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Which of the following statements are incorrect ?
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 .
HCIA Huawei ACCESS Official Documentation , Chapter: GPON and XGS-PON Coexistence.
ITU-T G.9807.1 Standards for XGS-PON .
Which of the following statements about static routes is correct?
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 .
HCIA Huawei ACCESS Official Documentation , Chapter: Static Routing.
Routing Protocols and Static Routes by Huawei.
Which of the following statements about XGS-PON key technologies are incorrect? (Select All that Apply)
Comprehensive and Detailed Step by Step
A (Incorrect):XGS-PON encrypts thepayload, not the entire packet.
The OLT supports QinQ and VLAN stacking attributes. Which of the following VLANs supports QinQ?
QinQ Overview :
QinQ (IEEE 802.1ad) is a double-tagging mechanism that adds an outer VLAN tag to an already tagged packet.
It is commonly used in carrier networks to extend VLAN capacity and support hierarchical VLAN architectures.
VLAN Types :
Sub VLAN : Part of a Super VLAN configuration, used for IP address conservation. Does not support QinQ.
Common VLAN : Supports only single-tag VLANs. Does not support QinQ.
Super VLAN : Aggregates multiple Sub VLANs for IP address sharing. Does not support QinQ.
Smart VLAN : Specifically designed to support advanced features like QinQ and VLAN stacking.
Why D?
Smart VLAN is the only VLAN type that supports QinQ and VLAN stacking, making it the correct choice.
Thus, the correct answer is D .
HCIA Huawei ACCESS Official Documentation , Chapter: VLAN Design.
IEEE 802.1ad QinQ Standards .
