[Jun 26, 2023] Pass HCIP-Datacom H12-821_V1.0-ENU Exam With 966 Questions
Ultimate Guide to Prepare Free Huawei H12-821_V1.0-ENU Exam Questions and Answer
The Huawei H12-821_V1.0-ENU (HCIP-Datacom-Core Technology V1.0) Exam is an industry-leading certification exam that focuses on the core technologies of data communication. This certification exam is designed for IT professionals who are looking to advance their expertise and knowledge in the field of data communication. The exam covers a wide range of topics, including network architecture, network protocols, network security, and network management.
NEW QUESTION # 21
By default, VRRP of Huawei AR routers runs in preemptive mode.
- A. False
- B. True
Answer: B
NEW QUESTION # 22
Which of the following statements about DHCP Server denial of service attacks are correct? (Multiple choice)
- A. DHCP denial of service attacks consume address resources by continuously modifying the CHADDR field in the DHCP request message
- B. DHCP denial of service attack consumes address pool resources by controlling a large number of terminals to send address request messages at the same time
- C. DHCP denial of service attacks will quickly exhaust the IP address resources in the DHCP address pool
- D. After the DHCP server address resources are exhausted, it will no longer process and respond to DHCP request messages.
Answer: A,C,D
NEW QUESTION # 23
RSTP defines 4 port roles, among which the part role value in the flags field of the Alternative port and the Backup port in the STP message is always 01.
- A. False
- B. True
Answer: B
NEW QUESTION # 24
Which of the following description about VRRP is wrong?
- A. A virtual router consists of a main router and several backup routers. The main router implements the real forwarding function. When the main router fails, a backup router will become the new main router and take over its work
- B. When using the protocol, you need to configure the virtual router number and virtual IP address on the router, and directly use the real MAC of the main router, so that a virtual router is added to the network
- C. VRRP is a redundant backup protocol designed for local area networks (such as Ethernet) with multicast or broadcast capabilities. Instead, thereby maintaining the continuity and reliability of network communications
- D. The host on the network communicates with the virtual router without knowing all the information about the physical router on the network
Answer: B
NEW QUESTION # 25
The RSTP protocol provides a variety of protection functions. For example, when the edge port is configured in the protected state, after the edge port receives the BPDU message, what is the processing method?
- A. Directly discard BPDU packets
- B. Forward BPDU packets as required
- C. Get relevant information after BPDU message
- D. Close the port
Answer: D
NEW QUESTION # 26
Which description is correct about the prefix list? (Multiple choice)
- A. The prefix list can be used for packet filtering
- B. The prefix list is used to filter IP prefixes, which can match the prefix number and prefix length at the same time
- C. The prefix list cannot be used for packet filtering
- D. The prefix list is used to filter IP prefixes and cannot match the prefix number and prefix length at the same time
Answer: B,C
NEW QUESTION # 27
Part of the configuration of a router is shown in the figure, so which of the following descriptions about this part of the configuration is correct?
[HUAWEI] ip ip-prefix plpermit 10.0.192.0 8 greater-equal 17 less-equal 18
- A. In the 10.0.192.0/8 network segment, the route with a mask length of 20 will match the prefix list, and the matching rule is allowed
- B. In the 10.0.192.0/8 network segment, the route with a mask length of 21 will match the prefix list, and the matching rule is allowed
- C. In the 10.0.192.0/8 network segment, the route with a mask length of 18 will match the prefix list, and the matching rule is allowed
- D. In the 10.0.192.0/8 network segment, the route with a mask length of 19 will match the prefix list, and the matching rule is allowed
Answer: C
NEW QUESTION # 28
During the operation of DHCP, various message types will be exchanged, so which of the following messages are not sent from the client to the server?
- A. DHCP RELEASE
- B. DHCP REQUEST
- C. DHCP DISCOVER
- D. DHCP WANT
Answer: D
NEW QUESTION # 29
The statement about OSPF AS-External-LSA, which is correct? (Multiple choice)
- A. Link State ID is set as the destination network segment address
- B. Use Link State ID and Advertising Router to uniquely identify an AS-External-LSA
- C. Net mask is set to all 0
- D. Advertising Router is set to the Router ID of ASBR
Answer: A,D
NEW QUESTION # 30
If DR Priority is set to 0, then in the OSPF routing domain, the router is allowed to be elected as DR or BDR, but the priority is the lowest.
- A. False
- B. True
Answer: A
NEW QUESTION # 31
After the dual-system hot backup is configured, the main and backup channels cannot be established. The information on the active device cannot be backed up to the backup device normally, causing the dual-system hot backup function to be abnormal. The possible cause of the failure is? (Multiple choice)
- A. The priority of the two ACs is the same
- B. The source IP address and source port number of the local end are inconsistent with the destination IP address and destination port number of the opposite end
- C. The retransmission times and retransmission intervals of the primary and secondary service packets at both ends are inconsistent
- D. TCP channel is not established
Answer: B,C,D
NEW QUESTION # 32
ICMPv6 has two types of Error Messages and Information Messages.
- A. False
- B. True
Answer: B
NEW QUESTION # 33
Which of the following statements about multicast packet forwarding is correct?
- A. The IGMP Snooping function cannot control the range of multicast traffic flooding in the Ethernet
- B. In the multicast transmission mode, the destination address of the message can clarify the location of the receiver
- C. The source address of the multicast packet is a unicast address
- D. RPF check failure indicates that the multicast data packet is received from the sub-optimal interface, but the inbound interface will still receive the multicast traffic and forward it downstream
Answer: C
NEW QUESTION # 34
Which of the following protocols is generally used in Smurf attacks?
- A. DHCP
- B. BGP
- C. TCP
- D. ICMP
Answer: D
NEW QUESTION # 35
When OSPF external routes are imported, Metric-Type-1 or Metric-Type-2 will be used, so which of the following is the calculation method of the routing cost of Metric-Type-1 type?
- A. The sum of the cost from the nearest ABR to the ASBR and the cost from the ASBR to the destination address of the route
- B. The cost from this device to the corresponding ASBR
- C. Cost from the ASBR to the destination address of the route
- D. The sum of the cost from the device to the corresponding ASBR and the cost from the ASBR to the destination address of the route
Answer: D
NEW QUESTION # 36
Which description of the LACP protocol is correct? (Multiple choice)
- A. The devices at both ends determine the active interface according to the LACP priority and interface ID of the passive interface
- B. The devices at both ends determine the active end according to the system LACP priority and system D.
- C. Exchange information with the peer through LACPDU (LinkAggregationControlProtocolDataUnit)
- D. Based on IEEE802.3au standard.
Answer: B,C
NEW QUESTION # 37
Which layer of data packets does the packet filtering firewall inspect?
- A. Physical layer
- B. Application layer
- C. Network layer
- D. Link layer
Answer: C
NEW QUESTION # 38
As shown in the figure, the stateful inspection firewall will forward the second TCP three-way handshake message in the figure.
- A. False
- B. True
Answer: A
NEW QUESTION # 39
The default value of the ospfdr-prioritye command is 1, and the value range is 0~255.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 40
Use the IP prefix list as shown in the figure for route matching. Which of the following routes can be matched?
ip ip-prefix List1 index 10 permit 192.168.1.0 24 greater-equal 24 less-equal 27
- A. 192.168.1.0/23
- B. 192.168.3.0/25
- C. 192.168.2.0/24
- D. 192.168.1.0/27
Answer: D
NEW QUESTION # 41
The ABR in the NSSA area will not flood the Type 4 and Type 5 LSAs to the NSSA, but will flood the Type 7 LSAs to other areas.
- A. False
- B. True
Answer: A
NEW QUESTION # 42
As shown in the figure, there are the following configurations under BGP, which of the following descriptions are wrong? (Multiple choice)
[HUAWEI-bgp] timer keepalive 30 hold 90
[HUAWEI-bgp] peer 1.1.2 timer keepalive 10 hold 30
- A. Global configuration takes precedence, so the final result is that the timer value of peer 1.1.1.2 takes keepalive 30 hold 90
- B. Peer configuration takes precedence, so the final result is that the timer value of peer 1.1.1.2 takes keepalive 10 hold 30
- C. The default configuration is timer Keepalive 60 hold180, so pee r1.1.12 has a faster detection speed for Peer connection failure than the default value
- D. Timer takes the minimum value, so the final result is that the timer value of peer 1.1.1.2 takes keepalive10 hold 30
Answer: A,D
NEW QUESTION # 43
In network A, the two DRother devices will not establish an adjacency relationship, and their status will remain at 2-way.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION # 44
The first 4 bits of the IP multicast address are fixed 1110, corresponding to the upper 25 bits of the multicast MAC address. Of the last 28 bits of the IP multicast address, only 23 bits are mapped to the MAC address, so 5 bits of address information are lost. The direct result is that 32 IP multicast addresses are mapped to the same MAC address.
- A. False
- B. True
Answer: B
NEW QUESTION # 45
To implement the traffic filtering function, you can use traffic-flter or MQC. Compared with traffic-filter, MQC can be called in more views.
- A. False
- B. True
Answer: B
NEW QUESTION # 46
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