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NEW QUESTION # 312
In the following figure, OSPF is enabled on all router interfaces. The IP addresses marked in the figure belong to Loopback0 of the routers.
The Loopback0 addresses of R1 and R2 are advertised in Area 1, the Loopback0 address of R4 is advertised in Area 0, and the Loopback0 addresses of R3 and R5 are advertised in Area 2. Given this, which of the following IP addresses can ping each other?
Answer: D
Explanation:
Understanding OSPF Multi-Area Routing
# OSPF (Open Shortest Path First) is a link-state routing protocolthat uses ahierarchical area designfor scalability.
# OSPF Areas in the Diagram:
Area 0 (Backbone Area):ContainsR4 (Loopback 10.0.4.4/32).
Area 1:ContainsR1 (Loopback 10.0.1.1/32) and R2 (Loopback 10.0.2.2/32).
Area 2:ContainsR3 (Loopback 10.0.3.3/32) and R5 (Loopback 10.0.5.5/32).
R1 and R2 connect Area 1 to Area 0.
R1 and R3 connect Area 1 to Area 2.
How OSPF Advertises Routes Across Areas
#Intra-area communication (within the same area) is always possible.
#Inter-area communication is possible if the ABR (Area Border Router) correctly advertises routes.
#OSPF does NOT automatically advertise routes from one non-backbone area (e.g., Area 2) to another (e.g., Area 0) unless explicitly allowed.
Analysis of the Answer Choices:
#A. 10.0.3.3 and 10.0.5.5 (Incorrect)
Both R3 (10.0.3.3) and R5 (10.0.5.5) are inArea 2.
R3 and R5 can communicate directly, but OSPF rules require an Area Border Router (ABR) to share routing information between areas.
Since no information is provided about inter-area route redistribution, we cannot confirm that R3 and R5 can reach each other.
#B. 10.0.2.2 and 10.0.5.5 (Incorrect)
R2 (10.0.2.2) is in Area 1, and R5 (10.0.5.5) is in Area 2.
R2 does NOT have direct OSPF reachability into Area 2.
#C. 10.0.2.2 and 10.0.3.3 (Correct)
R2 (10.0.2.2) is in Area 1, and R3 (10.0.3.3) is in Area 2.
R1 connects both Area 1 and Area 2, meaning R2 and R3 can communicate via R1.
R1 is the ABR (Area Border Router) between Area 1 and Area 2, so it will advertise routes from R3 to R2 and vice versa.
#D. 10.0.4.4 and 10.0.2.2 (Incorrect)
R4 (10.0.4.4) is in Area 0 (Backbone), and R2 (10.0.2.2) is in Area 1.
R2 does NOT connect directly to Area 0, soR2 does not learn routes from Area 0 unless R1 explicitly redistributes them.
No explicit information about route redistribution is provided.
Final answer: C (10.0.2.2 and 10.0.3.3)
#Reference:Huawei HCIE-Datacom Guide - OSPF Multi-Area Routing & ABR Role Real-World Application:
Enterprise WAN Networks:Multi-area OSPF is used toscale large enterprise networkswhile maintainingfast convergence.
Service Provider Networks:ABRs control route distribution, preventingunnecessary flooding of routing updates across areas.
NEW QUESTION # 313
You try to trace a remote Internet address on your PC, but the traceroute stops after it reaches a router, and currently, the router should be in the incoming direction of the serial interface With an ACL "rule5 permit tcp source any destination any", you need to add which of the following ACLs to the router for traceoute to work
Answer: C
NEW QUESTION # 314
Which of the following statements are correct about the authentication protocols used in Portal authentication?
Answer: B,D
Explanation:
Comprehensive and Detailed Explanation:
# Portal authentication is a web-based authentication mechanism used in campus networks to control user access.
# Correct Statements:# (A) The Portal server exchanges authentication details with the access device, which forwards them to the authentication server.# (D) When using HTTP/HTTPS authentication, the client must send authentication credentials to the access device, which then forwards them to the authentication server.
# Incorrect Statements:# (B) HTTP/HTTPS support is mandatory for web-based authentication.# (C) If HTTP/HTTPS is used, Portal authentication may still be required.
# Reference: Huawei HCIE Datacom - Portal Authentication Mechanism
NEW QUESTION # 315
Refer to the following command output on the router R3. Which of the following statements are correct?
<R3> display interface Tunnel
Tunnel0/0/0 current state : UP
Line protocol current state : UP
Last line protocol up time : 15:21:26 UTC-08:00
Description: HUAWEI, AR Series, Tunnel0/0/0 Interface
Route Port, The Maximum Transmit Unit is 1500
Internet Address is 20.1.1.2/24
Encapsulation is TUNNEL, loopback not set
Tunnel source 10.0.3.3 (LoopBack0), destination 10.0.1.1
Tunnel protocol/transport GRE/IP, key disabled
keepalive disabled
Checksumming of packets disabled
Answer: A,B,D
Explanation:
From the output:
Tunnel destination IP address: Clearly shown as destination 10.0.1.1 ## Tunnel interface MTU: Shown as The Maximum Transmit Unit is 1500 ## Tunnel interface IP: Shown as Internet Address is 20.1.1.2/24 ## Tunnel source: Tunnel source 10.0.3.3 (LoopBack0) # Not 10.0.1.1 ## Therefore:
A- Correct
B- Correct
C- Correct
D- Incorrect (confuses destination as source)
Correct answers: A, B, C
NEW QUESTION # 316
As shown in the figure, ARP broadcast suppression is enabled on VTEP1 in BD 20 (VNI 200).
VTEP1 learns ARP information about PC2 through BGP EVPN routes.
When VTEP1 forwards the ARP request for PC1's MAC address to VTEP2,
What is the destination MAC address of the inner data frame?
Answer: B
Explanation:
Understanding VXLAN and ARP Suppression in BGP EVPN
VXLAN (Virtual Extensible LAN) is used to extend Layer 2 networks over Layer 3 infrastructure.
VXLAN uses VTEPs (VXLAN Tunnel Endpoints) to encapsulate and forward Layer 2 traffic.
BGP EVPN (Ethernet VPN) is used for MAC/IP address learning and distribution across VXLAN networks.
How ARP Request Forwarding Works in This Scenario?
1️⃣ ARP Broadcast Suppression Enabled (VXLAN Optimized Forwarding)
Since ARP broadcast suppression is enabled on VTEP1, the ARP request is not flooded.
Instead, VTEP1 checks its EVPN learned database to find PC2's MAC address (MAC C).
2️⃣ VTEP1 Encapsulates the ARP Request
VTEP1 encapsulates the ARP request in a VXLAN packet and sends it to VTEP2.
The original ARP frame inside the VXLAN tunnel still has:
Source MAC: MAC A (PC1's MAC)
Destination MAC: MAC C (PC2's MAC, learned via EVPN)
3️⃣ VXLAN Outer Headers
The outer VXLAN header uses:
Source IP: 1.1.1.1 (VTEP1)
Destination IP: 2.2.2.2 (VTEP2)
VNI (VXLAN Network Identifier): 200 (BD 20)
4️⃣ VTEP2 Receives and Forwards the ARP Request
VTEP2 decapsulates the VXLAN packet and forwards the original ARP request to PC2 (MAC C).
This ensures that only the intended receiver (PC2) gets the ARP request, preventing unnecessary broadcast flooding.
Why the Answer is MAC C?
✅ B. MAC C is Correct
The destination MAC of the inner data frame is PC2's MAC (MAC C).
This is because VTEP1 forwards the ARP request directly to VTEP2, which then forwards it to PC2.
Why Other Answers Are Incorrect?
❌ A. MAC B (Incorrect)
MAC B is VTEP1's MAC address, which is used in the outer VXLAN header, not in the inner Ethernet frame.
❌ C. MAC A (Incorrect)
MAC A is the source MAC of the ARP request (PC1), not the destination.
❌ D. MAC D (Incorrect)
MAC D is not mentioned in the topology, so it is irrelevant.
📖 Reference: Huawei HCIE Datacom - VXLAN BGP EVPN and ARP Suppression
NEW QUESTION # 317
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