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Difficulty: EasyDHCP Server, Client, and Relay Agent Operation and Configuration

A network administrator is configuring a Cisco IOS router to function as a DHCP server for a local subnet. To avoid IP address conflicts with statically configured devices such as default gateways and printers, the administrator must prevent the DHCP server from allocating addresses in the range 192.168.10.1 through 192.168.10.10. Which command should be executed in global configuration mode to accomplish this requirement?

  1. ip dhcp excluded-address 192.168.10.1 192.168.10.10Answer
  2. B
    ip helper-address 192.168.10.1
  3. C
    ip dhcp reserved-address 192.168.10.1 192.168.10.10
  4. D
    deny ip address 192.168.10.1 192.168.10.10

Answer

The command 'ip dhcp excluded-address 192.168.10.1 192.168.10.10' entered in global configuration mode correctly reserves the designated range of IP addresses so the local Cisco IOS DHCP server will not allocate them to dynamic clients.
Executing 'ip dhcp excluded-address 192.168.10.1 192.168.10.10' in global configuration mode instructs the Cisco IOS DHCP server to reserve all IP addresses from 192.168.10.1 through 192.168.10.10 inclusive, ensuring they are never offered to dynamic DHCP clients.

Step-by-Step Solution

1
Identify the configuration requirement for reserving static IP addresses on a Cisco IOS DHCP server.
Recognize that static IP addresses must be excluded before the DHCP server assigns them to pool clients to prevent duplicate IP address conflicts.
Cisco IOS DHCP servers issue any available address in a configured pool unless explicitly told not to assign specific addresses.
2
Select the appropriate Cisco IOS command mode and syntax.
Determine that global configuration mode command 'ip dhcp excluded-address <low-ip> <high-ip>' is used.
Exclusions are defined globally outside of the specific DHCP pool configuration mode context.

Key Concept

DHCP Address Exclusion Configuration
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Topics

DHCP Server, Client, and Relay Agent Operation and Configuration

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