300-410 Question #3: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Users report that IP addresses cannot be acquired from the DHCP server. The DHCP server is configured as shown. But about 300 total noncurrent users are using this DHCP server, but none of them are active for more than two hours per day. Which action fixes the issue within the current resources?

Options

• AConfigure the DHCP lease time to a bigger value
• BAdd the network 192.168.2.0 255.255.255.0 command to the DHCP pool
• CModify the subnet mask to the network 192.168.1.0 255.255.254.0 command in the DHCP pool
• DConfigure the DHCP lease time to a smaller value

Explanation

To resolve IP address exhaustion for noncurrent users who are inactive for most of the day, reducing the DHCP lease time allows addresses to be reclaimed more quickly. This action ensures available IP addresses for active users within existing network resources.

Common mistakes.

• A. Configuring a bigger DHCP lease time would exacerbate the problem by holding onto addresses for even longer, making them less available for new or returning clients.
• B. Adding a new network (192.168.2.0) would expand the address space, which is not addressing the issue 'within the current resources' and the problem of noncurrent users holding addresses.
• C. Modifying the subnet mask to 255.255.254.0 would expand the address pool, which is equivalent to adding more addresses and thus not a solution 'within the current resources' to address lease management.

Concept tested. DHCP lease management and address pool exhaustion

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-mt/dhcp-15-mt-book/dhcp-config-dhcp-server.html

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