DHCP questions cover server configuration, relay agents (ip helper-address), DHCP snooping, and the four-step DORA handshake. Common exam scenarios: a host isn't getting an IP, a relay agent isn't forwarding requests, or a rogue DHCP server is handing out wrong addresses.
Start Scenario PracticeDrag and drop the steps of DHCP snooping operation on a Cisco switch into the correct order, from first to last.
Explanation: DHCP snooping begins by enabling the feature globally with 'ip dhcp snooping'. Then, the feature is enabled on specific VLANs. Trusted interfaces (typically uplinks to DHCP servers) are configured with 'ip dhcp snooping trust'. The switch then intercepts DHCP messages, building the DHCP snooping binding database from valid server responses. Finally, any DHCP server messages received on untrusted interfaces are dropped to prevent rogue server attacks.
Drag and drop the steps of DHCP snooping and dynamic ARP inspection flow into the correct order, from first to last.
Explanation: DHCP snooping builds a binding table used by DAI. The switch validates DHCP messages, creates bindings, then intercepts ARP packets and compares them against the binding table to prevent spoofing.
Drag and drop the steps of the DHCP DORA process into the correct order, from first to last.
Explanation: The DHCP DORA process begins with the client broadcasting a Discover message to locate a DHCP server. The server responds with an Offer message containing an IP address and configuration parameters. The client then sends a Request message to formally request the offered IP address. Finally, the server sends an Acknowledge message to confirm the lease and provide the configuration.
Drag and drop the steps of stateless DHCPv6 address assignment steps into the correct order, from first to last.
Explanation: Stateless DHCPv6 uses SLAAC for addressing and DHCPv6 for additional parameters. The host sends an RS, receives an RA with the O flag, then sends an Information-Request and receives a Reply with options like DNS.
Drag and drop the steps of DHCP failover configuration between primary and standby into the correct order, from first to last.
Explanation: DHCP failover uses a primary-standby relationship. Configure the primary server first with a failover peer, then the standby with the same peer name and IP, and finally enable the pool on both. The servers negotiate roles and start lease synchronization.
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Practice all DHCP Troubleshooting ScenariosDHCP questions cover server configuration, relay agents (ip helper-address), DHCP snooping, and the four-step DORA handshake. Common exam scenarios: a host isn't getting an IP, a relay agent isn't forwarding requests, or a rogue DHCP server is handing out wrong addresses. These appear throughout the 350-401 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-401. Practicing each scenario type ensures you're ready for any format.
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