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| Section | Objectives |
|---|---|
| Topic 1: BGP and Internet Routing | - BGP fundamentals
|
| Topic 2: Advanced Routing Protocols | - OSPF Advanced Concepts
|
| Topic 3: Network Design and Troubleshooting | - Enterprise network design
|
| Topic 4: MPLS and VPN Technologies | - MPLS fundamentals
|
| Topic 5: IPv6 and Network Services | - IPv6 routing technologies
|
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NEW QUESTION # 93
When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice)
Answer: B,C
NEW QUESTION # 94
In an MPLS L3VPN deployment, PE routers exchange VPNv4 routes through MP-BGP.
Customer routes are correctly learned from CE devices but are not installed into the correct VRF routing table on the remote PE. Which configuration element is most likely missing?
Answer: D
NEW QUESTION # 95
On the BGP/MPLS IP VPN network shown in the figure, which of the following RT settings can enable Sitel and Site2 to communicate with Site3?
Answer: A,C,D
Explanation:
A PE imports a VPNv4 route only when at least one RT attached to that route matches an Import RT configured in the receiving VPN instance. Bidirectional communication therefore requires reciprocal matching:
* Site1/Site2 ERT must match Site3 IRT.
* Site3 ERT must match Site1/Site2 IRT.
Evaluation of the displayed configurations:
* Option A - Correct: All PEs export and import 100:1. All three sites import one another's routes, providing full-mesh communication.
* Option B - Incorrect: PE1 exports 200:1, but PE3 imports only 100:1; PE3 exports 200:1, but PE1 imports only 100:1. Consequently, Site1 and Site3 cannot exchange routes bidirectionally.
* Option C - Correct: Site1 exchanges routes with Site3 through RT 100:1, while Site2 exchanges routes with Site3 through RT 200:1. PE3 imports and exports both RTs. This supports Site1-to-Site3 and Site2-to-Site3 communication while maintaining separate RT groups for Site1 and Site2.
* Option D - Correct: PE1 and PE2 export 200:1, which PE3 imports. PE3 exports 100:1, which PE1 and PE2 import. This is a valid hub-and-spoke RT design with Site3 functioning as the hub.
Huawei specifies that one site's Export RT must match the other site's Import RT, and the reverse matching must also exist for bidirectional communication. Huawei BGP/MPLS IP VPN configuration guide
NEW QUESTION # 96
On the network shown in the figure, the network administrator deploys DHCP snooping on the switch to defend against bogus DHCP server attacks.
Which of the following interfaces should be configured as the DHCP trusted interface?
Answer: D
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding DHCP Snooping and Trusted/Untrusted Ports
1. What is DHCP Snooping?
* DHCP Snooping is a security feature that prevents rogue DHCP servers from providing unauthorized IP configurations to clients.
* It categorizes switch ports into:
* Trusted Ports: Allow DHCP Offer and ACK messages from a legitimate DHCP server.
* Untrusted Ports: Block unauthorized DHCP responses to prevent rogue DHCP attacks.
Analyzing the Network Setup in the Figure
Interface
Connected Device
DHCP Role
Should it be Trusted?
GE0/0/1
PC1 (DHCP Client)
Requests DHCP leases
# Untrusted
GE0/0/2
DHCP Server (Legitimate)
Provides DHCP leases
# Trusted
GE0/0/3
Web Server
Not involved in DHCP
# Untrusted
GE0/0/4
Bogus (Rogue) DHCP Server
Malicious DHCP Server
# Untrusted & Blocked
* GE0/0/2 is connected to the legitimate DHCP server, meaning it should be marked as a TRUSTED interface.
* GE0/0/4 connects to a bogus DHCP server, which must be UNTRUSTED to block unauthorized DHCP responses.
* GE0/0/1 (Client) and GE0/0/3 (Web Server) do not need to be trusted.
# Thus, the correct answer is: D. GE0/0/2.
Final Conclusion:
# GE0/0/2 should be configured as the trusted DHCP interface.# GE0/0/1 (Client) should remain untrusted.# GE0/0/3 (Web Server) does not need DHCP trust.# GE0/0/4 (Bogus DHCP Server) should be blocked.
Thus, the correct answer is: D. GE0/0/2.
NEW QUESTION # 97
On the OSPF network shown in the figure:
* Area 1 is a common area .
* Area 2 is a totally NSSA (Not-So-Stubby Area) .
* Area 3 is an NSSA .
* R5 imports the external route 10.0.5.5/32 into OSPF .
Which of the following routers have the route 10.0.5.5/32 in their routing tables?
Answer: A,B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding OSPF Areas and Route Propagation in the Network:
* OSPF Area Types in the Question:
* Area 0 (Backbone Area) : Connects all areas and distributes routing information.
* Area 1 (Standard Area) : Regular OSPF area that can receive and forward external routes.
* Area 2 (Totally NSSA - Totally Not-So-Stubby Area) :
* Does not allow external routes except for a default route injected by the ABR.
* Area 3 (NSSA - Not-So-Stubby Area) :
* Allows external routes as Type 7 LSAs but does not accept Type 5 LSAs.
* How External Routes Are Advertised in This Scenario:
* R5 (in Area 3) imports 10.0.5.5/32 as an external route into OSPF.
* Since Area 3 is an NSSA , the external route is advertised as a Type 7 LSA (not Type 5).
* The ABR (R1) converts the Type 7 LSA into a Type 5 LSA and advertises it into Area 0.
* Once in Area 0 , this Type 5 LSA can be distributed to other areas except totally stubby or totally NSSA areas .
Route Distribution Analysis:
* R5 (Area 3) # R1 (Area 0, ABR) :
* R5 generates a Type 7 LSA for 10.0.5.5/32 .
* R1 (ABR) converts this Type 7 LSA into a Type 5 LSA and injects it into Area 0 .
* R2 (Area 0) # R3 (Area 0) :
* Since Area 0 allows external Type 5 LSAs , R2 and R3 receive 10.0.5.5/32 . # R2 and R3 have the route.
* R6 (Area 1) # Connected to Area 0 :
* Area 1 is a common area , meaning it can receive external Type 5 LSAs. # R6 has the route.
* R4 (Area 2 - Totally NSSA) :
* Totally NSSA areas do NOT accept Type 5 or Type 7 LSAs .
* Instead, they receive only a default route from the ABR (R3).
* Since R4 does not receive external routes explicitly, it does NOT have 10.0.5.5/32 . # R4 does NOT have the route.
Final Conclusion:
* # R2, R3, and R6 have the route 10.0.5.5/32 .
* # R4 does not have the route because Area 2 is a Totally NSSA and only gets a default route .
Thus, the correct answer is:
# R2, R3, and R6 have the route 10.0.5.5/32 in their routing tables.
Reference:
HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF Route Types and Area Behavior Huawei Official HCIP-Datacom Study Guide - OSPF LSA Types and Route Filtering in NSSA & Totally NSSA Areas Huawei Documentation on Type 7 to Type 5 LSA Conversion in NSSA Areas
NEW QUESTION # 98
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