PDF問題（2025年最新）実際のHuawei H12-821_V1.0-ENU試験問題
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質問 # 234
The four routers run IS-IS and have established adjacency. The area numbers and router levels are marked in the figure. The link between R1 and R2 is a PPP link, and R2 is DIS. Which of the following statements is correct? (Multiple choice)
- A. R2 sends the LSP to R3 and R4 in unicast mode
- B. If R1 sends an LSP message, R2 needs to send PSNP for confirmation
- C. R3 periodically sends CSNP to help achieve Level-2 LSDB synchronization
正解：B、C
質問 # 235
Using NAT technology, only the network layer information (IP address) in the data packet can be translated.
- A. FALSE
- B. TRUE
正解：A
質問 # 236
The traditional packet loss strategy uses the tail drop (Taii-Drop) method. This drop method will cause the TCP global synchronization site.
- A. TRUE
- B. FALSE
正解：A
質問 # 237
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. True
- B. False
正解：A
質問 # 238
Which of the following description of the prefix list is wrong?
- A. The prefix list can match the prefix number and prefix length
- B. The prefix list has a stronger matching function for the routing mask than the access control list
- C. The prefix list can be used for packet filtering
- D. The prefix list can be used to filter IP prefixes
正解：C
質問 # 239
The content contained in the UPDATE message, which of the description is wrong?
- A. UPDATE contains information about withdrawing the routing prefix
- B. UPDATE contains the local AS number
- C. UPDATE contains reachable route prefix information
- D. UPDATE contains path attributes
正解：B
質問 # 240
Which of the following descriptions about the OSPF Stub area is wrong?
- A. If an area is to be configured as a Stub area, all routers in the area must be configured with Stub area attributes
- B. The backbone area (Area0) cannot be configured as a stub area
- C. ASBRs cannot exist in the stub area, that is, routes outside the autonomous system cannot be propagated in the stub area
- D. The cost of the default route sent to the Stub area cannot be configured
- E. Virtual connections cannot exist in the stub area
正解：D
質問 # 241
Which of the following descriptions of mirror ports are correct? (Multiple choice)
- A. A traffic policy containing flow mirroring behavior is applied on the interface. The mirror port is a port connected to the monitoring device and is used to output the packets copied from the mirror port.
- B. The implementation of the mirroring function requires cooperation with monitoring equipment. The monitoring equipment is mainly used to analyze the received mirroring messages.
- C. Analyzing and monitoring port flow mirroring is a type of traffic behavior. When applied on a device, it is actually performed globally, in a VLAN or on a terminal.
- D. Port mirroring means that the device copies a packet passing through the mirrored port and transmits the packet to the designated observing end.
正解：B、C、D
質問 # 242
There are a large number of employees in an enterprise building, and they usually start to connect to the company's WLAN network in the lobby when they go to work. As each employee walks to their respective workstations, each person's mobile terminal roams through roaming to their respective network coverage areas.
In order to ensure that the IP address of each terminal is fixed as much as possible, what is the recommended approach?
- A. Configure VLAN Pool and configure sequential algorithm
- B. Without configuring VLAN Pool, configure a static IP address for each mobile terminal
- C. Configure VLAN Pool and configure the algorithm arbitrarily
- D. Configure VLAN Pool and configure Hash algorithm
正解：A
質問 # 243
Which of the following descriptions about URPF (Unicast Reverse Path Forwarding) is correct?
- A. If strict mode URPF is deployed, as long as the packet can match the detailed route, the P address can be deemed legitimate and the packet can be forwarded.
- B. If you deploy loose mode URPF, no detailed route matching is required by default.
- C. If you deploy URPF in loose mode, if you need to check the default route, you need to check whether the interface matches
- D. After deploying strict mode URPF, you can also deploy it at the same time to allow matching the default routing mode.
正解：D
質問 # 244
A socket is composed of a 5-tuple, so which of the following options does not belong to the scope of the 5-tuple?
- A. Source IP
- B. Destination port
- C. Destination IP
- D. Source MAC
正解：D
質問 # 245
The router directs the forwarding of data according to the forwarding table.
- A. True
- B. False
正解：B
質問 # 246
Regarding the OSPF route aggregation command, which of the descriptions is correct? (Multiple choice)
- A. not-advertise is the default parameter of the abr-summary command, that is, if advertise is not specified in the abr-summary command, the default is not -advertis
- B. The abr-summary command is a command in OSPF area view
- C. The abr-summary command is a command in the OSPF view
- D. advertise is the default parameter of the abr-summary command, that is, if not-advertise is specified in the abr-sumary command, the default is advertise
正解：B、C、D
質問 # 247
Among the following BGP attributes, which ones are recognized and must be followed? (Multiple choice)
- A. Next hop
- B. Community
- C. Local_Pref
- D. AS_Path
- E. origin
正解：A、D、E
質問 # 248
ICMPv6 has two types: Error Messages and Information Messages.
- A. TRUE
- B. FALSE
正解：A
質問 # 249
Which of the following information is carried in the BGP OPEN message? (Multiple choice)
- A. BGP Router ID
- B. Routing attributes
- C. Hold time
- D. Local Autonomous System (AS) number
正解：A、C、D
質問 # 250
To enhance user access security, a company deployed MAC priority Portal authentication. As shown in the figure, please pair the following authentication steps in order.
正解：
解説：
質問 # 251
If the router-id is configured in both the system view and the BGP view of the router, since the BGP view has a higher priority, BGP uses the router-id in the BGP view.
- A. TRUE
- B. FALSE
正解：A
質問 # 252
Which of the following modules are usually included in the construction of a large-scale enterprise network? (Multiple choice)
- A. Transmission network
- B. Backbone network
- C. wireless network
- D. Data center network
- E. Storage network
正解：B、C、D
質問 # 253
A switch runs the RSTP protocol, and its related configuration information is shown in the figure. According to the command configuration, please point out that for Instance 1, the role of the switch is:
- A. Switch
- B. Unable to judge
- C. Non-root switch
- D. Root switch
正解：D
質問 # 254
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