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H12-821 Real Exam Questions

HCIP-Datacom-Core Technology V1.0

312 questions available · Page 1 of 32

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Question 1 Single choice

Which of the following statements regarding multicast MAC addresses are false?

  1. A

    One multicast MAC address maps to 32 multicast IP addresses.

  2. B

    One multicast MAC address maps to only one multicast IP address.

  3. C

    The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.

  4. D

    A multicast MAC address identifies receivers of a multicast group on the data link layer.

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Correct answer: B

Question 2 Multiple choice

The following figure shows a campus network . IS-IS is configured on all routers, and the network runs normally.

By default, which of the following routers have specific routes on the entire network?

  1. A

    R2

  2. B

    R3

  3. C

    R1

  4. D

    R7

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Correct answers: A, B

Question 3 Single choice

On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes.

Which of the following values is the default DIS priority of an IS-IS interface?

  1. A

    200

  2. B

    64

  3. C

    1

  4. D

    100

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Correct answer: B

Question 4 Single choice

Which of the following statements about stack split is false?

  1. A

    After a stack splits, the MAC addresses of the two stacks change immediately.

  2. B

    If the master and standby switches are still in the same stack after the stack splits, the slave switches separated from the original master and standby switches re-elect the master and standby switches due to protocol packet timeout.

  3. C

    If the master and standby switches are in two stacks after the split, the stack where the original master switch resides updates the topology and selects a new standby switch. The original standby switch becomes the master switch in the new stack and a new standby switch is elected.

  4. D

    After a stack splits, multiple stacks have the same IP address and MAC address. To prevent network faults, the stacks perform MAD detection. The stack that fails the MAD detection shuts down all
    physical ports except reserved ports.

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Correct answer: A

Question 5 Multiple choice

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?

  1. A

    Hello time values are different.

  2. B

    Area IDs are different.

  3. C

    Router IDs conflict.

  4. D

    The N-bit and E-bit of Hello packets are the same.

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Correct answers: C, D

Question 6 Single choice

A network entity title consists of an area address and a system ID. It is a special NSAP (the SEL has a fixed value of 00) and is mainly used for route calculation.

  1. A

    TRUE

  2. B

    FALSE

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Correct answer: A

Question 7 Single choice

Which of the following methods is usually used by a network administrator to configure a newly purchased device for the first time?

  1. A

    Telnet

  2. B

    SNMP

  3. C

    Login through the Console port

  4. D

    FTP

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Correct answer: C

Question 8 Fill in the blank

Use the default-route-advertise command in OSPF to advertise the default route to the common OSPF area. When there is no default route in the area, use ____ to force the advertisement. (Please fill in lowercase English)

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Accepted answer: ALWYS

Question 9 Single choice

Which of the following statements regarding the summary automatic command and BGP route summarization is false?

  1. A

    After this command is configured, BGP sends only the summarized routes to peers

  2. B

    This command is used to implement automatic summarization. Automatic summarization takes precedence over manual summarization

  3. C

    This command enables automatic summarization for the locally imported routes

  4. D

    After this command is configured, BGP summarizes routes based on natural network segments

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Correct answer: B

Question 10 Single choice

ICMPv6 messages are classified as error or informational messages.

  1. A

    TRUE

  2. B

    FALSE

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Correct answer: A