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Difficulty: MediumTroubleshooting IP Addressing and DHCP Services

A network technician is migrating a branch office segment to a new IPv4 addressing scheme (10.50.40.0/2410.50.40.0/24). Workstations on VLAN 40 successfully acquire IP addresses from the central DHCP server, but users report they cannot reach servers on other subnets or access the internet. An output inspection of `ipconfig /all` on an affected client displays the following parameters:

- IPv4 Address: 10.50.40.8810.50.40.88
- Subnet Mask: 255.255.255.0255.255.255.0
- Default Gateway: 10.50.4.110.50.4.1
- DHCP Server: 10.20.10.510.20.10.5

Which TWO of the following configuration changes are required to restore full routing capabilities for these workstations?

  1. Update DHCP Scope Option 003 on the DHCP server to assign a gateway address residing on the 10.50.40.0/2410.50.40.0/24 subnet.Answer
  2. B
    Reconfigure the switchport connected to the host to use static APIPA addressing in the 169.254.0.0/16169.254.0.0/16 range.
  3. Ensure the router interface servicing VLAN 40 is configured with an IP address on the 10.50.40.0/2410.50.40.0/24 subnet.Answer
  4. D
    Change the IP helper address on the VLAN 40 router interface to point directly to 10.50.4.110.50.4.1.

Answer

To resolve the routing issue, the administrator must update DHCP Scope Option 003 on the DHCP server so clients receive a gateway address within 10.50.40.0/2410.50.40.0/24, and ensure the router interface on VLAN 40 is configured with a corresponding IP address in that same subnet.
For a host to communicate outside its local subnet, its default gateway must reside on the exact same IPv4 network segment. Updating DHCP Scope Option 003 ensures that clients receive a default gateway address within 10.50.40.0/2410.50.40.0/24, and verifying that the router interface servicing VLAN 40 has an IP address assigned in 10.50.40.0/2410.50.40.0/24 establishes the required physical Layer 3 forwarding point.

Step-by-Step Solution

1
Analyze client IP configuration settings from the `ipconfig /all` snippet.
Identified that the client IPv4 address (10.50.40.88/2410.50.40.88/24) and the configured default gateway (10.50.4.110.50.4.1) reside on different IP subnets.
A default gateway must reside on the same logical IP subnet as the client host to receive local Layer 2 frames destined for external routing.
2
Determine the necessary DHCP server scope modification.
Option 003 (Default Gateway) must be updated to an IP address within the client's local subnet range (10.50.40.0/2410.50.40.0/24).
Clients automatically pull their network configuration parameters via DHCP; modifying Option 003 ensures all scope lease recipients acquire a valid local gateway address.
3
Verify physical/logical router interface addressing on the local VLAN gateway.
The router interface attached to VLAN 40 must be assigned an IP address within 10.50.40.0/2410.50.40.0/24 matching the updated Option 003 value.
Without a corresponding active Layer 3 interface on the router inside the 10.50.40.0/2410.50.40.0/24 broadcast domain, packets destined outside the subnet cannot be processed.

Key Concept

Default Gateway Subnet Alignment and DHCP Option 003 Configuration
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Topics

Troubleshooting IP Addressing and DHCP Services

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