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質問 # 64
Which of the following statements about roaming is correct? (Multiple choice)
- A. AP that realizes wireless roaming must have signal coverage overlapping areas
- B. AP that realizes wireless roaming must be in the same Extended Service Set (ESS)
- C. An AP that realizes wireless roaming does not need to have a signal covering the overlapping area
- D. The AP that realize wireless roaming must be in the same basic service set (BSS)
正解：A、B
質問 # 65
RSTP mid-side port does not need to wait for the forwarding delay and can directly enter the forwarding state. If the edge port receives BPDU, the edge port will be directly closed and enter the Aerodrome state.
- A. FALSE
- B. TRUE
正解：B
質問 # 66
In a route-policy, which of the following BGP attributes can be used in apply clauses?
- A. Tag
- B. MED
- C. AS_Path
- D. Local-Preference
正解：B、D
解説：
In a route-policy, attributes such as MED (Multi-Exit Discriminator) and Local-Preference can be used in apply clauses to influence BGP route selection. Attributes like AS_Path and Tag are typically matched or filtered but not directly applied in the apply clause .
質問 # 67
Which of the following statements is false, based on the following IGMP information on an interface of RTA?
- A. The IP address of the interface is 192.168.1.1.
- B. The maximum time for response to Query messages is 10s.
- C. The interval for sending group-specific Query messages is 60s.
- D. The IGMP version is IGMPV2.
正解：B
質問 # 68
RPF has the function of preventing loops in multicast.
- A. FALSE
- B. TRUE
正解：B
質問 # 69
The Origin attribute is used to define the origin of BGP path information. There are three types of Origin attributes. Which of the following lists the Origin attributes in descending order of priority?
- A. IGP > EGP > Incomplete
- B. Incomplete > IGP > EGP
- C. EGP > IGP > Incomplete
- D. Incomplete > EGP > IGP
正解：A
解説：
Comprehensive and Detailed Step-by-Step Explanation:
* BGP Origin Attribute Priority:
* The Origin attribute determines the source of the route and affects the selection of the best path.
* The priority order is as follows:
* IGP (i): Highest priority. Routes injected using the network command.
* EGP (e): Lower priority. Routes learned from the EGP protocol.
* Incomplete (?): Lowest priority. Routes redistributed into BGP from other protocols.
* Correct Option:
* A: IGP > EGP > Incomplete is the correct order of priority.
References:
* HCIA-Datacom Study Guide, Chapter: BGP Path Selection
* Huawei BGP Routing Rules
質問 # 70
As shown in the figure, the IS-IS neighbor relationship is established between the two routers.
Which of the following description about the process of establishing the neighbor relationship is correct? (Multiple choice)
- A. In the broadcast network, the DIS needs to be elected. After the adjacency relationship is established, the router will wait for the interval between two Hello messages before electing the DIS.
- B. In Down state, R1 unicast sends Level-1LANIIH, and the adjacency list in this message is empty
- C. In this broadcast network, R1 and R2 use a three-way handshake to establish an adjacency relationship
- D. R2 marks the adjacency state as Initial after receiving the IIH message sent by R1. Then, R2 replies to R1 with Level-1LANIIH, which identifies R1 as the adjacency of R2
正解：A、C、D
質問 # 71
What are the main types of IS-IS Hello messages? (Multiple choice)
- A. Level-2 LAN IIH
- B. P2P LAN IIH
- C. Level-1-2 LAN IIH
- D. Level-1 LAN IIH
正解：A、B、D
質問 # 72
Which of the following scenarios is the SD-WAN solution suitable for?
- A. Enterprise branch interconnection
- B. Enterprise campus wireless network deployment
- C. Internal interconnection of enterprise data center network
正解：A
質問 # 73
On an office network of an enterprise, OSPF is enabled on two directly connected routers. During adjacency establishment, the state machine stays in the 2-way state. Which of the following statements are not possible causes?
- A. The N-bit and E-bit of Hello packets are the same.
- B. Router IDs conflict.
- C. Hello time values are different.
- D. Area IDs are different.
正解：A、B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
OSPF State Machine:
OSPF adjacency progresses through several states:Down > Init > 2-Way > ExStart > Exchange > Loading > Full.
The2-Way stateindicates that routers have exchanged Hello packets but are not forming full adjacencies.
Possible Causes for Staying in the 2-Way State:
Hello Time Values Are Different (A):Mismatched Hello/Dead intervals prevent adjacency establishment.
Area IDs Are Different (B):OSPF routers must belong to the same area to establish adjacency.
Router IDs Conflict (C):While Router ID conflicts cause other issues, they do not result in the 2-Way state.
N-bit and E-bit Are the Same (D):Matching N-bit/E-bit values are normal and do not cause problems.
References:
HCIA-Datacom Study Guide, Chapter: OSPF Adjacency Establishment
Huawei OSPF Neighbor State Analysis
質問 # 74
Please sequence the process of allocating VLANs to terminals from the VLAN Pool.
- A. Determine the VLAN Poo1 bound to the VAP and the VLAN algorithm
- B. Assign VLAN to the terminal according to the JiangAN algorithm
- C. Terminal access to VAP
- D. The terminal accesses from the divided VLAN
正解：A、B、C、D
質問 # 75
On a WLAN, engineers can use the VLAN pool mechanism to assign access users to different VLANs, which helps reduce the number of broadcast domains and improve network performance. VLAN pools support two VLAN assignment algorithms: even and hash. Drag the advantages and disadvantages to the two algorithms.
(Token is reusable)
正解：
解説：
Explanation of VLAN Pool Assignment Algorithms:
In WLANs,VLAN poolshelp reduce broadcast domains and improve network performance by distributing users across multiple VLANs. Two algorithms are used for VLAN assignment:
Even Assignment Algorithm:
The number of users in each VLAN is even.
This algorithm assigns users evenly across VLANs, ensuring a balanced distribution of users in each VLAN.
When STAs go offline and online again, their VLANs and IP addresses may easily change.
Since the assignment is based on maintaining even distribution, a device (STA) may not be assigned the same VLAN when it reconnects, leading to potential IP address changes.
Hash Assignment Algorithm:
The number of users in each VLAN is uneven.
The hash algorithm assigns users to VLANs based on a hash value (e.g., derived from the MAC address). This may result in an uneven distribution of users across VLANs.
VLANs and IP addresses remain unchanged for STAs that go offline and online again.
The hash algorithm ensures that a device reconnects to the same VLAN, preserving its IP address.
A screenshot of a computer Description automatically generated
質問 # 76
The following figure shows the OSPF network of an enterprise and the OSPF configurations of R1.
Which of the following statements is false about the network?
- A. The network segment to which GE 0/0/1 of R1 belongs cannot be advertised.
- B. R2 can access the server.
- C. GE 0/0/1 of R1 cannot send OSPF packets.
- D. GE 0/0/1 of R1 cannot accept OSPF packets.
正解：A
解説：
The silent-interface command is used to prevent OSPF from sending or receiving OSPF packets on the specified interface (GE 0/0/1). This disables OSPF adjacency establishment and stops route advertisement for that interface.
質問 # 77
BGP itself does not discover routes. Therefore, other routes need to be imported to the BGP routing table for route exchanges between ASs. In import mode, routes are imported to the BGP routing table by protocol.
Which of the following routes can be imported to the BGP routing table using the import mode?
- A. IS-IS routes
- B. Static routes
- C. OSPF routes
- D. Direct routes
正解：A、B、C、D
質問 # 78
Which of the following strategies or tools cannot be applied to OSPF?
- A. as-path filter
- B. route-policy
- C. prefix-list
- D. access-list
正解：A
質問 # 79
The OSPF protocol has authentication capabilities for all data packets exchanged between neighboring routers.
In the VRP system, which of the following algorithms does OSPF support?
- A. MD5
- B. RSA
- C. AES
- D. DES
正解：A
質問 # 80
On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routing tables contain the routes to 192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?
- A. A filter-policy on R2 for filtering received routes
- B. A filter-policy on R1 for filtering the routes to be imported
- C. A filter-policy on R2 for filtering the routes to be advertised
- D. A filter-policy on R1 for filtering the imported routes to be advertised
正解：B
解説：
* Goal Analysis:
* Requirement:
* The route to 192.168.3.0/24 must exist in R1's and R3's routing tables.
* The route must not exist in R2's routing table.
* This requires filtering to ensure the route is either:
* Blocked on R2's routing table (via filtering on R2), or
* Blocked before it is advertised to R2.
* Analysis of Each Option:
* Option A (Filter-policy on R2 for filtering received routes):
* Applying a filter-policy on R2 to filter received routes will block the route from entering R2's routing table but still allow it to propagate to R3.
* This meets the requirement.
* Option B (Filter-policy on R2 for filtering the routes to be advertised):
* Blocking the advertisement of routes from R2 to other routers does not affect the routes received by R2 itself.
* This does not meet the requirement but does not affect the propagation to R3.
* This is valid if the received route is blocked.
* Option C (Filter-policy on R1 for filtering the routes to be imported):
* If the route is filtered on R1 during the import phase, the route will not exist in R1's routing table and thus cannot be advertised to either R2 or R3.
* This fails to meet the requirement because the route must exist in R1's and R3's routing tables.
* Option D (Filter-policy on R1 for filtering the imported routes to be advertised):
* Filtering routes on R1 before advertising to R2 will prevent R2 from receiving the route but allow R1 to advertise the route to R3.
* This meets the requirement.
* Correct Option:
* C (Filter-policy on R1 for filtering the routes to be imported): This will prevent the route from existing in both R1 and R3, violating the stated requirement.
References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Filtering
* Huawei OSPF Configuration and Filtering Methods
質問 # 81
On the campus OSPF network shown in the following figure, the interfaces connecting the five routers are GE interfaces, and their costs are not changed. The import-route command is run on R1. After the network converges, the route to the server at 192.168.1.0/24 is queried on R2. Which of the following is the cost of this route?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Understanding the Network Setup:
* The OSPF network consists of three areas (Area 1, Area 0, and Area 2).
* The server's subnet 192.168.1.0/24 is directly connected to R1 and imported into OSPF using the command:
import-route direct type 1 cost 2
* The type 1 specifies the route as an OSPF Type 1 external route, meaning both the external cost and the internal OSPF cost will be included when calculating the total cost.
* The external cost specified for the imported route is 2.
* Cost Calculation to R2:
* The interfaces between the routers are GE interfaces, and the default cost for GE interfaces is 1.
* The path from R2 to the server goes through the following hops:
* R2 # R1: Cost = 1 (intra-area link).
* R1 # Server: External cost = 2 (specified in the import-route command).
* Total cost to R2:
Intra-area cost (1) + External cost (2) = 3
* Verification of Each Option:
* Option A (2): Incorrect. This only accounts for the external cost, ignoring the internal OSPF cost.
* Option B (4): Incorrect. This overestimates the cost by adding an extra hop.
* Option C (3): Correct. The total cost is 3 (1 for the intra-area link + 2 for the external cost).
* Option D (1): Incorrect. This ignores the external cost of the imported route.
References:
* HCIA-Datacom Study Guide, Chapter: OSPF Route Types and Cost Calculation
* Huawei OSPF Cost Configuration Details
質問 # 82
When two BGP peers support different Hold Time, they will negotiate to support the shortest Hold Time interval they can support.
- A. FALSE
- B. TRUE
正解：B
解説：
When two BGP peers negotiate the Hold Time, the shorter value between the two configured Hold Time values is selected. This ensures compatibility and maintains the stability of the BGP session .
質問 # 83
What does the display current-configuration | include vlan command mean?
- A. View all configurations containing the "VLAN" keyword
- B. View the physical interface information bound to each VLAN
- C. Check which VLANs are currently created
- D. Check the IP address of the VLANIF interface
正解：A
質問 # 84
Which of the following description about BGP, OSPF, ISIS is correct?
- A. BGP runs based on UDP sessions, and the port number used is 179
- B. ISIS runs based on the IP protocol, using the protocol number 89
- C. The BGP neighbor relationship is established based on TCP sessions, and the port number used is 179
- D. OSPF runs based on the IP protocol, and the protocol number used is 90
正解：C
質問 # 85
When pinging the IP address of an interface of the firewall on the firewall, these packets will be handed over to the internal module of the firewall for processing and will not be forwarded.
- A. FALSE
- B. TRUE
正解：B
質問 # 86
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