast commonly uses a program list (channel list) to map program numbers to multicast group addresses—this is configured with igmp program. When programs are statically configured under the multicast VLAN, the program definitions themselves are mandatory; without them, set-top boxes cannot select (zap to) channels by program number/address mapping and the OLT cannot correctly forward the requested multicast streams.

In Type C single-attribution protection, two PON ports form a protection pair to one ONU/ODN, but only one path is active at a time.

B — Correct: Protection groups operate in active/standby mode; only one OLT-side PON port forwards user traffic at any moment.

A — Not necessarily correct: A branch fiber break local to one path can trigger switchover, but describing it as “the OLT work port becomes standby” is imprecise; the group performs role inversion based on configured triggers and signaling, not solely by OLT port state wording.

C — Not always: Uplink failure triggers switchover only if the protection group is explicitly configured to track the uplink Ethernet port; it is not an unconditional behavior.

D — Misleading: While service entries for the ONU remain consistent from a user perspective, additional protection-group configuration is required on the OLT; thus it is not “completely identical” to a non-protected setup.

(Reference: HCIP-Access V2.5 – Type C single-homing protection architecture, active/standby forwarding, and optional uplink-tracking triggers.)

In H.248, the MGC controls the MG by creating a Context (also called an empty connection) and then adding terminations to build point-to-point, multipoint, or conference topologies. During call setup the MGC typically creates an empty context first, then binds terminations as media is negotiated.

A is incorrect: contexts and terminations can be modified during the session.

B is incorrect as written (the association/context is released, not “used”).

C is incorrect: an MG limited to point-to-point cannot host three or more endpoints in one context.

For ONT zero-touch on eSight/iMaster NCE-Campus, the prerequisite is that the OLT is onboarded and provisioned (communication parameters, northbound credentials, templates) so that discovered ONTs can inherit policies and be auto-activated. During incremental OLT configuration, eSight does push/update the OLT’s configuration (templates, profiles, authentication rules). Saying “do not provision OLT” is therefore false.

In Huawei’s QoS theory (aligned with IETF), the recognized service models are Best Effort, Integrated Services (IntServ), and Differentiated Services (DiffServ). FIFO is a queueing discipline (scheduling method) rather than a service model. FIFO simply forwards packets in arrival order without classification or guarantees, and while it can be used within Best Effort, it is not itself a service model.

10G-EPON is designed for coexistence with EPON on the same ODN by using separate downstream wavelengths and dual-rate upstream mechanisms. Operators can realize a smooth upgrade at the OLT (local end) by inserting WDM mux/demux modules (or using dual-rate PON ports) while continuing to use the existing ODN fiber plant and splitters. This is a standard migration path emphasized in HCIP-Access materials for PON evolution.

GPON specifies data encryption (commonly AES-128) on downstream traffic so that one ONU cannot eavesdrop another’s data on the shared PON. This cryptographic protection is the standard, practical method to prevent monitoring on GPON access networks; the other options are operational workarounds, not normal GPON security mechanisms.

On Huawei VRP, Advanced IPv4 ACLs (which can match source IP, destination IP, and L4 port numbers) use the 3000–3999 numbering range.

2000–2999 = Basic IPv4 ACL (matches source IP only).

3000–3999 = Advanced IPv4 ACL (matches source/destination IP, protocol, ports).

4000–4999 = Layer 2 (MAC) ACL.

5000–5999 = User-defined/other ranges, not the standard advanced IPv4 range.

Therefore, to match IPs and ports, select 3000–3999.

Huawei’s E2E pre-connection ODN (pre-connectorized ODN) adopts factory-pre-terminated cables, closures and splitter modules. Features highlighted in HCIP-Access V2.5 include: splicing-free quick installation (raising build efficiency and reducing skill/tool dependence), compact pre-connected splitter boxes, distributed splitting that shortens drop lengths and reduces ducts/cables, and easy O&M because modules are plug-and-play with no field splicing.