最新的Huawei H12-821_V1.0免費考試真題

問題1

In BGP, the Origin attribute is used to identify the origin of a route. Which of the following statements are true about the Origin attribute?

A. If multiple routes carry the same destination address but different Origin attributes and all other route selection conditions are the same, BGP selects the optimal route according to the Origin attribute in the following order: IGP > EGP > Incomplete.

B. If a route is imported to BGP by the originator using the network command, the Origin attribute of the BGP route is displayed as i in the BGP routing table.

C. This attribute is a well-known mandatory attribute.

D. If a route is learned through EGP, the Origin attribute of this BGP route is displayed as ? in the BGP routing table.

正確答案: A,B,C

說明：（僅 Fast2test 成員可見）

問題2

Which of the following attribute must be carried in an Update message?

A. Prefval

B. Local-pref

C. AS-Path

D. MED

正確答案: C

說明：（僅 Fast2test 成員可見）

問題3

In the VRP, by default, the routes imported by BGP will be automatically summarized.

A. FALSE

B. TRUE

正確答案: A

說明：（僅 Fast2test 成員可見）

問題4

On an OSPF network, an algorithm is used to prevent loops within an area, but loops may occur between areas. Therefore, OSPF defines a loop prevention mechanism for inter-area routes. Which of the following statements are true about the loop prevention mechanism?

A. All non-backbone areas must be directly connected to area 0.

B. An ABR cannot inject Type 3 LSAs that describe routes to a network segment in an area back to the same area.

C. Inter-area routes cannot be directly transmitted between non-backbone areas.

D. Inter-area routes need to be forwarded through area 0.

正確答案: A,B,C,D

說明：（僅 Fast2test 成員可見）

問題5

Four routers run IS-IS and have established adjacencies. The area IDs and router levels are marked in the following figure. Which of the following statements is true?

A. The LSDB of R2 does not contain the LSP of R4.

B. The LSDB of R3 does not contain the LSP of R4.

C. The LSDB of R2 does not contain the LSP of R3.

D. The LSDB of R1 does not contain the LSP of R4.

正確答案: D

說明：（僅 Fast2test 成員可見）

問題6

Which of the following fields in DD packets is used for implicit acknowledgment to ensure the reliability and integrity of DD packet transmission on an OSPF network?

A. MS

B. M

C. I

D. sequence number

正確答案: D

問題7

The following figure shows the BGP state switching mechanism. Drag the following BGP states to the corresponding sequence numbers.

正確答案:

Explanation:
* 1 - Idle
* 2 - Connect
* 3 - OpenSent
* 4 - OpenConfirm
* 5 - Established
* 6 - Active
The BGP finite state machine defines how a BGP speaker transitions through various states when establishing and maintaining a BGP session. Below is the role of each state:
* Idle (1) - BGP is waiting to start a connection. Initial state of the BGP process.
* Connect (2) - BGP initiates a TCP connection to the peer.
* OpenSent (3) - TCP connection is established; BGP sends an OPEN message and waits for one from the peer.
* OpenConfirm (4) - BGP has received a valid OPEN message and is now expecting a KEEPALIVE.
* Established (5) - BGP session is fully established; UPDATE messages can now be exchanged.
* Active (6) - If the TCP connection fails in Connect state, BGP transitions to Active and will retry connection.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
"BGP goes through the following states in order: Idle # Connect # Active # OpenSent # OpenConfirm # Established. The transition depends on the success or failure of TCP connection setup and BGP message exchanges." (Chapter: BGP Principles - Section: BGP State Machine)

問題8

On an OSPF network, all OSPF routers generate Router LSAs. If the E bit in a Router LSA is set to 1 , the router that generates this LSA is a/an ______ .

A. ASBR

B. IR

C. ABR

D. DR

正確答案: A

說明：（僅 Fast2test 成員可見）

問題9

In IPsec , an SA (Security Association) is uniquely identified by three parameters . Which of the following parameters does not belong to the 3-tuple information?

A. Destination IP address

B. Security protocol ID

C. Key exchange protocol

D. SPI

正確答案: C

說明：（僅 Fast2test 成員可見）

問題10

A router forwards traffic based on a FIB table. Which of the following values of the Flag field in a routing entry indicates that the next hop of the route is the gateway?

A. D

B. G

C. H

D. S

正確答案: B

說明：（僅 Fast2test 成員可見）

問題11

When a router that runs BGP receives an unreachable route from a peer, which of the following measures will be taken by the router?

A. It discards the route.

B. It accepts the route and adds the route to the BGP routing table.

C. It accepts the route and adds the route to the IP routing table.

D. It replies with an error message to notify the peer that the route is unreachable.

正確答案: B

問題12

RSTP provides different functions in different scenarios. Which of the following statements Is false?

A. After TC-BPDU attack defense function is enabled, you can set the number of times the switch processes TC BPDUs within a certain period

B. The role of the designated port that is enabled with root protection cannot be changed

C. When the designated port enabled with root protection receives optimal RST BPDUs, the port enters the Discarding state and does not forward packets. If the port does not receive optimal RST BPDUs within a certain period of time, the port will automatically restore to the Forwarding state

D. If the edge port on the switch enabled with BPDU protection receives RST BPDU, the switch sets the edge port as a non-edge-port and triggers STP calculation

正確答案: B

說明：（僅 Fast2test 成員可見）

問題13

Without a prior version check, an engineer configures IGMP snooping on a device and the version of IGMP snooping is earlier than the IGMP versions on user hosts. In this case, which of the following situations will occur?

A. The IGMP snooping version of the device is automatically degraded, and users can receive multicast data properly.

B. Users cannot receive multicast data because the device forwards received IGMP Report messages only to router ports and does not generate group member ports or forwarding entries.

C. The IGMP versions of the hosts are automatically upgraded, and users can receive multicast data properly.

D. Users cannot receive multicast data, but the device generates forwarding entries after receiving IGMP Report messages.

正確答案: B

說明：（僅 Fast2test 成員可見）

問題14

iMaster NCE-Fabric networks. It helps customers improve service efficiency from multiple dimensions.
Which of the following functions is not supported by the controller?

A. Control

B. Management

C. Analysis

D. Forwarding

正確答案: D

最新的Huawei HCIP-Datacom-Core Technology V1.0 - H12-821_V1.0免費考試真題

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