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Scenario-based practice

DHCP Troubleshooting Scenarios

Practise 300-410 DHCP questions covering DORA flow, scopes, excluded addresses, default gateway options, helper addresses, and troubleshooting clients that receive APIPA or cannot get an IP address.

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15
scenario questions
300-410
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Cisco
vendor

Scenario guide

How to approach dhcp troubleshooting scenarios

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.

Quick answer

DHCP questions usually test address assignment, scopes, relay agents, excluded addresses and why a client cannot obtain an IP address.

DHCP discovery, offer, request and acknowledgement flow.

DHCP scopes, excluded addresses and default gateway options.

DHCP relay using helper addresses.

Troubleshooting clients that receive APIPA or no address.

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Practice set

Practice scenarios

Question 1mediummultiple choice
Read the full DHCP explanation →

Consider the following DHCPv6 configuration on router R2:

ipv6 dhcp pool DHCP6_POOL dns-server 2001:db8::1 domain-name example.com !

interface GigabitEthernet0/0

ipv6 address 2001:db8:1::1/64 ipv6 dhcp server DHCP6_POOL ipv6 nd other-config-flag

no shutdown

What is the effect of this configuration?

Question 2easymultiple choice
Read the full DHCP explanation →

Which DHCP message type is used by a client to renew its lease before it expires?

Question 3mediumdrag order
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Drag and drop the steps to verify and validate DHCP (IPv4 and IPv6) operational state into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
Question 4hardmultiple choice
Read the full DHCP explanation →

An engineer configures a DHCP server on a Cisco router to assign IP addresses from a pool. Clients receive addresses, but when the engineer checks 'show ip dhcp binding', no bindings are displayed. Which is the most likely explanation?

Question 5easymultiple choice
Read the full DHCP explanation →

What is the default lease duration for a DHCPv4 address pool on a Cisco IOS router?

Question 6mediummultiple choice
Read the full DHCP explanation →

A network engineer runs the following command on Router R1:

R1# show ipv6 dhcp binding

Client: FE80::1 DUID: 0003000100AABBCCDDEE

Username: unknown

IA NA: IA ID 0x00010001, T1 302400, T2 483840 Address: 2001:DB8:1::100/128 Preferred lifetime 604800, valid lifetime 2592000 Expires at Sep 15 2024 12:00 PM (2592000 seconds)

Based on this output, which statement is correct?

Question 7mediummultiple choice
Read the full DHCP explanation →

A network engineer runs the following command on Router R1:

R1# show ip dhcp pool POOL1

Pool POOL1 : Utilization mark (high/low) : 100 / 0 Subnet size (first/next) : 0 / 0 Total addresses : 10 Leased addresses : 10 Pending event : none 1 subnet is currently in the pool : Current index IP address range Leased addresses

192.168.1.11         192.168.1.10    - 192.168.1.19       10

Based on this output, which statement is correct?

Question 8easymultiple choice
Read the full DHCP explanation →

A network engineer runs the following command to verify DHCPv4 server bindings on router R1:

R1# show ip dhcp binding

Output: Bindings from all pools not associated with VRF:

IP address       Client-ID/              Lease expiration        Type

Hardware address/ User name

192.168.1.10     0050.7966.6800           Mar 01 2025 12:00 PM   Automatic
 192.168.1.11     0063.6973.636f.2d30      Mar 01 2025 01:00 PM   Automatic
 192.168.1.12     0100.1a.2b.3c.4d.5e     Mar 01 2025 02:00 PM   Automatic

What does this output indicate?

Question 9mediummultiple choice
Read the full DHCP explanation →

A network engineer runs the following command to verify DHCPv6 guard policy:

R1# show ipv6 dhcp guard policy DHCP-POLICY

Policy: DHCP-POLICY Status: Active Device role: dhcp-client Trusted ports: none Untrusted ports: Fa0/0 DHCPv6 guard: enabled DHCPv6 guard action: block DHCPv6 server validation: enabled DHCPv6 server list: 2001:db8::10

What does this output indicate?

Question 10hardmultiple choice
Read the full DHCP explanation →

An engineer configures DHCPv6 prefix delegation on a router with multiple requesting interfaces. The router receives a /48 prefix from the server, but only one interface gets a /64 sub-prefix. Which is the most likely explanation?

Question 11hardmultiple choice
Read the full DHCP explanation →

What is the default DHCPv6 client DUID type on a Cisco IOS-XE router?

Question 12mediummultiple choice
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What is the default DHCPv4 renewal time (T1) as a percentage of the lease time?

Question 13mediummultiple choice
Read the full DHCP explanation →

A network engineer runs the following command on Router R1:

R1# show ip dhcp binding

Bindings from all pools not associated with VRF:

IP address       Client-ID/              Lease expiration        Type

Hardware address/ User name

192.168.1.10     0063.6973.636f.2e30.    Mar 01 2020 12:00 AM    Automatic
                 3030.3030.2e30.3030
                 312e.3130.3030.2e30
                 3030.312d.4574.682d

302f.31

192.168.1.11     0063.6973.636f.2e30.    Mar 01 2020 12:00 AM    Automatic
                 3030.3030.2e30.3030
                 312e.3130.3030.2e30
                 3030.312d.4574.682d

302f.31

Based on this output, which statement is correct?

Question 14easymultiple choice
Read the full DHCP explanation →

Which DHCPv4 message type does a client send to request a specific IP address previously offered?

Question 15hardmultiple choice
Read the full DHCP explanation →

What is the default DHCPv4 client lease time on a Cisco IOS-XE router configured as a DHCP client?

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