Tüm alıştırma soruları

A network administrator installs a multimode fiber optic patch cable between two rack-mounted switches in a data center. Although physical link connectivity is established, the switch management interface logs a high rate of bit errors and optical power loss. An OTDR scan reveals a sudden, localized non-reflective loss at a point where the cable is tightly zip-tied around a sharp corner of the cable tray, with no glass break detected. Which of the following physical layer issues is the most likely cause of this signal degradation?

A network administrator is diagnosing several switching, trunking, and physical layer issues across access and core switches in an enterprise environment. Match each switch console symptom or log output on the left with its corresponding underlying root cause on the right.

A network technician is responding to a user ticket reporting a duplicate IP address error notification on VLAN 12 ($10.12.0.0/24$). Place the following diagnostic and remediation steps in the correct chronological order from initial investigation to final resolution.

An enterprise network operations team is establishing key performance indicators (KPIs) for a mission-critical payment gateway system. The Business Impact Analysis (BIA) specifies that data loss during a unexpected outage must not exceed 30 minutes of transaction history, and full operational capability of the network infrastructure must be restored within 2 hours of a disruption. Which TWO of the following configuration goals or metrics directly align with these specified business requirements? (Select TWO.)

A network administrator is troubleshooting connectivity to an internal updates repository on a Windows workstation. The workstation is failing to resolve the host name update.service.internal. To resolve the issue, the administrator wants to purge any cached domain name resolution records locally on the workstation and directly test hostname resolution using a specific internal DNS server located at 192.168.10.50. Which of the following commands should the administrator execute to accomplish these tasks? (Select TWO)

A network engineer is evaluating wireless site survey methodologies for an upcoming enterprise WLAN deployment across a multi-story facility. Match each wireless site survey type on the left with its primary operational requirement or objective on the right.

A system administrator suspects a Windows workstation has been compromised and is sending outbound traffic to an unknown command-and-control server. The administrator opens Command Prompt to determine which local Process ID (PID) is responsible for establishing active outbound socket connections. Which command-line utility switch combination should the administrator execute to view numerical IP addresses, active connection states, and their corresponding process IDs?

Users in a regional branch office report that their workstations can successfully communicate with local peers on their LAN segment but are unable to access centralized enterprise resources hosted at $10.50.0.0/24$. A network technician executes `ipconfig /all` on a affected workstation and receives the following output:

text
IPv4 Address. . . . . . . . . . . : 192.168.45.112
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.4.1
DHCP Server . . . . . . . . . . . : 192.168.45.1

Which of the following represents the root cause of the routing failure to external subnets?

A network administrator notices severe throughput degradation and high frame retransmission rates across a newly deployed $2.4\text{ GHz}$ wireless network serving four adjacent open-office zones. Reviewing the wireless controller configuration reveals that neighboring access points are currently statically assigned to channels 1, 4, 7, and 10. Which configuration change must the administrator implement to eliminate adjacent channel interference (ACI) between the neighboring access points?

During a planned network maintenance window, an administrator installs a new central switch (Switch-Core) to serve as the core switching node. After connecting Switch-Core to the access switches, network traffic follows sub-optimal paths across the campus topology. Troubleshooting reveals that an old edge switch (Switch-Access-3) with a configured Spanning Tree Protocol (STP) bridge priority of 4096 has been elected as the STP root bridge because Switch-Core is using the default STP priority of 32768. Which configuration change on Switch-Core will resolve this issue and establish Switch-Core as the STP root bridge?

A network administrator is troubleshooting an issue where newly deployed host systems on a corporate subnet ($10.100.40.0/24$) can communicate with local peers but fail to reach external subnets or internet services. Executing `ipconfig /all` on one of the affected hosts produces the following output:

text
IPv4 Address. . . . . . . . . . . : 10.100.40.88
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.100.4.1
DHCP Server . . . . . . . . . . . : 10.100.1.10

Which of the following options accurately identify the root cause of this connectivity failure and the appropriate corrective action? (Select TWO.)

A network administrator is systematically troubleshooting an end user's workstation that cannot access an internal web application located at `https://app.corp.local`. Place the command-line utility operations in the logical sequential order recommended for isolation, starting from basic local network interface validation up to upper-layer protocol testing.

Match each physical layer cabling symptom or test result on the left with its most likely root cause on the right.

A network technician is troubleshooting an issue on a Linux host that cannot resolve the hostname of an internal server `app.corp.local`. The technician runs `dig app.corp.local` and receives a response indicating `STATUS: SERVFAIL` from the local recursive DNS server at `192.168.1.2`. To determine whether the issue is isolated to the local recursive server or affects the authoritative server directly, the technician wants to query the domain's designated authoritative DNS server at `10.0.5.50`. Which of the following command-line entries should the technician execute?

An enterprise network storage server experiences severe database corruption on a Thursday morning. To recover system functionality with zero data loss, the network team must execute a restoration plan. The organization's backup policy includes a weekly full backup performed every Sunday at 00:00, daily differential backups taken at 23:00, and continuous transaction logging. In what correct chronological order should the administrator execute the restoration steps?

A network administrator is troubleshooting inter-switch communication between Switch-Alpha and Switch-Beta. Users on VLAN 20 attached to Switch-Alpha report complete loss of connectivity to servers on VLAN 20 attached to Switch-Beta. Additionally, syslog messages indicate that untagged management frames transmitted from Switch-Alpha on VLAN 10 are being received on VLAN 30 on Switch-Beta across trunk interface GigabitEthernet 0/1.

An inspection of the interface configuration reveals:
- Switch-Alpha (GigabitEthernet 0/1): Mode: Trunk, Native VLAN: 10, Allowed VLANs: 10, 20, 30
- Switch-Beta (GigabitEthernet 0/1): Mode: Trunk, Native VLAN: 30, Allowed VLANs: 10, 30

Which TWO configuration adjustments must be implemented on Switch-Beta to resolve both issues? (Select TWO.)

A network technician is troubleshooting an existing Category 6 copper cable run that connects a workstation to a access switch. The link constantly fails to negotiate at Gigabit speed, dropping to 100 Mbps with frequent CRC frame errors under heavy traffic load. A wiremap test confirms that all eight conductors are properly pin-terminated at both ends according to TIA/EIA 568B standards with no open or short circuits. Which diagnostic instrument should the technician use to measure frequency-dependent parameters such as Near-End Crosstalk (NEXT) and return loss to determine if the run meets Category 6 specifications?

A network technician is deploying a new smart HVAC controller on VLAN 55 ($172.16.55.0/24$). The corporate DHCP server is centralized on VLAN 10 ($172.16.10.10/24$). Upon booting up the controller, running a network diagnostics command shows the following output:

IPv4 Address. . . . . . . . . . . : 169.254.108.42
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : Yes

Other existing hosts on VLAN 10 obtain their DHCP leases without issues. Which of the following is the MOST likely cause of the HVAC controller failing to acquire an IP address?

A financial services firm performs a full system backup every Sunday at 00:00. From Monday through Saturday, the network administration team performs cumulative differential backups every night at 23:00. If a primary database storage array suffers a total hardware failure on Friday at 14:00, which sequence of backup restorations will recover the system to its most recent available state with the shortest recovery time?

A network administrator is troubleshooting an issue on a Linux server hosting an internal HTTPS application. Users report that they cannot access the website from remote workstations, even though the server is powered on and reachable via `ping`. The administrator executes a command-line utility on the Linux server to inspect active network socket bindings and receives the following output:

State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
LISTEN 0 128 127.0.0.1:443 0.0.0.0:* users:(("httpd",pid=2048,fd=3))

Based on this output snippet, which of the following is the root cause preventing remote clients from accessing the web service?