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Question

Difficulty: HardNetwork Host Services and Server Roles

A network technician is troubleshooting connectivity issues affecting mobile handheld scanners in a newly opened fulfillment center. The scanners are unable to reach internal web applications by hostname, and running an IP configuration check on the devices reveals an IPv4 address of 169.254.44.12169.254.44.12 with a subnet mask of 255.255.0.0255.255.0.0. Which TWO network host services must the technician inspect to resolve the automatic addressing failure and enable local hostname resolution?

  1. DHCP serverAnswer
  2. DNS serverAnswer
  3. C
    Syslog server
  4. D
    Web proxy server

Answer

The technician must inspect the DHCP server and the DNS server.
The presence of an APIPA address (169.254.x.x169.254.x.x) signifies that client devices are unable to contact a DHCP server to obtain valid IP configuration details. Additionally, the inability of handheld scanners to resolve application hostnames directly points to a DNS server failure or misconfiguration, as DNS translates hostnames into underlying IP addresses.

Step-by-Step Solution

1
Analyze the IP configuration symptom
An IP address of 169.254.44.12 falls within the Automatic Private IP Addressing (APIPA) range, confirming that the client failed to receive an IP lease from a DHCP server.
When a client configured for dynamic addressing cannot communicate with a DHCP server, the operating system self-assigns an APIPA address.
2
Analyze the name resolution symptom
Inability to connect to internal services via hostname indicates that domain name resolution is missing or failing.
DNS servers are responsible for resolving human-readable hostnames to numeric IP addresses required for network communication.
3
Identify the required server roles
Verifying the DHCP server restored IP connectivity, while verifying the DNS server restored name resolution.
Both services must function correctly for client devices to receive network parameters and navigate to local servers by name.

Key Concept

Network Host Services (DHCP for dynamic IP assignment and DNS for hostname resolution)
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Topics

Network Host Services and Server Roles

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