H12-831_V1.0-ENU PDF Exam Material 2025 Realistic H12-831_V1.0-ENU Dumps Questions
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NEW QUESTION # 91
Regarding the sham link, which of the following descriptions is wrong?
- A. Sham linkIt can be configured in any area and needs to be manually configured and the local endVPNThe instance must have tosham linkdestination address (peerPEofsham linkendpoint address) routing
- B. sham linkThe endpoint address of theBGPasVPhv4address published. passedsamlikThe route can also be reconfigured withVPNv4The form of routing is introduced toBGP
- C. becauseVPNflow is throughMPLSBackbone forwarding,sham linkThe routing cost should be less thanbackdoorroadOSPFrouting cost
- D. sham linkThe coat is twoVPNlinks between instances, eachVPNThere must be one in the instancesham linkthe endpoint address, it must bePEon the routerVPNone in the address space has32bitmaskedLoopbackinterface address
Answer: B
NEW QUESTION # 92
The network administrator A wants to use the IP Prefix List to match specific routing entries. Which of the following routes will be matched by the IP Prefix List? (Multiple choice)
- A. 10.0.2.0/24
- B. 10.0.0.1/30
- C. 10.0.0.0/24
- D. 10.0.1.0/24
Answer: B,C
NEW QUESTION # 93
As shown in the figure, all interfaces of the router enable OSPF. The IP address identified in the figure is the IP address of the oopback0 interface of the device. Loopback0 of R1 and R2 is advertised in area 1, Loopback0 of R4 is advertised in area 0, and Loopback0 of R3 and R5E are advertised in area 2, which of the following IP addresses can ping each other? (Multiple choice)
- A. 10.0.4.4 and 10.0.2.2. (3 types of normal calculation)
- B. 10.0.2.2 and 10.0.5.5 (not counted when receiving Category 3 in non-backbone areas)
- C. 10.0.3.3 and 10.0.5.5 (Class 1 in the same area)
- D. 10.0.2.2 and 10.0.3.3. (Not counted when receiving Category 3 in non-backbone areas)
Answer: A,C
NEW QUESTION # 94
As shown in the figure, OSPF is enabled on all interfaces of the router, and the ip address identified in the figure is the device's IP address.
Loopback0 presses the IP address of the port, RI, R2, R3EJLoopbacD is advertised in the area 1, R4 LoopbacfkD advertises in area D and which of the following functional addresses can be pinged between the LoopbackD announcements of R5 and R5 in area 2?
Areal
10.0.1.1/32
- A. 10.0.2.2 10.0.5.5
- B. 10.0.3.3 10.0.5.5
- C. 10.0.2.2and10.0.3.3
- D. 10.0.4.4and10.0.2.2
Answer: C
NEW QUESTION # 95
After the cutover is completeD. it is generally necessary to check the following items?
- A. data flow
- B. physical topology
- C. control plane entry
- D. Software version
Answer: A,C
NEW QUESTION # 96
Regarding the role of ping and tracert, which of the following statements is correct?
- A. Ping detects the two-way reachability between the correct end and the one-way icmp echo request packet
- B. Tracert must be able to trace every hop IP address from source to destination
- C. Ping verifies the reachability from the local end to the opposite end, it does not mean that the opposite end is reachable from the local end
- D. Tracert has the same function as ping, but the name is different
Answer: C
NEW QUESTION # 97
In a multi-level RR scenario, a large number of second-level RR are connected to the first-level RR, which may cause the BGP routing table of the first-level RR to overflow. What method can be used to reduce the risk of overflow of the BGP routing table of the first-level RR?
- A. Routing control
- B. ORF
- C. Set the same Cluster-lD
- D. Route aggregation
Answer: D
NEW QUESTION # 98
In an operator's MPLSVPN network, there are two devices, PE1 and PE2, for MPLSVPN data forwarding. PE1 receives a 172.16.1.0/24 private network route from the client, and transforms it into a VPNv4 route on PE1 and assigns labels. Released to PE2 as 1027. The outgoing label of the MPLSLSR-ID from PE2 to PE1 is 1025.
When the client on PE2 accesses 172.16.1.0/24, the inner and outer labels of the frame sent by PE2 should be the combination of the following options?
- A. Outer label: 1025, inner label: 1025
- B. Outer label: 1027, inner label: 1025
- C. Outer label: 1027, inner label: 1027
- D. Outer label: 1025, inner label: 1027
Answer: D
NEW QUESTION # 99
On the OSPF network shown in the figure, the cost values of links are marked. OSPF IP FRR is enabled on R1, and the maximum load-balancing 8 command is configured in the OSPF process. If a service passes through the path R1 # R5 # R3 to reach 10.0.3.3/32, which of the following is the backup outbound interface for the service?
- A. GE0/0/2
- B. GE0/0/3
- C. GE0/0/2 and GE0/0/3
- D. There is no backup outbound interface.
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Step 1: Identify the Primary Path
* The shortest OSPF cost to 10.0.3.3/32 from R1 is through R5:
* R1 # R5 (Cost 10) # R3 (Cost 10) = Total Cost 20
* The primary outbound interface from R1 to R5 is GE0/0/1.
Step 2: Identify the Backup Path (OSPF IP FRR & ECMP)
* OSPF IP Fast Reroute (FRR) provides a backup next-hop in case the primary link (R1 # R5) fails.
* A feasible backup path must have a cost equal to or close to the primary path, but it must avoid the same failure point.
Alternative Path Calculation:
* Path 1 (R1 # R2 # R3)
* R1 # R2 (Cost 10), R2 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/2 on R1.
* Path 2 (R1 # R4 # R3)
* R1 # R4 (Cost 10), R4 # R3 (Cost 10) # Total Cost = 20 #
* Uses interface GE0/0/3 on R1.
Final Decision on the Backup Interface
* Since both paths R1 # R2 # R3 and R1 # R4 # R3 have equal costs, either can be used for backup.
* However, R1 # R2 # R3 shares a direct cost path with R5, meaning it may not be preferred as a full FRR backup.
* The best backup outbound interface in this scenario is GE0/0/3 (R1 # R4 # R3).
Final answer: # C (GE0/0/3)
References:
* HCIP-Datacom-Advanced Routing & Switching Technology V1.0 - OSPF IP FRR (Fast Reroute) Mechanism
* OSPF Equal-Cost Multi-Path (ECMP) and Backup Route Selection
* OSPF Route Calculation and Best-Path Selection
NEW QUESTION # 100
On the OSPFv3 network shown in the figure:
* OSPFv3 is enabled on the interfaces connecting R1, R2, and R3.
* The router ID of each router is 10.0.X.X, where X is the number of the router.
* If you check detailed information about an LSA on R3, the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Router-LSA.
Is this statement TRUE or FALSE?
- A. TRUE
- B. FALSE
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the LSA Table in the Figure
The LSA Type displayed in the LSDB of R3 is an Intra-Area-Prefix-LSA (Type 9), with the following attributes:
* LS Type: Intra-Area-Prefix-LSA (Type 9)
* Link State ID: 0.0.0.1
* Originating Router: 10.0.2.2 (R2)
* Referenced LSA Type: 0x2001 (Router-LSA, Type 1)
* Referenced Link State ID: 0.0.0.0
* Referenced Originating Router: 10.0.2.2 (R2)
* Prefix: 2000:2::/128
Analysis of the Statement
* What is an Intra-Area-Prefix-LSA (Type 9)?
* Used in OSPFv3 to advertise IPv6 prefixes associated with a Router-LSA (Type 1) or Network-LSA (Type 2).
* Each router generates its own Router-LSA (Type 1) and references it in an Intra-Area- Prefix-LSA (Type 9).
* How does this apply to R3's LSDB?
* The LSA is generated by R2 (10.0.2.2), meaning R2 originated the prefix advertisement.
* The referenced LSA is a Router-LSA, indicating that the IPv6 prefix is associated with R2's router advertisement.
* Since R3 sees this LSA in its LSDB, it means R2 has advertised its IPv6 prefix (2000:2::
/128) into the OSPFv3 domain.
# Since the LSA describes an IPv6 prefix associated with R2's Router-LSA, the statement is TRUE.
Final Conclusion:
# The LSA is generated by R2 and describes the IPv6 prefix associated with the Router-LSA.# Thus, the correct answer is: A. TRUE.
NEW QUESTION # 101
A network device has established an OSPF neighbor relationship with another device. The figure shows the configuration of GE0/0/0 on the network device.
Which of the following commands would NOT affect the OSPF neighbor status of the interface?
- A. undo description
- B. undo ip address 10.0.12.2 24
- C. undo ospf dr-priority
- D. undo ospf cost
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:
To determine the correct answer, we need to analyze how each command impacts OSPF neighbor relationships.
1. Understanding OSPF Neighbor Formation
OSPF routers form neighbor relationships when they meet the following conditions:
* They are in the same subnet (IP addresses and subnet masks must match).
* They are in the same OSPF area.
* They use the same network type (e.g., Broadcast, Point-to-Point).
* Authentication (if configured) must match.
* Hello and Dead timers must match.
2. Analyzing Each Answer Option
# A. "undo ip address 10.0.12.2 24" # Affects OSPF Neighbor Status
* Removing the IP address will prevent the interface from sending and receiving OSPF Hello packets.
* Without an IP address, OSPF cannot establish neighbor relationships.
* Effect: Breaks OSPF neighbor status.
# B. "undo description" # Does NOT Affect OSPF Neighbor Status
* The interface description is just a label for administrators and has no impact on OSPF functionality.
* It does not affect neighbor relationships, routing, or communication.
* Effect: No impact on OSPF neighbors.
# C. "undo ospf cost" # Affects OSPF Neighbor Status Indirectly
* OSPF cost determines the path selection but does NOT break the neighbor relationship.
* However, if the cost change leads to routing table recalculations, it might cause temporary convergence issues.
* Effect: Does not directly break neighbor status, but affects route selection.
# D. "undo ospf dr-priority" # Affects OSPF Neighbor Status (Possibly Causes DR Re-Election)
* OSPF DR/BDR election uses priority values.
* If changed, a new election might occur, leading to a temporary loss of neighbor relationships.
* Effect: Might cause OSPF neighbor reset (temporary impact on adjacency).
NEW QUESTION # 102
IEIF has extended the functions of OSPF by taking advantage of the strong scalability of OSPF. To enable it to support IPv6 networks, the expanded protocol is called OSPFv3, and OSPFv3 is compatible with OSPFv2.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION # 103
The cutover risk assessment mainly considers which of the following aspects?
- A. Location of key risk points
- B. Scope of Risk Impact
- C. time of risk
- D. loss from risk
Answer: A,B,C,D
NEW QUESTION # 104
A campus has deployed IPv6 for service testing. There are 4 routers in the network, running 0SPFV3.
Interconnection of IPv6 networks. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of them Link-LSAs. Which of the following statements is true about the description of this LSA?
- A. ShouldLSAshowR2External routing is not supported, but participatingIPv6route calculation
- B. R2interfaceGEO/O/OThe link-local address force:FE80::2E0;FCFF:FEC, D:4F79
- C. R2interfaceGE0/0/0IPV6address prefix:2001:2343:23: :/64
- D. produce theLSAThe router isR2
Answer: B,C,D
NEW QUESTION # 105
As shown in the figure, Client1 and Client2 act as clients of RR1 and RR2 at the same time, RR1 and RR2 are in the same Cluster, and R has introduced 10 routes. Assume that the BCP configuration is correct.
The neighbor relationship has been established. How many routing entries are there in the BGP routing table of Client2 ultimately?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 106
IGP converges faster than BGP, which may cause network traffic loss. By enabling the OSPF and BGP linkage feature of the device, the device can keep the OSPF and BGP linkage during the set linkage time.____The router makes the link metric value in the LSA advertised to be the maximum value, so as to inform other OSPF devices not to use this router to forward data, so as to avoid traffic loss. (Note: If English letters are involved, all uppercase)
Answer:
Explanation:
STUBROUTER
NEW QUESTION # 107
multiple equal-cost routes may appear. About the IS-IS network , which of the following descriptions is false?
- A. If load sharing is configureD. the traffic will be evenly distributed to each link
- B. For each route in the equal-cost route, a priority can be specifieD. and the route with higher priority will be preferred. the rest as backup routes
- C. After configuring equal-cost route priorityJS-ISWhen the device forwards the traffic reaching the destination network segment, it will not adopt the load balancing methoD. but forward the traffic to the next hop with the highest priority
- D. When the number of equal-cost routes in the network is greater than the number configured by commands, and these routes have the same priority, the next-hop device is preferredSystem IDLarge routes for load balancing
Answer: C
NEW QUESTION # 108
Regarding the MPLS forwarding process, which description of the ingress node forwarding is correct? (Multiple choice)
- A. Check the NHLFE entry, you can get the outgoing interface, next hop, outgoing label, and label operation type. The label operation type is Push
- B. Press the obtained label in the IP packet, and process EXP according to the QoS policy, and process L at the same time, and then send the encapsulated MPLS packet to the next hop
- C. Find the corresponding NHLFE entry according to the Tunnel ID of the ILM table, and associate the LFlB entry with the NHLFE entry
- D. After receiving the data packet, the Ingress node will first check the ILM table to find the Tunnel ID
Answer: A,B
NEW QUESTION # 109
On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2.
In AS 65000, R1, R3, R4, and R6 each establish iBGP peer relationships with R2 and R5. R2 and R5 are Route Reflectors (RRs), and R1, R4, R3, and R6 are clients.
The iBGP peer relationships are established using Loopback0. The IP address of Loopback0 on each router is 10.0.X.X/32, and the router ID is 10.0.X.X, where X is the number of the router.
R1 and R4 import the external route 192.168.1.0/24 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0/24 to BGP through the import-route command.
Which of the following statements are true?
- A. The routing table of R4 contains two equal-cost default routes.
- B. The routing table of R1 contains the route 192.168.2.0/24.
- C. The route 192.168.2.0/24 in the routing table of R4 has two next hops.
- D. The routing table of R1 contains two equal-cost default routes.
Answer: B,C
Explanation:
Comprehensive and Detailed In-Depth Explanation:
Understanding the BGP and IS-IS Network Topology in the Question:
* IS-IS Areas:
* Area 49.0001 (Level-1 IS-IS): Contains R1, R2, R4, R5.
* Area 49.0002 (Level-2 IS-IS): Contains R3, R6.
* R2 acts as an ABR (Area Border Router) and redistributes routes between Level-1 and Level-2 using import-route isis level-2 into level-1.
* BGP Route Reflection & Peering:
* R2 and R5 are Route Reflectors (RRs).
* iBGP peering is established among all routers (R1, R2, R3, R4, R5, R6).
* R1 and R4 import 192.168.1.0/24 into BGP, meaning this prefix will be advertised to all iBGP peers.
* R3 and R6 import 192.168.2.0/24 into BGP, meaning this prefix will also be advertised to all iBGP peers.
Route Distribution Analysis:
A: The route 192.168.2.0/24 in the routing table of R4 has two next hops. # (Correct)
* R3 and R6 import 192.168.2.0/24 into BGP.
* R2 and R5 (Route Reflectors) learn this route and reflect it to their clients (R1, R3, R4, R6).
* R4 receives two valid paths to 192.168.2.0/24 via R2 and R5 (both iBGP peers).
* Since both routes have the same BGP attributes and cost, they are installed as equal-cost paths in R4's routing table.
# Statement A is correct: The routing table of R4 has two next hops for 192.168.2.0/24.
B: The routing table of R1 contains two equal-cost default routes. # (Incorrect)
* In an IS-IS Level-1-2 setup, default routes are usually provided to Level-1 routers from an ABR (like R2).
* However, the question does not mention that R1 is receiving two default routes or that it is in an equal-cost multipath (ECMP) scenario.
* R1 may have only one default route, depending on route preference and cost.
# Statement B is incorrect: The routing table of R1 does not necessarily contain two equal-cost default routes.
C: The routing table of R4 contains two equal-cost default routes. # (Incorrect)
* Similar to R1, R4 is also a Level-1 router in IS-IS.
* If R4 were receiving default routes from multiple ABRs (R2 and R5), then it could have equal- cost paths.
* However, there is no indication that R4 is receiving two default routes in this scenario.
# Statement C is incorrect: The routing table of R4 does not necessarily contain two equal-cost default routes.
D: The routing table of R1 contains the route 192.168.2.0/24. # (Correct)
* R3 and R6 import 192.168.2.0/24 into BGP.
* R2 and R5 (Route Reflectors) reflect this route to their iBGP peers, including R1.
* Since R1 is an iBGP client of R2 and R5, it will receive 192.168.2.0/24 and install it in its routing table.
# Statement D is correct: The routing table of R1 contains the route 192.168.2.0/24.
Final Conclusion:
# A. The route 192.168.2.0/24 in the routing table of R4 has two next hops.# B. The routing table of R1 does not necessarily contain two equal-cost default routes.# C. The routing table of R4 does not necessarily contain two equal-cost default routes.# D. The routing table of R1 contains the route
192.168.2.0/24.
Thus, the correct answers are: A, D.
NEW QUESTION # 110
Network administrator A wants to use A, CL to match only the four routing entries 1 and 3.57 in the figure. Ask the network administrator A at least how many A, CL rules do you need to configure?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 111
A company consists of a head office and two branch offices, and uses MPLS VPN technology to transmit private network routes. In the networking mode of HuB&Spoke. Branches can only send and receive routes to and from the head office, and branches cannot directly send and receive routes to each other. In order to achieve the above requirements, which of the following schemes can the setting of RT be?
- A. head officeImport Target:l:l;Export Target: 3:3OBranchl:Import
Targeta:3:3;Export Target: l:loBranch2:Import Target: 3:3; Export Target:2:2 - B. head office:Import Target 12:3; Export Targetr 3:12OBranchl:Import Target,3:12;Export Target 12:3OBranch2:Import Target: 3:12: Export Target: 12:3
- C. head office:Import Target 1:1, 2:2;Export Target: 3:3OBranchl:Import Target:3:3; Export Target: l:loBranch2:ImportTarget:3:3; Export Target:2:2
- D. head office:Import Target: 2:2;Export Target:3:3oBranchl:Import Target:
3:3.Export Target: l:loBranch2:ImportTarget: 3:3; Export Target.2:2
Answer: B,C
NEW QUESTION # 112
......
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