H12-821_V1.0無料試験問題と解答PDF最新問題2025年03月
最新H12-821_V1.0試験問題集で最近更新された176問題
質問 # 31
Which of the following statements about the forwarding plane of a switch is false?
- A. Consists of main control boards and interface boards.
- B. Can encapsulate and decapsulate packets.
- C. Can collect packet statistics.
- D. Provides high-speed and non-blocking data channels.
正解：C
質問 # 32
When configuring an ACL on a router, you can specify a unique number or name to identify the ACL. Once a named ACL is created, it cannot be modified. You can only delete the named ACL and reconfigure it.
- A. FALSE
- B. TRUE
正解：A
解説：
ACL Modification
* Named ACLs can be modified after their creation. Unlike numbered ACLs, named ACLs provide greater flexibility for editing individual rules without deleting the entire ACL.
* Therefore, the statement is incorrect.
HCIP-Datacom-Core Reference
* The flexibility and editability of named ACLs are discussed in the ACL configuration sections.
質問 # 33
Compared with STP, RSTP defines the different port states. Which of the following statements regarding discarding and learning states are true?
- A. The port In discarding or learning state does not forward data frames.
- B. The port In learning stole docs not learn MAC addresses table.
- C. The port in discarding or learning state does not learn MAC addresses
- D. The port in discarding state does not learn MAC addresses table.
正解：C
質問 # 34
Which of the following statements regarding OSPF route summarization commands are true?
- 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 not-advertise parameter takes effect by default.
- B. Advertise is the default parameter of the abr-summary command. That is, if not-advertise is not specified in the abr-summary command, the advertise parameter takes effect by default.
- C. The asbr-summary command is executed in the OSPF view.
- D. The abr-summary command is executed in the OSPF area view.
正解：B、C、D
解説：
The asbr-summary command is executed in the global OSPF view to summarize external routes. The abr- summary command is executed in the OSPF area view to summarize routes between areas. By default, the advertise parameter is enabled unless explicitly overridden by the not-advertise option .
質問 # 35
Drag the following VRRP states to the corresponding working mechanisms.
正解：
解説：
Explanation:
Master
Backup
Master
Backup
質問 # 36
Which of the following statements regarding an IP prefix are true?
- A. An IP prefix filter is used to filter IP address prefixes and cannot match an IP prefix number and a prefix length at the same time.
- B. An IP prefix filter is used to filter IP address prefixes and can match an IP prefix number and a prefix length at the same time.
- C. An IP prefix filter can be used to filter data packets.
- D. An IP prefix filter cannot be used to filter data packets.
正解：C
質問 # 37
On an OSPF network, if a router receives an update of an LSA that exists in the local LSDB, the router updates the LSDB and floods the LSA.
- A. FALSE
- B. TRUE
正解：A
解説：
OSPF LSA Flooding Mechanism
* If a router receives an LSA identical to one already in its LSDB, it does not flood the LSA again unless the LSA has changed (i.e., the sequence number or content has been updated).
* OSPF ensures efficient use of bandwidth by avoiding redundant flooding of unchanged LSAs.
HCIP-Datacom-Core Reference
* The OSPF LSDB synchronization process explains that unchanged LSAs are not reflooded, ensuring stability and resource optimization.
質問 # 38
BGP is generally applied to complex networks where routes change frequently. Frequent route flapping consumes a large number of bandwidth and CPU resources, and even affects the normal operation of the network. This is an unavoidable problem that cannot be solved in BGP.
- A. FALSE
- B. TRUE
正解：A
解説：
BGP Route Flapping and Mitigation
* While route flapping is a concern in large-scale networks, BGP employs mechanisms such as Route Dampening to mitigate its impact. Route dampening suppresses frequently flapping routes for a period of time to reduce resource consumption and network instability.
* Therefore, it is incorrect to state that the issue cannot be resolved in BGP.
HCIP-Datacom-Core Reference
* The mechanism of route dampening is detailed in the BGP optimization chapters.
質問 # 39
Which of the following statements is false, based on the following IGMP information on an interface of RTA?
XC
- A. The IGMP version is IGMPV2.
- B. The interval for sending group-specific Query messages is 60s.
- C. The IP address of the interface is 192.168.1.1.
- D. The maximum time for response to Query messages is 10s.
正解：B
解説：
The information provided indicates that the configured query interval is 60 seconds, which applies to general queries. Group-specific queries are sent at a shorter interval, usually derived from the maximum response time. Therefore, the statement about a 60-second interval for group-specific queries is false. Other statements regarding maximum response time (10s), IP address, and IGMP version (V2) are correct .
質問 # 40
Compress the 2001:0DBB:B8:0000:C030:0000:0000:09A0:CDEF address.___________(if the answer contains letters, capitalize them.)
正解：
解説：
2001:DBB:B8:0:C030::9A0:CDEF
Explanation:
The IPv6 address 2001:0DBB:B8:0000:C030:0000:0000:09A0:CDEF can be compressed by removing leading zeros in each segment and collapsing consecutive zero groups into ::. The result is 2001:DBB:B8:0:
C030::9A0:CDEF .
質問 # 41
Which of the following LSAs are advertised only within a single area?
- A. Router LSA
- B. AS External LSA
- C. Summary LSA
- D. Network LSA
正解：A、D
解説：
Router LSAs (Type 1) and Network LSAs (Type 2) are advertised only within a single OSPF area, as they describe the topology within the area. In contrast, Summary LSAs (Type 3) and AS External LSAs (Type 5) are used for inter-area and external routing, respectively .
質問 # 42
See the following figure. RTA, RTB, RTC, and RTD are in the same AS and establish IBGP peer relationships through direct links. RTB an RTC are route reflectors (RRs), RTA and RTC are the RR clients of RTB, and RTB and RTD are the RR clients of RTC. If RTA advertises the route 10.1.1.0/24 to the BGP process, the Originator ID of the BGP route received by RTD is------------------.
正解：
解説：
IN ORDER
質問 # 43
OSPF has five types of packets, which have the same header format. If the Auth Type field in the packet header is 1, which of the following authentication modes is used?
- A. Non-authentication
- B. Plaintext authentication
- C. MD5 authentication
- D. Hash authentication
正解：B
解説：
OSPF Authentication Overview
* The Auth Type field in the OSPF packet header determines the authentication mode. If the Auth Type is
1, plaintext authentication is used.
* Plaintext authentication involves transmitting the password in an easily readable format, which is less secure compared to MD5.
HCIP-Datacom-Core Reference
* Authentication mechanisms, including plaintext authentication, are detailed in the OSPF security configuration chapter, confirming that Auth Type = 1 corresponds to plaintext.
質問 # 44
To prevent inter-area routing loops, OSPF does not allow advertising routing information between two non- backbone areas and allows sing routing information only within an area or between the backbone area and a non-backbone area. Therefore, each ABR must be connected to the backbone area.
- A. TRUE
- B. FALSE
正解：A
解説：
OSPF (Open Shortest Path First) mandates that the backbone area (Area 0) serves as the central area for routing information exchange. To avoid inter-area routing loops, routing information is only exchanged between the backbone area and non-backbone areas, not directly between two non-backbone areas.
Consequently, each Area Border Router (ABR) must connect to the backbone area to facilitate this routing exchange .
質問 # 45
An edge port is a new port role added to RSTP to overcome the disadvantages of STP. Which of the following statements is false about this port role?
- A. After receiving a configuration BPDU, the port is still in the Forwarding state.
- B. The port can directly enter the Forwarding state from the Discarding state.
- C. The Up and Down states of the port do not cause network topology changes.
- D. The port does not participate in RSTP calculation.
正解：A
解説：
Edge Port Behavior
* An edge port transitions directly to the Forwarding state but reverts to participating in RSTP calculations if it receives a valid configuration BPDU. Thus, statement C is false.
HCIP-Datacom-Core Reference
* The behavior of edge ports and their transitions are discussed in the RSTP enhancement sections.
質問 # 46
When a routing policy is used to filter routes, which of the following route prefixes will be denied by the IP prefix below?
- A. 1.1.1.2/16
- B. 1.1.1.1/32
- C. 1.1.1.1/24
- D. 1.1.1.1/26
正解：A、C
解説：
The prefix list permits the prefix 1.1.1.1/24 with a mask length greater than or equal to /26 and less than or equal to /32. This means only prefixes with the base 1.1.1.1 and mask lengths between /26 and /32 will be permitted. Routes like 1.1.1.2/16 and 1.1.1.1/24 do not meet the mask length criteria, so they will be denied.
Conversely, routes like 1.1.1.1/26 and 1.1.1.1/32 satisfy the condition and will be permitted .
質問 # 47
There are two BFD operating modes. In_______mode, the local end sends BFD Control packets at specified intervals, and the remote end checks whether the local end periodically sends BFD Control packets. (Use lowercase letters.)
正解：
解説：
asynchronous Explanation:
In asynchronous mode, the local device sends BFD control packets at predefined intervals, and the remote device monitors the receipt of these packets to detect connectivity issues. This is one of the two operating modes in BFD, the other being demand mode .
質問 # 48
Which of the following scenarios is not suitable for deploying interface PBR?
- A. On an enterprise network with multiple ISP outbound interfaces, each internal network segment accesses the Internet through a particular ISP outbound interface.
- B. A core switch needs to forward the traffic between the intranet and extranet to a security detection device that connects to the core switch in off-path mode.
- C. A device needs to modify the next-hop IP address for locally originated traffic.
- D. A core switch needs to forward traffic between the intranet and extranet to an AC device that connects to the core switch in off-path mode.
正解：C
解説：
Policy-Based Routing (PBR) on interfaces is used to forward traffic based on specific policies rather than the routing table. However, PBR is not suitable for modifying the next-hop of locally originated traffic. Other scenarios listed are typical use cases for interface PBR .
質問 # 49
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