A network consists of several VLANs. A centralized DHCP server resides in VLAN 10, but hosts in VLANs 20 and 30 are not receiving IP addresses. Which command must you apply to the router interfaces that connect to VLANs 20 and 30 so the hosts can obtain their leases from the server in VLAN 10?
Configure 'ip helper-address ' on the router interfaces
Enable 'service ip-distribution' globally on the router
Configure 'ip address pool [pool name]' on the router interfaces
Configure 'ip relay-address ' on the router interfaces
On Cisco IOS routers, the ip helper-address interface command converts certain UDP broadcasts-including those sent by DHCP/BOOTP clients on ports 67 and 68-into unicast packets directed to the specified address. This mechanism lets routers act as DHCP relay agents, enabling clients on remote subnets or VLANs to reach a DHCP server.
The remaining commands are invalid or unrelated in IOS:
ip relay-address does not exist in standard IOS.
ip address pool by itself is not an IOS command; NAT address pools are created with ip nat pool, and DHCP pools with ip dhcp pool.
service ip-distribution is not a recognized IOS global command.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What does the 'ip helper-address' command do?
Open an interactive chat with Bash
Why can't clients in different VLANs directly communicate with a DHCP server?
Open an interactive chat with Bash
What happens if the 'ip helper-address' command is not configured?
Open an interactive chat with Bash
Cisco CCNA 200-301
IP Services
Your Score:
Report Issue
Bash, the Crucial Exams Chat Bot
AI Bot
Loading...
Loading...
Loading...
Pass with Confidence.
IT & Cybersecurity Package
You have hit the limits of our free tier, become a Premium Member today for unlimited access.
Military, Healthcare worker, Gov. employee or Teacher? See if you qualify for a Community Discount.
Monthly
$19.99
$19.99/mo
Billed monthly, Cancel any time.
3 Month Pass
$44.99
$14.99/mo
One time purchase of $44.99, Does not auto-renew.
MOST POPULAR
Annual Pass
$119.99
$9.99/mo
One time purchase of $119.99, Does not auto-renew.
BEST DEAL
Lifetime Pass
$189.99
One time purchase, Good for life.
What You Get
All IT & Cybersecurity Package plans include the following perks and exams .