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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting | 10% | - Network diagnostics - Issue resolution strategies |
| Topic 2: Network Cutover | 7% | - Migration planning techniques - Rollback procedures |
| Topic 3: Advanced BGP Features | 10% | - Route reflector and attributes - BGP policy controls |
| Topic 4: Advanced Ethernet Technologies | 10% | - MAC/security features - VLAN and Ethernet enhancements |
| Topic 5: Advanced IGP Features | 17% | - OSPF advanced capabilities - IS-IS advanced optimisations |
| Topic 6: MPLS Technologies | 19% | - MPLS VPN basics - MPLS LDP and TE |
| Topic 7: IPv6 Routing | 20% | - IPv6 static and dynamic routing - OSPFv3/IS-IS for IPv6 |
| Topic 8: Network O&M | 7% | - Monitoring and health metrics - Operation & maintenance best practices |
>> Latest H12-831_V1.0 Exam Practice <<
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NEW QUESTION # 42
As shown in the figure, the VRRP virtual IP address of network R1 and R2 is configured as
10.0.12.254. After the configuration is completed, the network engineer checks the VRRP status on R1 and R2. Both devices are in the Master state. Which of the following will not cause this phenomenon?
Answer: B
NEW QUESTION # 43
On the network shown in the figure, the network administrator configures the DHCP snooping trust function on the switch.
* GE0/0/2 is a trusted interface (connected to the DHCP Server).
* GE0/0/3 is an untrusted interface (potential attacker).
Which of the following statements are true about the two interfaces?
Options:
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding DHCP Snooping
DHCP Snooping is a security feature that filters untrusted DHCP messages to prevent attacks such as:
* Rogue DHCP servers distributing incorrect IP addresses.
* DHCP starvation attacks.
In DHCP Snooping , switch ports are classified as:
* Trusted Interfaces : Allow both DHCP requests and DHCP responses to pass through.
* Untrusted Interfaces : Allow only DHCP requests but drop DHCP responses (to prevent rogue DHCP servers).
2. Analyzing Each Answer Option
* Option A: " When receiving a DHCP response packet on GE0/0/2, the switch forwards the packet through GE0/0/1. "
* Correct.
* GE0/0/2 is a trusted interface (connected to the DHCP server).
* DHCP responses (ACK, NAK, OFFER) come from the DHCP Server .
* Since DHCP responses are allowed on trusted interfaces, the switch forwards them to the client (PC1) via GE0/0/1 .
* Option B: " When receiving a DHCP request packet on GE0/0/2, the switch forwards the packet through GE0/0/3. "
* Incorrect.
* DHCP requests originate from clients (PC1, attackers, etc.), not from the DHCP server.
* The DHCP request should be forwarded to the DHCP server via a trusted interface (not GE0/0
/3, which is untrusted).
* Option C: " When receiving a DHCP response packet on GE0/0/3, the switch forwards the packet through GE0/0/1. "
* Incorrect.
* GE0/0/3 is an untrusted interface (connected to the attacker).
* DHCP responses (ACK, OFFER) from untrusted interfaces are dropped to prevent rogue DHCP attacks.
* The switch will not forward the packet .
* Option D: " When receiving a DHCP request packet on GE0/0/3, the switch forwards the packet through GE0/0/2. "
* Correct.
* DHCP requests originate from clients (PC1 or attacker).
* Since DHCP requests are allowed on untrusted interfaces , the switch forwards them to the DHCP server via the trusted interface (GE0/0/2).
Final answer:
# A and D are correct.
HCIP-Datacom-Advanced Routing & Switching Technology References:
* DHCP Snooping and Port Trust Classification
* How Trusted and Untrusted Ports Handle DHCP Packets
* Preventing Rogue DHCP Servers Using DHCP Snooping
NEW QUESTION # 44
In BGPIMPLS IP VPN, if the OSPF protocol is used between PEs and CEs to exchange routing information, the domain identifier (Domain ID) is used to distinguish whether the incoming routes in the VPI instance come from the same OSPF domain.
Answer: A
NEW QUESTION # 45
In the figure, the company wants to ensure secure communication between the headquarters and branch, and isolate the R&D areas from non-R&D areas, without changing the current network deployment.
To meet this requirement, an administrator deploys BGP/MPLS IP VPN on the network.
Which of the following statements are true?
Answer: A,B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To verify the correct answers, let's analyze how BGP/MPLS IP VPN is used for secure communication and isolation in an enterprise network.
1. Understanding BGP/MPLS IP VPN Concepts
MPLS VPN (Multiprotocol Label Switching Virtual Private Network) is used to:
* Allow communication between specific sites by using Route Targets (RTs).
* Ensure isolation of specific areas (e.g., R&D vs. non-R&D) by controlling RT import/export policies
.
* Utilize Route Distinguisher (RD) to make overlapping IP addresses unique within the VPN.
2. Analyzing the Answer Choices
# A. "To enable communication between the headquarters and branch R&D areas, both the ERT and IRT of VPN1 and VPN2 can be set to 100:100." # TRUE
* Explanation:
* ERT (Export Route Target) and IRT (Import Route Target) define which VPNs share routing information.
* If VPN1 (HQ R&D) and VPN2 (Branch R&D) use the same RT (100:100), they will exchange routes, enabling communication.
* Correct configuration:
VPN1: ERT 100:100, IRT 100:100
VPN2: ERT 100:100, IRT 100:100
* # This is correct and enables communication between HQ and branch R&D areas.
# B. "To implement communication between the headquarters and branch R&D areas, the RDs of VPN1 and VPN2 need to be set to the same value." # FALSE
* Explanation:
* RD (Route Distinguisher) is only used to make overlapping IP addresses unique within the MPLS VPN.
* RD does NOT control route exchange between VPNs (RTs control route exchange).
* VPN1 and VPN2 can have different RDs but still communicate if they share the same RT (100:100).
* # RDs do NOT need to be the same for VPNs to communicate.
* # This statement is false.
# C. "R&D areas and non-R&D areas have overlapping address spaces. Therefore, services in the two areas cannot be isolated." # FALSE
* Explanation:
* Overlapping address spaces are common in MPLS VPNs and can be isolated using unique Route Targets (RTs).
* As long as VPNs have different RTs, their traffic remains isolated.
* For example:
VPN1 (R&D): RT 100:100
VPN3 (non-R&D): RT 200:200
* Even with overlapping IPs, R&D and non-R&D areas are completely isolated.
* # This statement is false.
# D. "To isolate R&D areas from non-R&D areas at the headquarters, the RTs of VPN1 can all be set to 100:100 and the RTs of VPN3 can all be set to 200:200." # TRUE
* Explanation:
* Setting different RTs for R&D (100:100) and non-R&D (200:200) ensures complete isolation
.
* Correct configuration:
VPN1 (R&D): RT 100:100
VPN3 (non-R&D): RT 200:200
* Since VPN1 and VPN3 do NOT share the same RTs, their routes remain separate.
* # This ensures isolation between R&D and non-R&D areas.
NEW QUESTION # 46
In the hub-spoke networking shown in the figure, the Hub-PE can be configured to allow repetitive local AS numbers for correct route transmission.
Answer: A
NEW QUESTION # 47
......
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