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Zorluk: OrtaTroubleshooting IP Addressing and DHCP Services

A network administrator configures a new DHCP scope on a centralized server to service clients on VLAN 20 (subnet 10.20.10.0/2410.20.10.0/24). Users on VLAN 20 report that they can successfully communicate with other local hosts on VLAN 20, but cannot access external networks or corporate servers located on other subnets. Running `ipconfig /all` on an affected client displays an IPv4 address of 10.20.10.4510.20.10.45 with a subnet mask of 255.255.255.0255.255.255.0, but the Default Gateway field is empty. Which of the following is the most likely cause of this issue?

  1. DHCP Option 003 (Router) was not configured within the DHCP scope settings.Cevap
  2. B
    The router interface serving VLAN 20 is missing an IP helper address configuration.
  3. C
    The client host failed to contact the DHCP server and auto-generated an APIPA address.
  4. D
    The IP address 10.20.10.4510.20.10.45 is reserved as the broadcast address for the 10.20.10.0/2410.20.10.0/24 subnet.

Cevap

DHCP Option 003 (Router) was not configured within the DHCP scope settings.
DHCP clients require specific options to configure network settings beyond basic IP address assignment. DHCP Option 003 delivers the default gateway IP address to clients. When Option 003 is omitted from a scope configuration, clients receive valid IP addresses and subnet masks allowing local Layer 2 traffic, but lack the default gateway setting required to route packets to external subnets.

Adım Adım Çözüm

1
Analyze the IP configuration returned by the diagnostic command.
The client has acquired 10.20.10.45/2410.20.10.45/24, which is a valid lease from the configured 10.20.10.0/2410.20.10.0/24 pool.
Successful lease acquisition confirms physical layer 2 connectivity and functioning Layer 3 DHCP relay mechanisms.
2
Evaluate the symptom of intra-subnet versus inter-subnet communication.
Hosts can communicate within VLAN 20 but fail to reach external destinations.
Intra-subnet communication uses Layer 2 MAC addresses via ARP. Inter-subnet communication requires routing through a default gateway.
3
Correlate the missing Default Gateway field with DHCP server parameters.
DHCP Option 003 supplies the Default Gateway parameter to clients during the lease handshake.
Omitting Option 003 causes clients to successfully receive IP addresses and subnet masks while lacking the default route necessary to forward traffic outside the local network.

Anahtar Kavram

DHCP Option Configuration and Scope Parameters
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Troubleshooting IP Addressing and DHCP Services

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