Latest HCIP-Datacom H12-831_V1.0-ENU Sample Questions & Answers

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Page 1 of 8

1. In order to speed up the perception of link failures in the IS-IS network, IS-IS can be linked with BFD.

TRUE

FALSE

2. ping -a X-c Y-s z -vpn-instance M 10.5.16.2, what is the meaning of this command? (Multiple choice)

The ping sends Y ICMP requests

The ICMP request of the ping, the packet size is Z (excluding IP and ICMP header)

The source IFP address of the ping packet is X

The ping packet belongs to VPN instance M

3. The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. Then, which of the following statements about Discovery message in the basic discovery mechanism is correct? (Multiple choice)

After the TCP connection is established, the LSR does not continue to send Hello Message

The destination IP address of the message is the multicast IP address 224.0.0.2

This message is encapsulated in a UDP message, and the destination port number is 646

The message is sent to the designated LDP Peer

4. According to this picture, what can we judge? (Multiple choice)

IS-IS IPv6 is not enabled on GE0/0/1 of R1

The IS-IS interface type of GE0/0/1 of R1 is Leve-1

The IS-IS interface type of the GE0/0/0 interface of R1 is Level-1-2

IS-IS IPv6 is enabled on GE0/0/0 of R1

5. There is the concept of forwarding equivalence class FEC in MPLS, which of the following description is wrong? (Multiple choice)

MPLS classifies packets with the same forwarding processing method into one category, which is called FEC

A forwarding equivalence FEC will be assigned a unique label value on all routers

The packets of the same FEC will be treated differently in the MPLS network

The division of FEC is very flexible. It can be based on any combination of source address, address, source port, destination port, protocol type or VPN, etc.

6. (Drag and drop) Please match the following DHCP attack types with corresponding explanations.

7. In an MPLS domain, LSR can be divided into Ingress LSR, Transit LSR and Egress LSR according to the way the LSR processes data. For the same FEC, a certain LSR can be the Ingress LSR of the FEC or the Transit LSR of the FEC.

TRUE

FALSE

8. Configuring DHCP Snooping can be used to prevent imitators from attacking. Which of the following steps should be included in the configuration process? (Multiple choice)

Enable the global DHCP Snooping function

Enable global DHCP function

Configure interface trust status

Enable DHCP Snooping on the interface or VLAN

9. What are the work that needs to be performed in the closing phase after the cutover acceptance is completed? (Multiple choice)

Transition training

Data transfer

Acceptance summary

On-site defense

10. Regarding multi-instance CE (Mlulti-VPN-Instance CE, MCE), which of the following description is wrong?

On the MCE device, you need to create separate routing and forwarding tables for different VPNs, and bind them to the correct interface

Users connected to the same MCE but not belonging to a VPN instance cannot access each other

Devices with MCE function can access multiple VPN instances in BGPIMPLS IP VPN applications, reducing user investment in network equipment

There must be multiple physical links between MCE and PE to achieve isolation between different VPIN instances

Page 2 of 8

11. In OSPFv3, the LSA whose propagation range is an area has () types. (Fill in Arabic teaching characters only)

12. Please sort by the cutover execution steps.

After the cutover is completed, observe the status of the network on the new device

Perform business inspections on new equipment

Cut over business from old equipment to new equipment

Install new equipment and configure

After ensuring the normal business operation of the new equipment, the old equipment goes offline

13. 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.

TRUE

FALSE

14. As shown in the figure:

IS-Leve1 of R3 and R1 do not match

R3 and R1 have different area codes

The IIH certification of R3 and R1 failed

The System ID of R3 and R1 are duplicated

15. Which of the following are not included in the security protection actions that a secure MAC address can perform?

Protect

Restrict

Shutdown

Remark

16. In order to publish IPv6 routes in BGP4+, what fields are added in Update?

A new NLRI type, IPv6_NLR, which carries IPv6 NLRl prefix length and IPv6 NLRl prefix

A new path attribute: MP_UNREACH_NLRl

A new path attribute: MP_REACH_NLRI

A new path attribute: IPv6_REACH_NLRI

17. BGP4+ carries the next hop address of the IPv6 route through the Next Hop attribute in the Update message.

TRUE

FALSE

18. According to this figure, it can be known that in VLAN300, 0 MAC drift occurred by 00e0-fc3d-3bdb from 17:22:38 to 17:22.44 on 2020-06-04.

65535

300

19. IGP converges faster than BGP, which may cause network traffic loss. By enabling the OSPF and BGP linkage feature of the device, the device remains as a () router within the set linkage time, so that the link metric value in the advertised LSA is the maximum value, thereby telling other OSPF devices not to use this router to forward data, so as to avoid the loss of traffic. (Note: If English letters are involved, all capitals are required)

20. Regarding BGP/MPLS IPVPN data forwarding, which of the following descriptions is wrong?

When data is transmitted on the BCP/MPLS IPVPN backbone network, it always carries two layers of labels

The inner label during data forwarding is assigned by MP-BGP

The outer label during data forwarding can be allocated by LDP

The data sent by the PE to the CE is an IPv4 packet

Page 3 of 8

21. Which of the following commands can be used to view BGP VPNv4 routing and BGP private network routing information on PE?

display bgp routing-table address-family vpnv4

display bgp vpnv4 routing-table

display bgp routing-table ipv4-family vpnv4

display vpnv4 bgp routing-table

22. IS-IS supports multi-instance and multi-process, that is, on an IS-IS router. You can configure multiple VPN instances to be associated with multiple IS-IS processes.

Which of the following descriptions about IS-IS multi-instance and multi-process are correct? (Multiple choice)

One IS-IS process can only be associated with one VPN instance

If an IS-IS router creates multiple IS-IS processes, each process does not affect each other and is independent of each other

One IS-IS process can be associated with multiple different VPN instances

A VPN instance can be associated with multiple different IS-IS processes

23. When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear.

Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?

When the number of equal-cost routes in the networking is greater than the number configured through commands, and the priorities of these routes are the same, the route with the higher System ID of the next hop device is preferred for load sharing

If negative arbitration sharing is configured, the traffic will be evenly distributed to each link

After the equal-cost routing priority is configured, when the IS-IS device forwards the traffic that reaches the destination network segment, it will not adopt the load sharing method, but will forward the traffic to the next-hop with the highest priority.

For each route in the equal-cost route, the priority can be specified, and the route with the higher priority will be preferred. The rest are used as backup routes

24. During the process of viewing the debug output through the SSH terminal, a lot of information pops up. Which of the following operations can make the Moni tor terminal no longer pop up the debug message? (Multiple Choice)

Exit the current Moni tor interface, log in to the device again using SSH to open the new Monitor interface

Open the notepad, enter undo debugging all, copy the command line, and paste it into the Monitor interface

Open the notepad, enter undo terminal monitor, copy the command line, and paste it into the monitor interface

Open the notepad, enter undo terminal debugging, copy the command line, and paste it into the Monitor interface

25. Which of the following statements about the freeway of LDP label retention is correct? (Multiple choice)

Need more memory and label space

Keep all labels distributed by neighbors

Only keep labels from next-hop neighbors, discard all labels sent by non-next-hop neighbors

Save memory and label space

26. Regarding BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?

The egress PE can send IPv4 routes to the remote CE through BGP, IGP or static routing

After the egress PE receives the VPNv4 route advertised by the ingress PE, it filters the VPNv4 route according to the RT attribute carried by the route

The exchange between PE and CE is IPv4 routing information

The ingress PE changes the IPv4 route received from CE to VPNv4 route, and saves it according to different VPN instances

27. Which of the following statements about 1S-IS (IPv6) is correct? (Multiple choice)

To support the processing and calculation of IPv6 routing, IS-IS added NLPID to 129 TLV

IS-IS working at the data link layer only needs to add a new TLV to support Pv6

To support the processing and calculation of IPv6 routes, IS-IS has added TLV232236

By default, IS-IS enables the multi-topology feature

28. What is the flooding scope in OSPFv3 for the LSA in the entire autonomous system?

Link-LSA

As-external-LSA

Inter-Area-Prefix-LSA

Intra-Area-Prefix-LSA

29. By default, which of the following secure MAC address types will be lost after the device restarts?

Black hole MAC address

Sticky MAC address

Secure dynamic MAC address

Secure static MAC address

30. According to this picture, what can we judge? (Multiple choice)

R1's GE0/0/1 must have Leve1-2 capability

R1's GE0/0/0 must have the Leve1-2 capability

There must be an LSDB of Leve1-2 on R1

R1 has 2 IS-IS neighbors

Page 4 of 8

31. As shown in the figure, a sham link is established between PE1 and PE2 through the LoopBackD interface. CE2 can learn the route to the 192.168.1.0/24 network segment (the direct route on CE1) through the sham link and backdoor link. If you keep the default configuration, the cost value of the route from CE2 to the 192.168.1.0/24 network segment should be (). (Please fill in the Arabic numerals directly, without symbols)

32. What is the meaning of the display current-configuration I include vlan command?

View the physical interface information bound to each VLAN

Check which VLANs are currently created

View the IP address of the VLANIF interface

View all configurations that contain the "VLAN" keyword

33. In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain all the labels distributed by the LDP Peer, regardless of whether the LDP Peer is the optimal next-hop to reach the target network segment.

TRUE

FALSE

34. The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. Then, which of the following statements about Discovery message in the basic discovery mechanism is correct? (Multiple choice)

After the TCP connection is established, the LSR does not continue to send Hello Message

The destination IP address of the message is the multicast IP address 224.0.0.2

This message is encapsulated in a UDP message, and the destination port number is 646

The message is sent to the designated LDP Peer

35. According to this picture, what can we judge? (Multiple choice)

R4 belongs to Leve1-2 only

The device whose system-ID is ee8c. a0c2.baf2, and its type is Level-1-2

The device with system-ID ee8a0c2.baf2, its type is Leve1-1

R4 belongs to Level-1 only

36. A certain park deployed both IPv4 and IPv6 networks for service testing, and IS-IS was run to achieve network interconnection. IS-IS routing protocol has good scalability and is widely used in existing networks.

Regarding IS-IS scalability, which of the following statements are correct? (Multiple choice)

IS-IS uses TLV structure to construct messages, which makes IS-IS more flexible and expandable

For IS-IS, adding new features only needs to add a new TLV

IS-IS needs to add TLV to carry Pv6 address information in order to support PV6

NLPID is a new TLV of IS-IS to support IPv6

37. As shown in the figure, the network has caused a loop because STP is not enabled. Which of the following phenomena may be caused? (Multiple choice)

A large number of broadcasts can be received on the Host

The device will have a loop alarm

The device CPU usage is too high

MAC address table flapping

38. OSFFv2 is an IGP running on an IPv4 network: OSPFV3 is an IGP running on an IPv6 network. Compared with OSPFv2, SPFV3 has a similar LSA type, but the function is slightly different. Which of the following is not included in the LSA type of OSPFv3?

AS-External-LSA

Router-LSA

ASBR-Summary-LSA

Network-LSA

39. Which of the following statement is wrong?

LSPs established by statically assigning labels can also be dynamically adjusted according to changes in the network topology, without administrator intervention

The principle to be followed for manual label allocation is: the value of the outgoing label of the upstream node is the value of the incoming label of the downstream node

LSP is divided into static LSP and dynamic LS

The static LSP is manually configured by the administrator, and the dynamic LSP is dynamically established using the label protocol

Dynamic LSP is dynamically established through label distribution protocols, such as MP-BGP, RSVP-TE, LDP

40. What is the purpose of configuring LSP fragmentation for IS-IS equipment?

Make the device unable to establish IS-IS neighbors

Allow the device to support more IS-IS routing entries

Make the device unable to learn IS-IS routing information

No practical purpose

Page 5 of 8

41. As shown in the figure, MPLS/BGP IPVPN is deployed in the network. The MP-BGP neighbor relationship is established between PE1 and PE2 through the LoopbackD interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 to query neighbor information as shown in the figure. What is the most likely cause of the problem?

The VPN instance parameters on PE1 or PE2 are incorrectly configured

PE1 and PE2 are not enabled with neighbors in the BGP-VPN4 unicast address family view

The LSP tunnel between PE1 and PE2 is not established

The routing protocol configuration between PE1 or PE2 and the respective CE is incorrect

42. What is the default aging time of the MAC address table of Huawei switches in seconds?

300

500

400

43. As shown in the figure, a certain park has deployed IPv6 for service testing, and there are 4 routers in the network. Run OSPFv3 to realize network interconnection.

Regarding the LSA generated by the OSPFv3 network, which of the following statements is wrong?

R1 itself will generate Router-LSA to describe device interface information, and will receive Router-LSA generated by R2 and R3 at the same time

There is a Network LSA generated by R3 in the LSDB of R1, indicating that R3 may be the DR of this link

R1 will receive the two Link-LSAs generated by R2, describing the two links information connected to R2 respectively

As an ABR, R2 will generate Inter-Area-Prefix-LSA describing the IPv6 address prefix of Area 1, and advertise it to R1 and R3

44. Which of the following series can be matched by the regular expression 100.S? (Multiple choice)

100

1000

10000

1001

45. After configuring the VLAN-based MAC address drift detection function, if the MAC address drifts, you can configure the actions of the interface according to your needs.

Which of the following is not a configurable action?

Flow filtering

Send alert

Interface blocking

MAC address blocking

46. Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?

The device type of R1 is Level-2

The device type of R1 cannot be determined

The device type of R1 is Leve1-1

The device type of R1 is Level-1-2

47. Which of the following tools cannot be used to match BGP routing entries?

Community Filter

Advanced ACL

Basic ACL

IP Prefix List

48. In the VLAN aggregation technology, multiple Sub-VLANs are used to isolate the wide recruitment area, and these Sub-VLANs are aggregated into a logical Super-VLAN. A company divides different departments into different Sub-VLANs because of the Sub-VLAN. VLAN not only includes physical connections, but also can establish a three-layer VLANIF interface, which can directly communicate with the external network on the three-layer.

TRUE

FALSE

49. The IS-IS neighbor between R3 and R1 is not established. According to the information in this figure, what is the possible cause?

The IIH certification of R3 and R1 failed

The System ID of R3 and R1 are duplicated

The lS-Level of R3 and R1 do not match

The circuit-type of the interconnection interface between R3 and R1 does not match

50. In the finishing work of the structured network troubleshooting process, which of the following are the documents that need to be handed over? (Multiple choice)

Maintenance suggestions to avoid the failure

Troubleshooting summary report

Troubleshooting process documentation

Page 6 of 8

51. 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 device's Loopback 0 port. R1, R2, R3EJLoopbacD are advertised in area 1, and Loopbacfk D of R4 is advertised in area D, the Loopback D of R5 is advertised in area 2. Which of the following addresses can ping each other?

10.0.3.3 and 10.0.5.5

10.0.4.4 and 10.0.2.2

10.0.2.2 and 10.0.3.3

10.0.2.2 and 10.0.5.5

52. In the intra-domain MPLS VPN network, when the data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Regarding the description of the two layers of labels, which of the following options is wrong?

The outer label of MPLS VPN is allocated by the LDP protocol or statically, and the inner label is allocated by the MP-BGP neighbor at the correct end.

The outer label of MPLS VPNE is called the private network label, and the inner label is called the public network label.

By default, the outer label is singled out before the packet is forwarded to the last hop device

The outer label is used to correctly send the data packet to the corresponding VPN on the PE device

53. The RR rules for advertising routes break the IBGP split horizon rules, so it may cause loops in the AS. What routing attributes does RR use to prevent loops? (Multiple choice)

Cluster List

Originator ID

Next hop

AS-PATH

54. Regarding the IPSG, which of the following statement is incorrect?

IPSG can prevent IP address spoofing attacks

IPSG is a source IP address filtering technology based on the three-layer interface

IPSG can turn on the IP packet inspection and alarm function, and cooperate with the network management to perform alarms

IPSG can prevent the host from changing the IP address privately

55. As shown in the figure, all routers run OSPF.

Which of the following statements is correct?

R2 generates Router LSA in both area 1 and area 0

R2 forwards the Router LSA generated by R3 to R1

R2 forwards the Router LSA generated by R1 to R3

R2 only generates Router LSA in area 0

56. OSPFv2 is an IGP running on an IPv4 network, OSPFvV3 is an ICP running on an IPv6 network. OSPFv3 and OSPFv2 have the same message types, including Hallo messages, DD messages, LSU messages, LSU messages and SACK messages.

Regarding OSPFv3 packets, which of the following statements is correct?

OSPFv3 uses the authentication field in the header of the message to complete message authentication

OSPFv3 uses the link-local address as the source address of the sent message, and the message can be forwarded outside the range of the originating link

OSPFv3 uses IPv6 multicast addresses FFO2::5 and FFO2:.6 to send OSPFv3 packets

The He11o packet of OSPFv3 carries the IPv6 address prefix list of the router interface

57. (Drag and drop) As shown in the figure, there is a message containing three-layer label headers. Please select the corresponding values of the X, Y, and Z fields in the figure. (Decimal)

58. Traditional BGP-4 can only manage IPv4 unicast routing information. In order to provide support for multiple network layer protocols, MP-BGP extends BGP-4.

MP-BGP uses address families to distinguish different network layer protocols. Which of the following address families are currently supported? (Multiple choice)

BGP-VPNv4 address family

BGP-IPv6 unicast address family

BGP-IPv4 broadcast address family

BGP-MP instance IPv6 address family

59. If you want to check files under Flash, which command should use?

dir sdl:

dir sd0:

display patch-information

dir flash:

60. Which packets can Huawei equipment perform traffic suppression for? (Multiple choice)

unknown Unicast

Known unicast

Multicast

Broadcast

Page 7 of 8

61. BGP/MPLS IP VPN can only use LDP to construct public network free channels.

TRUE

FALSE

62. Regarding the BGPI MPLS IPVPN network architecture, which of the following descriptions is wrong?

The P device only needs to have basic MPLS forwarding capabilities and does not maintain VPN related information

Sites can visit each other through VPN, and a site can only belong to 1 VPN

Under normal circumstances, CE equipment does not perceive the existence of VPN, and CE equipment does not need to support MPLS, MP-BGP, etc.

The BGP/MPLS IP VPN network architecture consists of three parts: CE (Customer Edge), PE (ProviderEdge), and P (Provider). PE and P are operator equipment, and CE is BGP/MPLS IPVPN user equipment.

63. Qing technology is a technology that expands the VLAN space. It achieves the function of expanding the VLAN space by adding a layer of 8D2.1Q Tag on the basis of the 8Q2.12 tag message.

Which of the following statements about qinq is wrong?

Flexible QinQ can add different outer tags according to different inner tags, which is more precise in the division of user VLANs.

QinQ increases the number of VLANs to 4095*4095

QinQ technology can make the private network LAN transparently transmitted on the public network

Basic QinQ is implemented based on the interface method

64. In an MPLS network, SR running the DP protocol exchange LDP messages to realize functions such as neighbor discovery, session establishment and maintenance, and label management. In order to ensure the reliability of message delivery, all sending and receiving of LDP messages must be based on TCP connections.

TRUE

FALSE

65. Which of the following is wrong about DHCP Snooping?

DHCP Snooping can prevent illegal attacks by setting trusted ports (all interfaces are untrusted by default)

Enable DHCP Snooping globally, without any post parameters, the device only processes DHCPv4 messages by default

Enable the DHCP Snooping function in the interface view, then all the DHCP message command functions under the interface will take effect

Enable the DHCP Snooping function in the VLAN view, and the command function of DHCP messages belonging to the VLAN received by all interfaces of the device will take effect

66. Which of the following information can the DHCP binding table contain? (Multiple choice)

Port and UDP port

MAC address

IP address

Lease time

67. Regarding MP-BGP, whici of the following description is incorrect?

When the PE and CE exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE

MP-BGP's message type and VPNv4 routing policy are the same as BGP-4

MP-BGP needs to assign private network labels to VPNv4 routes

MP-BGP advertises VPNv4 routes through two attributes: MP_REACH_NLRI and MP_UREACH_NLRI

68. How to view log information? (Multiple choice)

View the interface of the network management system

There is no way

Transfer the log file under flash:/logfile/ to the PC via FIP/TFTP

69. After a fault occurs, it is necessary to collect and backup various fault information in time as a reference for handling the fault. In addition, when seeking emergency help from Huawei Technologies Co., Ltd., you need to provide the fault information to Huawei Technologies Co., Ltd. technical support personnel to facilitate their location and troubleshooting.

70. A park deployed IPv6 for business testing. There are 4 routers (R1, 22, R3 and R4) in this network, running OSPFv3 to realize the interconnection of IPv6 network. There is a new router R5 that needs to be connected to the network for testing. An engineer introduced a direct route in the OSPFvV3 process of R4 to realize that the devices in the campus network can access the GE0/0/1 port address of R5. Which of the following descriptions of the scene are correct? (Multiple choice)

R2 will generate a Type4 LSA and only flood in Area 0

R4 will generate an IPv6 routing prefix introduced by Type5 LSA description

R2 will generate a Type4 LSA describing the Router ID of R4

R4 will generate a Type5 LSA and only flood in Area 1

Page 8 of 8

71. When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice)

Confirm that the network layer service flow is a path

Investigate business meteor path planning in the network design stage

Confirm the data link layer service traffic path