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300-370 · Question #24

A wireless engineer has completed the configuration of a new WLAN on the existing Cisco wireless infrastructure. During testing he found that the wireless client's authenticate and received the…

The correct answer is D. Configure a dns-server on the switch DHCP pool. If wireless clients authenticate and receive IP addresses but cannot access resources, the most likely cause is a missing DNS server configuration in the DHCP pool.

Troubleshooting Client Connectivity Issues

Question

A wireless engineer has completed the configuration of a new WLAN on the existing Cisco wireless infrastructure. During testing he found that the wireless client's authenticate and received the correct ip address from the switch, but they were not able to access any of the internal or external resources. Which action will resolve the issue?

Options

  • AConfigure static ip addresses for the wireless clients.
  • BConfigure the default-router on the switch DHCP pool.
  • CConfigure option 82 on the switch DHCP pool.
  • DConfigure a dns-server on the switch DHCP pool.

How the community answered

(21 responses)
  • A
    5% (1)
  • B
    14% (3)
  • C
    5% (1)
  • D
    76% (16)

Why each option

If wireless clients authenticate and receive IP addresses but cannot access resources, the most likely cause is a missing DNS server configuration in the DHCP pool.

AConfigure static ip addresses for the wireless clients.

Configuring static IP addresses would not resolve the issue if the underlying problem is DNS or routing, as it only changes the IP assignment method.

BConfigure the default-router on the switch DHCP pool.

The question states clients received the 'correct ip address,' which usually implies they also received a functional default gateway, making a missing default-router less likely to be the sole issue for inability to access resources.

CConfigure option 82 on the switch DHCP pool.

DHCP Option 82 is used for relay agent information for security or policy, and does not directly impact a client's ability to access internal or external resources once it has an IP address.

DConfigure a dns-server on the switch DHCP pool.Correct

If wireless clients receive IP addresses but cannot access resources by name, it points to a lack of DNS resolution. Configuring a DNS server in the DHCP pool ensures clients receive the necessary DNS server IP address, allowing them to resolve hostnames to IP addresses and access internal or external resources.

Concept tested: DHCP configuration for client network access

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-mt/dhcp-15-mt-book/config-dhcp-server.html

Topics

#Client connectivity#DHCP troubleshooting#DNS resolution#Network access

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