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Zorluk: OrtaIP Addressing and Network Configuration

A network technician manually configures network settings on a workstation attached to a corporate local subnet. The workstation is assigned an IP address of 10.0.15.50 with a subnet mask of 255.255.255.0 and a default gateway address of 10.0.16.1. The workstation can successfully ping neighboring hosts within the 10.0.15.0/24 network, but cannot reach any hosts on external subnets or the internet. Which of the following best explains the reason for this connectivity issue?

  1. The default gateway is configured on a different IP subnet than the host machine.Cevap
  2. B
    The workstation failed to contact a DHCP server and automatically assigned itself an APIPA address.
  3. C
    The DNS server is configured to lease IP addresses rather than performing hostname resolution.
  4. D
    An unmanaged Layer 2 switch is being used instead of a router to connect local hosts on the 10.0.15.0/24 subnet.

Cevap

The default gateway is configured on a different IP subnet than the host machine.
For a workstation to communicate with networks outside its local subnet, its configured default gateway must reside on the same IP subnet. With a /24 mask (255.255.255.0), the IP 10.0.15.50 is on the 10.0.15.0 network, while 10.0.16.1 is on the 10.0.16.0 network. Consequently, the workstation cannot send outbound traffic to the gateway router.

Adım Adım Çözüm

1
Analyze the IP address configuration and subnet mask.
The host IP address 10.0.15.50 with a subnet mask of 255.255.255.0 (/24) places the host on the 10.0.15.0/24 subnet, covering IP addresses 10.0.15.1 through 10.0.15.254.
Determining the local subnet range allows verification of host and gateway compatibility.
2
Compare the default gateway address to the host subnet range.
The configured default gateway address 10.0.16.1 belongs to the 10.0.16.0/24 subnet, which is outside the local 10.0.15.0/24 broadcast domain.
For a host to forward out-of-subnet traffic, the default gateway must be a reachable Layer 3 router address located on the host's own local subnet.
3
Identify the cause of remote connectivity failure.
The host can reach local neighbors on 10.0.15.0/24 via ARP and Layer 2 switching, but it cannot deliver frames to 10.0.16.1 because that IP address is on another network segment.
A misconfigured default gateway on an improper subnet breaks all routing outside the local network.

Anahtar Kavram

Subnet Masking and Default Gateway Placement
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Konular

IP Addressing and Network Configuration

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