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Question 570
On a LAN SVI 10.50.0.1/24, clients broadcast DHCPDISCOVER; the server is located across a routed hop. At which interface location must the DHCP helper be applied to capture those broadcasts?
- Apply ip helper-address to the server-facing uplink that receives only unicast responses, not client broadcasts
- Inspect show dhcp lease or interface IP address state without configuring any relay
- Apply the helper on the interface receiving client broadcasts
- Provide IP routing to the DHCP server without configuring a helper on the client-facing interface
Explanation
Correct Answer
C:Configure the DHCP relay helper on the incoming client-facing gateway SVI, where DHCPDISCOVER arrives; the helper then forwards the request toward the remote server using routed IP.
Incorrect Answers
A:The server-facing routed uplink does not receive the original client DHCPDISCOVER broadcast; an ip helper-address there will not relay that client-subnet request.
B:A read-only lease or interface display does not forward a client broadcast across the routed boundary.
D:Even with server routing in place, clients transmit link-local DHCP broadcasts that need a configured relay at the source segment if the DHCP server is off-subnet.
Question 571
VLAN 50 hosts send DHCPDISCOVER broadcasts to their default gateway, a Cisco IOS SVI `interface Vlan50` (10.50.0.1/24). Their DHCP server is in another routed subnet at 10.70.0.10, and routing/ACLs already permit the relay traffic. Which command belongs on interface Vlan50?
- ip helper-address 10.70.0.10
- ip address dhcp
- ip helper-address 10.50.0.255
- ip default-gateway 10.70.0.10
Explanation
Correct Answer
A:An ip helper-address on the inbound client VLAN gateway relays supported DHCP/BOOTP UDP broadcasts as unicast to the remote DHCP server address.
Incorrect Answers
B:The ip address dhcp interface command makes the SVI itself a DHCP client instead of relaying DHCPDISCOVER for attached hosts.
C:The 10.50.0.255 address is the local /24 broadcast, not the remote server 10.70.0.10 required in the stated routed configuration.
D:An ip default-gateway setting does not create a DHCP relay agent; it cannot forward the client broadcast to the DHCP server.
Question 572
A DHCP relay forwards a discover packet to a remote server, and the server must determine which client subnet should receive the offered lease. Which relay-agent gateway-address field communicates the client VLAN scope?
- Use the source UDP port as the client subnet selector
- Use only the offered DNS server option 6 as the scope identifier
- Use the client MAC address as a unique substitute for the relay subnet gateway
- Use DHCP relay giaddr gateway information
Explanation
Correct Answer
D:A relay gateway address enables the server to choose the appropriate subnet scope.
Incorrect Answers
A:The UDP service-port field identifies DHCP transport, not the original client-network context for pool selection.
B:DNS options convey resolver addresses; they are not the relay agent gateway address used by the server for scope selection.
C:The MAC can identify a client but does not by itself specify the VLAN subnet whose pool should be allocated.
Question 573
An IOS SVI for VLAN 50 must relay client broadcasts to one remote server at 10.70.0.10. Which interface-level helper command names that target IPv4 address?
- Configure ip helper-address 10.70.0.10 on the remote server, not the client VLAN interface
- Configure ip helper-address 10.70.0.10 on interface Vlan50
- Configure ip address dhcp on interface Vlan50 to make the router a client
- Configure ip helper-address 10.70.0.11 when the authorized server is 10.70.0.10
Explanation
Correct Answer
B:On the client-facing VLAN SVI, the IOS helper-address identifies the remote server to receive relayed DHCPv4 broadcasts; it uses the named 10.70.0.10 destination.
Incorrect Answers
A:The helper must be applied on the interface receiving the clients’ DHCP broadcasts, here SVI Vlan50.
C:DHCP client address acquisition is not the relay operation needed to forward VLAN 50 broadcasts to 10.70.0.10.
D:A different target would not forward client requests to the stated DHCP server.
Question 574
An `ip helper-address` is configured, but no offer reaches clients. The server is reachable only if ACLs allow UDP relay traffic through intervening routers. What independent network permissions/reachability should be checked?
- Change DHCP option 6 on clients before investigating blocked relay packets
- Check server-IP reachability and interposed ACLs
- Increase the DHCP lease time on the remote server to overcome packet filtering
- Change the client access VLAN without checking server reachability or UDP policy
Explanation
Correct Answer
B:Relaying cannot deliver client requests if the gateway cannot reach the server.
Incorrect Answers
A:DNS server list selection is unrelated to whether DHCP requests/offers can traverse the firewall.
C:Longer leases do not authorize UDP DHCP relay traffic through an interposed firewall.
D:The problem explicitly involves relay network paths and permitted DHCP traffic, not access VLAN misclassification.
Question 575
A DHCPv4 client and server are connected to the same VLAN, so no router relay is involved. In a capture of the initial client-to-server DHCP request, which UDP source/destination port pair is used?
- Source UDP 67, destination UDP 68
- Source UDP 53, destination UDP 53
- Source UDP 68, destination UDP 67
- Source TCP 68, destination TCP 67
Explanation
Correct Answer
C:The DHCPv4 client uses UDP source 68 and sends toward server UDP destination 67 in its initial request.
Incorrect Answers
A:UDP 67 is the DHCP server listening port, not the originating source port of an ordinary client request.
B:UDP 53 is used by DNS, not DHCPv4 address-assignment messages.
D:DHCPv4 uses UDP for the exchange; TCP ports 68/67 do not identify normal DHCP client traffic.
Question 576
A DHCP-configured router WAN interface still reports no IPv4 address after a cable change. Which client-state and upstream DHCP response evidence should be inspected before writing a static address?
- Read the interface’s configured DNS resolver list only
- Check DHCP relay giaddr on a LAN SVI instead of the WAN’s client state
- Rewrite the wan interface with an arbitrary static address before observing DHCP responses
- Check its ip address dhcp client state and upstream responses
Explanation
Correct Answer
D:The router interface must act as a client and hear a valid DHCP offer.
Incorrect Answers
A:DNS settings do not show whether the provider DHCP server sent an address lease to the WAN client.
B:A relay field describes forwarded LAN client requests; this router’s WAN interface is the DHCP client itself.
C:Premature static addressing masks the client-exchange fault and may collide with an assigned ISP subnet.
Question 577
A VLAN 20 client broadcasts DHCPDISCOVER but the configured server lives in a routed subnet. The router sees the broadcast on interface Vlan20. Which client-facing helper configuration should be checked first?
- Check the client-facing ip helper-address
- Place ip helper-address on the remote DHCP server-facing routed port only
- Configure ip address dhcp on the router SVI instead of relay
- Use DHCP option 6 to provide the remote server address as a relay target
Explanation
Correct Answer
A:DHCP client broadcasts require relay configuration when the server is off-subnet.
Incorrect Answers
B:The client broadcast arrives on interface Vlan20; the relay helper belongs on that client-facing gateway interface.
C:A DHCP client command requests an address for the router, not one on behalf of the VLAN 20 workstation.
D:Option 6 advertises DNS resolvers to clients, not where the router forwards DHCP requests.
Question 578
Remote DHCP clients all receive addresses from the wrong scope even though the helper forwards successfully. Which relay `giaddr` field and server-scope mapping should be compared?
- Reissue DHCPDISCOVER from a client without inspecting relayed subnet identity
- Review relayed giaddr and corresponding DHCP scopes
- Verify only that UDP port 67 packets pass the firewall
- Change the SVI native VLAN setting to 1 at random
Explanation
Correct Answer
B:The gateway address identifies the originating client subnet to the server.
Incorrect Answers
A:A fresh discover may reproduce the wrong lease if the server’s scope mapping for giaddr is still incorrect.
C:Packet delivery is already successful; the issue is the wrong client subnet/scope association in relay information.
D:Native VLAN tagging is unrelated to mapping the DHCP relay’s client gateway field to the correct server address pool.
Question 579
A relay sends DHCP requests toward 10.70.0.10 but a firewall between the VLAN gateway and server may block packets. Which IP route and UDP relay ACL permissions must be confirmed?
- Review IP routes and UDP relay ACL policy
- Change the DHCP scope lease duration on the server before inspecting the firewall
- Configure a new static default route without checking existing remote-server reachability
- Inspect only DHCP option 3 in successful client leases
Explanation
Correct Answer
A:The relay needs a routable, permitted path to the DHCP server.
Incorrect Answers
B:Lease lifetime does not unblock or route requests and replies between relay and server.
C:Adding an unverified route can create a black hole; first verify the actual routing and UDP policy paths.
D:Gateway option values do not establish that the firewall permits relayed DHCP packets on the network path.
Question 580
A DHCP client receives a working IP and gateway but cannot resolve DNS names. The server's lease packet may have an incorrect DNS-server list. Which DHCP option carries the DNS server IPv4 addresses?
- Inspect DHCP option 3, the default gateway
- Inspect DHCP option 6 in the delivered client parameters
- Inspect DHCP option 51, the lease time
- Inspect DHCP option 1, the IPv4 subnet mask
Explanation
Correct Answer
B:DHCP can distribute DNS resolver addresses as part of the lease.
Incorrect Answers
A:Option 3 supplies routers/default gateways, not the DNS server list required for hostname resolution.
C:Option 51 tells the client how long it may retain the address but does not identify recursive resolvers.
D:Option 1 identifies the local mask and does not include the DNS resolver addresses.
Cisco Certified Network Associate (CCNA) (200-301) Practice Tests