CCNP Infrastructure Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  ip dhcp pool POOL1, network 192.168.1.0 255.255.255.0, default-router 192.168.1.1, dns-server 8.8.8.8

  Why this is correct

  This configuration creates a DHCP pool named POOL1, defines the network and subnet mask, and provides the default gateway and DNS server. The ip dhcp pool command enters DHCP pool configuration mode, where network, default-router, and dns-server are valid commands. This fully satisfies the requirement to provide IP addresses, gateway, and DNS information to clients. It is the correct and standard way to configure a Cisco IOS DHCP server.

• ✗

  ip dhcp pool POOL1, network 192.168.1.0 255.255.255.0, default-router 192.168.1.1, dns-server 8.8.8.8, lease 0 8

  Why it's wrong here

  This configuration is almost correct but includes a lease time of 0 days 8 hours. While lease is a valid command, the lease duration is not a required element for basic DHCP operation; the default lease is 1 day. The question asks for required configuration, and lease is optional. However, the presence of lease does not make the configuration incorrect, but it is not required. The other options either miss DNS or are for static mappings. This option is not the best answer because it adds an unnecessary command, but it would still function. However, since the question asks for required configuration, this option includes an extra command that is not required, making it less precise than the option without lease.

• ✗

  ip dhcp excluded-address 192.168.1.1 192.168.1.10, then ip dhcp pool POOL1 with network 192.168.1.0 255.255.255.0 and default-router 192.168.1.1

  Why it's wrong here

  This configuration includes excluded addresses and a pool with network and default-router, but it omits the DNS server information. The requirement explicitly states that the router must provide DNS server information. Without the dns-server command in the pool, clients will not receive DNS settings. Therefore, this configuration is incomplete and does not meet the full requirement.

• ✗

  ip dhcp pool POOL1, host 192.168.1.100 255.255.255.0, hardware-address 0000.1111.2222

  Why it's wrong here

  This configuration creates a manual binding for a single host with a specific hardware address. It does not define a subnet pool for dynamic allocation, nor does it provide default gateway or DNS server options. The host command is used for static mappings, not for dynamic DHCP. This does not satisfy the requirement to serve an entire subnet with gateway and DNS information.