Examkin

Soru

Zorluk: OrtaIP Addressing and Network Configuration

A network technician is troubleshooting a newly deployed workstation that cannot resolve external domain names or access remote network segments. The technician executes `ipconfig /all` on the host and observes the following IP configuration details:

- IPv4 Address: 172.20.4.55172.20.4.55
- Subnet Mask: 255.255.255.0255.255.255.0
- Default Gateway: 172.20.5.1172.20.5.1
- DNS Server: 169.254.10.1169.254.10.1

Which of the following configuration errors are present on this workstation? (Select TWO.)

  1. The default gateway is configured on a different IP subnet than the host interface.Cevap
  2. The primary DNS server is assigned an Automatic Private IP Addressing (APIPA) address.Cevap
  3. C
    The workstation host IP address is an APIPA address generated due to a failed DHCP handshake.
  4. D
    The DNS server must match the default gateway IP address to perform dynamic IP address leasing.

Cevap

The workstation configuration contains two errors: the default gateway resides on a different IP subnet than the host interface, and the primary DNS server is configured with an unroutable APIPA address.
The correct options accurately identify both configuration issues. First, the default gateway (172.20.5.1172.20.5.1) is assigned to a different subnet than the host (172.20.4.55/24172.20.4.55/24), breaking local Layer 3 communication to off-subnet networks. Second, the DNS server is set to 169.254.10.1169.254.10.1, an APIPA address that cannot forward or fulfill DNS name resolution requests across subnets.

Adım Adım Çözüm

1
Analyze the host IP address and subnet mask to determine the local network boundaries.
The host IP 172.20.4.55172.20.4.55 with subnet mask 255.255.255.0255.255.255.0 (/24) belongs to network 172.20.4.0/24172.20.4.0/24, spanning usable host IPs from 172.20.4.1172.20.4.1 to 172.20.4.254172.20.4.254.
Understanding the host's subnet boundaries allows verification of default gateway reachability.
2
Compare the configured default gateway address against the local subnet segment.
The configured default gateway 172.20.5.1172.20.5.1 belongs to network 172.20.5.0/24172.20.5.0/24, which is outside the host's local subnet.
A host cannot send packets to a default gateway that does not reside on its local IP subnet segment.
3
Evaluate the configured DNS server IP address.
The DNS server IP 169.254.10.1169.254.10.1 lies within the APIPA range (169.254.0.0/16169.254.0.0/16), which is automatically self-assigned when DHCP fails and cannot route domain resolution requests.
Name resolution requires a valid, reachable DNS server IP address rather than an APIPA address.

Anahtar Kavram

IP Subnet Boundaries and Diagnostic Configuration Verification
Tahmini Süre:1m 30s
Bu soruyu puanla

Konular

IP Addressing and Network Configuration

Bu konudan daha fazla soru