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NEW QUESTION # 209
An LSR supports various label retention modes. Which of the following statements regarding the liberal mode are correct?
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
In MPLS (Multi-Protocol Label Switching), thelabel retention modedetermines how an LSR (Label Switching Router) handles labels received from its neighbors:
Liberal Mode:
An LSRretains all labels distributed by its neighbors, not just the labels from the next-hop LSR.
This approachensures faster convergencebecause the LSR does not need to request new labels if the next hop changes.
Itdoes not save memory or label space, as it stores more labels than strictly necessary.
Conservative Mode:
An LSRonly retains labels from its next-hop neighbors, saving memory and label space.
StatementsCandDare correct because they accurately describe liberal mode.
StatementsAandBare incorrect because they describe conservative mode.
NEW QUESTION # 210
In an HWIP multicast network, where multiple sources exist and each source has several receivers, which protocol allows source-to-RP traffic and RP-to-receiver traffic to share the same tree 2?
Answer: E
NEW QUESTION # 211
BGP EVPN can be used as the VXLAN control plane protocol to completely prevent traffic flooding, such as broadcast ARP packets, on the VXLAN network.
Answer: B
Explanation:
Understanding VXLAN and BGP EVPN Control Plane
VXLAN (Virtual eXtensible LAN)is anoverlay network technologythat enablesLayer 2 (L2) extension over an IP-based networkusingMAC-in-UDP encapsulation.
#Traditional VXLAN Flooding Issue:
Without BGP EVPN, VXLAN usesflood-and-learnbehavior for MAC address learning.
Broadcast, Unknown Unicast, and Multicast (BUM) trafficis flooded to all VTEPs, which is inefficient.
#How Does BGP EVPN Solve Flooding?
BGP EVPN (Ethernet VPN) replaces the flood-and-learn model with a distributed control plane.
MAC/IP bindings are advertised through BGP EVPN Type 2 routes, eliminating the need forflooding ARP requests.
VXLAN routers learn MAC addressesproactivelyinstead of relying on flooding.
Why is the Answer TRUE?
#BGP EVPN fully prevents ARP flooding by distributing MAC/IP bindings via control plane updates.
#VTEPs only send traffic to known destinations, reducing network congestion.
#BGP EVPN is the industry standard for large-scale data center and campus VXLAN deployments.
Real-World Application:
Data Centers:Avoids unnecessaryARP request floodingin large cloud networks.
Campus Networks:ReducesL2 broadcast storms, improving network efficiency.
Service Provider Networks:Enablesscalable multi-tenant VXLAN solutions.
#Reference:Huawei HCIE-Datacom Guide - VXLAN BGP EVPN Control Plane Architecture
NEW QUESTION # 212
OSPF is deployed on a campus network to implement network interconnection. An engineer configures R2 as shown in the figure. Which of the following statements is incorrect about LSAs on the OSPF network?
Answer: C
Explanation:
#Analyze the Configuration:
[R2] acl 2000
[R2-acl-basic-2000] rule deny
[R2] ospf
[R2-ospf-1] area 1
[R2-ospf-1-area-0.0.0.1] filter 2000 import
[R2-ospf-1-area-0.0.0.1] quit
[R2-ospf-1] default-route-advertise always
#Understanding Key Concepts:
Type 3 LSAs (Inter-Area Routes):
Generated by ABRs to advertisesummary routesbetween areas.
Filtering Type 3 LSAsis possible using import filters (like in Area 1).
Type 5 LSAs (External Routes):
Flooded only within the same ASbutdo not enter stub or NSSA areas.
#Breakdown of the Options:
A: Type 5 LSAs are flooded in Area 1##Incorrect
If Area 1 is astub or NSSA, thenType 5 LSAs are not allowed.
Although the diagram does not explicitly say Area 1 is a stub/NSSA,real deployments often use stub areas at the edge (like Area 1).
More importantly,the filter is applied to Area 1, and there isno redistributionof external routes into Area 1 in the config.
Therefore, Type 5 LSAs wouldnot be floodedthere.
B: Type 3 LSAs are not flooded in Area 1##Correct
The command filter 2000 import with ACL rule deny meansType 3 LSAs are filtered from Area 0 into Area 1.
C: Type 3 LSAs are not flooded in Area 2##Correct
There isno filter applied to Area 2, so thiscould be false,butsince the question asks for the incorrect statement, this is not the answer.
D: Type 5 LSAs are flooded in Area 2##Correct
Area 2 is not shown to be stub or NSSA, and there's no filter or restriction configured.
Hence,Type 5 LSAs are allowedandflooded in Area 2.
#A. Type 5 LSAs are flooded in Area 1.
NEW QUESTION # 213
NAFTIR policing can only be applied to the inbound direction. Its purpose is to monitor the traffic entering the device and ensure that the upstream device does not unnecessarily consume network resources.
Answer: B
Explanation:
* NAFTIR (Network Address Flow Traffic Incoming Rate) policing is a traffic control mechanism that can only be applied to inbound traffic.
* Purpose:
* Monitors and limits the traffic entering a network device.
* Prevents upstream devices from overloading the network with excessive data.
* Key Fact: Outbound policing requires different mechanisms like QoS shaping or traffic scheduling.
# Reference: Huawei HCIE-Datacom Study Guide - Traffic Policing and Shaping
NEW QUESTION # 214
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