A Unique Quiz On CCNA – DHCP Questions

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A Unique Quiz On CCNA  DHCP Questions - Quiz

As we move further into our studies with the CCNA program, it’s time to turn our attention to the Dynamic Host Configuration Protocol – a client/server protocol wherein an IP host is automatically provided with the IP address, subnet mask and default gateway and any other related configuration information.


Questions and Answers
  • 1. 

    When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two)

    • A.

      Network or subnetwork IP address

    • B.

      Broadcast address on the network

    • C.

      IP address leased to the LAN

    • D.

      IP address used by the interfaces

    • E.

      Manually assigned address to the clients

    • F.

      Designated IP address to the DHCP server

    Correct Answer(s)
    A. Network or subnetwork IP address
    B. Broadcast address on the network
    Explanation
    Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they can’t be assignable.

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  • 2. 

    Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two)

    • A.

      Set the IP gateway to be used by the network.

    • B.

      Perform host discovery used DHCPDISCOVER message.

    • C.

      Configure IP address parameters from DHCP server to a host.

    • D.

      Provide an easy management of layer 3 devices.

    • E.

      Monitor IP performance using the DHCP server.

    • F.

      Assign and renew IP address from the default pool.

    Correct Answer(s)
    C. Configure IP address parameters from DHCP server to a host.
    F. Assign and renew IP address from the default pool.
    Explanation
    The Dynamic Host Configuration Protocol (DHCP) performs two tasks: configuring IP address parameters from the DHCP server to a host and assigning and renewing IP addresses from the default pool. DHCP is responsible for automatically assigning IP addresses to devices on a network, ensuring that they have the necessary network configuration to communicate. It allows for centralized management of IP address allocation and simplifies the process of connecting devices to a network.

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  • 3. 

    Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?

    • A.

      The address is removed from the pool until the conflict is resolved.

    • B.

      The address remains in the pool until the conflict is resolved.

    • C.

      Only the IP detected by Gratuitous ARP is removed from the pool.

    • D.

      Only the IP detected by Ping is removed from the pool.

    • E.

      The IP will be shown, even after the conflict is resolved.

    Correct Answer
    A. The address is removed from the pool until the conflict is resolved.
    Explanation
    When there is an IP address conflict, the DHCP server removes the conflicting address from the pool until the conflict is resolved. This ensures that the conflicting address is not assigned to any other device and avoids further conflicts.

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  • 4. 

    How does a DHCP server dynamically assign IP address to host?

    • A.

      Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

    • B.

      Addresses are assigned for a fixed period of time. At the end of period, a new quest for an address must be made, and another address is then assigned.

    • C.

      Addresses are leased to host. A host will usually keep the same address by periodically contacting the DHCP sever to renew the lease.

    • D.

      Addresses are permanently assigned so that the host uses the same address at all times.

    Correct Answer
    C. Addresses are leased to host. A host will usually keep the same address by periodically contacting the DHCP sever to renew the lease.
    Explanation
    A DHCP server dynamically assigns IP addresses to hosts by leasing them. The host is assigned an IP address for a fixed period of time. To keep the same address, the host periodically contacts the DHCP server to renew the lease. This allows for efficient management of IP addresses and ensures that hosts can keep using the same address as long as they need it.

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  • 5. 

    Which statement is correct regarding the operation of DHCP?

    • A.

      A DHCP client uses a ping to detect address conflicts.

    • B.

      A DHCP server uses a gratuitous ARP to detect DHCP clients.

    • C.

      A DHCP client uses a gratuitous ARP to detect a DHCP server.

    • D.

      If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.

    • E.

      If an address conflict is detected, the address is removed from the pool for an amount of time configurable by the administrator.

    • F.

      If an address conflict is detected, the address is removed from the pool and will not be reused until the server is rebooted.

    Correct Answer
    D. If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
    Explanation
    An address conflict occurs when two hosts use the same IP address. During address assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the address is removed from the pool. The address will not be assigned until the administrator resolves the conflict.

    (Reference: http://www.cisco.com/en/US/docs/ios/12_1/iproute/configuration/guide/1cddhcp.html)

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