Examkin

Soru

Zorluk: Çok zorIP Addressing and Network Configuration

A network technician is troubleshooting a newly deployed workstation configured with static IP parameters. The workstation can successfully communicate with local host devices on its immediate segment, but it cannot access resources on remote subnets or reach the corporate gateway. Running `ipconfig /all` on the workstation reveals the following settings:

- IPv4 Address: 10.1.50.11210.1.50.112
- Subnet Mask: 255.255.255.192255.255.255.192
- Default Gateway: 10.1.50.19010.1.50.190
- DNS Server: 10.1.50.210.1.50.2

Upon checking the network documentation, the technician notes that the router's local interface for this subnet is assigned the IP address 10.1.50.126/2610.1.50.126/26. Which of the following best explains why the workstation cannot access remote subnets?

  1. The configured default gateway address belongs to a different logical IP subnet than the workstation's assigned subnet.Cevap
  2. B
    The workstation failed to contact a DHCP server and automatically self-assigned an APIPA address in the 10.1.50.0 range.
  3. C
    The DNS server address is invalid because DNS resolution hosts cannot exist on the same IP subnet as host workstations.
  4. D
    An unmanaged Layer 2 switch was installed instead of a router to interconnect the workstation directly to the DNS server.

Cevap

The workstation's configured default gateway address resides on a different logical IP subnet than the host's assigned IP address space.
The subnet mask 255.255.255.192255.255.255.192 (/26) creates subnets with 6464 IP addresses each. For the workstation IP 10.1.50.11210.1.50.112, the local subnet range is 10.1.50.6410.1.50.64 through 10.1.50.12710.1.50.127, with usable host addresses from 10.1.50.6510.1.50.65 to 10.1.50.12610.1.50.126. The configured default gateway IP of 10.1.50.19010.1.50.190 belongs to the next block (10.1.50.128/2610.1.50.128/26). Because the default gateway must reside on the same local subnet as the host to be directly reachable at Layer 2, the workstation cannot send outbound traffic to remote networks.

Adım Adım Çözüm

1
Analyze the subnet mask to determine subnet boundaries
A subnet mask of 255.255.255.192255.255.255.192 corresponds to a prefix length of /26/26, yielding block sizes of 6464 IPs per subnet (256−192=64256 - 192 = 64).
Calculating subnet block sizes is required to identify subnet range boundaries.
2
Determine the host's active subnet range
For host IP 10.1.50.11210.1.50.112, the network boundary is 10.1.50.64/2610.1.50.64/26. The network address is 10.1.50.6410.1.50.64, usable host range is 10.1.50.6510.1.50.65 to 10.1.50.12610.1.50.126, and broadcast address is 10.1.50.12710.1.50.127.
This establishes which IP addresses are considered local by the workstation.
3
Evaluate the configured default gateway against the host's subnet boundary
The configured gateway 10.1.50.19010.1.50.190 lies within the adjacent subnet range (10.1.50.128/2610.1.50.128/26), which spans from 10.1.50.12810.1.50.128 to 10.1.50.19110.1.50.191.
A host cannot send packets directly to a default gateway that does not belong to its own local IP subnet, preventing off-subnet routing.

Anahtar Kavram

IP Subnetting and Default Gateway Placement
Bu soruyu puanla

Konular

IP Addressing and Network Configuration

Bu konudan daha fazla soru