Pass the Huawei HCIP-Access H35-210_V2.5 Questions and answers with CertsForce

The first 24 bits (OUI) of a MAC address are purchased by manufacturers from the IEEE. The remaining 24 bits are assigned by the manufacturer and are not customizable by end-users. While some advanced systems allow temporary MAC address changes, the statement is false because the OUI is fixed and tied to the manufacturer.

Let us analyze each statement:

Option A :

Correct : WDM1r multiplexers can be flexibly deployed close to the Central Office (CO) or closer to the user, depending on network design requirements.

Option B :

Incorrect : While GPON and XGS-PON share the same ODN architecture, simply changing the optical modules on an ONU is insufficient to support XGS-PON. The ONU hardware and software must also be compatible with XGS-PON standards.

Option C :

Incorrect : The deployment of WDM1r multiplexers introduces additional optical loss, which must be accounted for in the calculation of optical link attenuation.

Option D :

Correct : GPON (1490 nm downstream, 1310 nm upstream) and XGS-PON (1577 nm downstream, 1270 nm upstream) use non-overlapping wavelengths, allowing them to coexist on the same ODN using WDM.

Thus, the incorrect statements are B and C .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON and XGS-PON Coexistence.

ITU-T G.9807.1 Standards for XGS-PON .

PON Network Components :

OLT (Optical Line Terminal) : Central office equipment that connects to the core network.

ODN (Optical Distribution Network) : Consists of optical fibers, splitters, and connectors that distribute signals between the OLT and ONUs.

ONU (Optical Network Unit) : End-user equipment that connects to customer devices.

OAM (Operations, Administration, and Maintenance) :

OAM refers to a set of tools and protocols used for managing and maintaining the network. It is not a physical component of the PON system.

Why A?

OAM is a function or process, not a physical part of the PON network system.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: PON Network Components.

GPON System Architecture by Huawei.

SC (Large Square Head): Square connector with a push-pull design.

FC (Round Head): Round connector with a screw-on mechanism.

The Ethernet II frame is the most commonly used Ethernet frame format. It consists of several fields, and its structure is well-defined in networking standards.

Structure of the Ethernet II Header :

Destination MAC Address (6 bytes) : Specifies the MAC address of the intended recipient.

Source MAC Address (6 bytes) : Specifies the MAC address of the sender.

EtherType (2 bytes) : Indicates the protocol encapsulated in the payload (e.g., IPv4, ARP).

Total Size :

The Ethernet II header without a VLAN tag is 14 bytes in size.

If a VLAN tag is added (using IEEE 802.1Q), the header size increases to 18 bytes due to the additional 4-byte VLAN tag.

Why Not Other Options?

32 bytes : This is incorrect because the Ethernet II header is much smaller.

22 bytes : This is incorrect because the header size is fixed at 14 bytes (without VLAN tagging).

18 bytes : This would only apply if VLAN tagging were included, which is not specified in the question.

Thus, the correct answer is 14 bytes .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: Ethernet Frame Structure.

IEEE 802.3 Ethernet Standards .

Dynamic Bandwidth Assignment (DBA) :

DBA dynamically allocates upstream bandwidth among ONUs based on their traffic demands. Different DBA types are used for different service requirements.

DBA Types :

Type 1 : Fixed bandwidth allocation, suitable for constant bit-rate services like voice.

Type 3 : Mixed allocation, combining fixed and assured bandwidth. It is commonly used for AR (Assured Rate) services, which require guaranteed minimum bandwidth with flexibility for additional bandwidth.

Type 4 : Best-effort allocation, suitable for non-critical services like web browsing.

Why B?

Type 3 is specifically designed for AR services, providing both guaranteed and flexible bandwidth allocation.

Thus, the correct answer is B .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: GPON DBA Mechanism.

ITU-T G.984.x Standards for GPON .

VLAN Attributes :

Common VLAN : Used for standard VLAN tagging, where a single VLAN tag identifies the VLAN.

QinQ VLAN : Adds an additional VLAN tag for double-tagging, typically used in carrier networks.

Sub VLAN : Part of a Super VLAN configuration, used for IP address conservation.

Stacking VLAN : Similar to QinQ, used for double-tagging.

Scenario Analysis :

The school uses a single VLAN tag to identify services by type (e.g., student, faculty, administration).

Since only one VLAN tag is used, the appropriate VLAN attribute is Common .

Why A?

Common VLAN is the simplest and most suitable choice for scenarios requiring single-tag VLAN identification.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.

IEEE 802.1Q VLAN Tagging Standards .

Static routes are manually configured by network administrators and are not dynamically updated by routing protocols. Let us analyze each option:

Option A :

Correct : Static routes are manually added to the routing table by the administrator. They remain unchanged unless manually modified or removed.

Option B :

Incorrect : Static routes are not automatically recalculated when the network topology changes. If a static route becomes invalid due to a topology change, the administrator must manually update it.

Option C :

Incorrect : Static routes are not learned from other routing protocols. Routes learned from dynamic protocols (e.g., OSPF, RIP) are dynamic routes, not static routes.

Option D :

Incorrect : Static routes are not preconfigured on routers before delivery. They are configured by administrators based on the network design.

Thus, the correct answer is A .

References:

HCIA Huawei ACCESS Official Documentation , Chapter: Static Routing.

Routing Protocols and Static Routes by Huawei.

When a router forwards packets, it selects the route with the longest prefix match (most specific route) for the destination address.

First Route : Matches 9.0.0.0/8, which covers all IP addresses starting with 9.

Second Route : Matches 9.1.0.0/16, which is more specific and covers IP addresses starting with 9.1.

For the destination address 9.1.4.5 , the second route (9.1.0.0/16) is a better match because it is more specific than the first route (9.0.0.0/8).

Option A : Incorrect. OSPF has a higher priority, but the longest prefix match takes precedence over priority.

Option B : Correct. The second route matches the destination address more accurately.

Option C : Incorrect. Metric is not considered when comparing routes with different prefix lengths.

Option D : Incorrect. Interface speed is irrelevant in route selection.

References:

HCIA Huawei ACCESS Official Documentation , Chapter: IP Routing Table Selection.

Routing Principles and Longest Prefix Match by Huawei.