Free Cisco 800-150 Practice Exam with Questions & Answers | Set: 3

The Data Link Layer (Layer 2) of the OSI model is responsible for node-to-node data transfer and plays a crucial role in error detection and media access control. It ensures that data frames are transmitted to the correct device on a local network segment.​

This layer is divided into two sublayers:​

Logical Link Control (LLC):Manages frame synchronization, flow control, and error checking.

Media Access Control (MAC):Controls how devices on the network gain access to the medium and permission to transmit data.

Together, these sublayers ensure reliable data transmission by detecting and possibly correcting errors that may occur in the Physical Layer. They also manage how devices share the transmission medium, preventing collisions and ensuring orderly communication.​

The commandcopy tftp: running-configis used to retrieve a configuration file from a TFTP server and merge it with the current running configuration of a Cisco device. Thisoperation is additive, meaning it integrates the new configuration commands into the existing running configuration without removing any pre-existing commands unless explicitly overridden.​

This method is particularly useful when restoring configurations to a replacement device, as it allows for the seamless integration of necessary settings without disrupting the current operational state.​

In contrast, usingcopy tftp: startup-configwould overwrite the startup configuration file, which could lead to unintended consequences upon the next device reload. The optionsload tftp: running-configandmerge tftp: running-configare not valid Cisco IOS commands.​

Asubnet maskis a 32-bit number used in IP networking to divide an IP address into network and host portions. This division is crucial for routing traffic within and between networks. The subnet mask works in tandem with the IP address to identify which part of the address refers to the network and which part refers to the host. This distinction allows for efficient IP address allocation and routing.​

For example, in the IP address 192.168.1.10 with a subnet mask of 255.255.255.0, the first three octets (192.168.1) represent the network portion, while the last octet (10) identifies the specific host within that network.​

Kickstart Image→ Specialized bootloader that initializes the hardware

System Image→ Contains the full NX-OS kernel and operating system

Global configuration command mode→ Provides access to the broadest range of commands that affect the device as a whole

EXEC command mode→ Allows for displaying device status and configuration information

This knowledge is covered underCisco IOS/NX-OS Software Basicsin the FLDTEC training:

Kickstart Image:Alightweight bootloader image that initializes hardware and launches the system image. It's comparable to ROMMON in traditional IOS devices.

System Image:Includes the full NX-OS operating system, services, drivers, and kernel required to run the device.

Global Configuration Mode:After entering privileged EXEC mode (enable), this mode allows changes to system-wide settings such as interfaces, routing protocols, and VLANs.

EXEC Mode:Has two levels—User EXECandPrivileged EXEC. User EXEC provides limited diagnostic commands, while Privileged EXEC allows more extensive system views (show commands, reload, etc.).

Understanding these layers is essential when maintaining or restoring NX-OS devices in field environments.

Cloud-based managementis a core feature of Cisco Merakiswitches and significantly simplifies the device replacement process. When a failed switch is replaced:

The new hardware can be claimed in the Meraki dashboard.

The previously assigned configuration is automatically applied to the replacement device.

This eliminates the need for local reconfiguration and ensures continuity with minimal manual effort.

This centralized approach ensures that configurations are stored securely and consistently applied across devices.

Theideal resistance rangefor ESD wrist straps isbetween 1 and 10 megaohms. This range is sufficient to safely discharge static electricity from the technician to ground, while not allowing an abrupt discharge that could damage sensitive electronic components.

Values below 1 megaohm may result in a rapid discharge, risking damage.

Valuesabove 10 megaohms may not discharge static efficiently enough.

Within theFLDTECtraining, especially underMaintenance and RMA Procedures, there is a strong emphasis on safely transferring and adapting configurations from failed or decommissioned devices to replacement units.

The official guidance includes the following:

"When reusing a configuration from an old device, make sure to retain the necessary security elements such as username entries. This ensures the replacement device is still accessible under the correct user credentials."

Here's a breakdown of why the correct answer isB:

A. Remove all configurations under line vty 0 4:This would eliminate remote access settings, making it harder to manage the device.

B. Retain all username entries:Correct. Keeping the username entries ensures continued secure access and avoids loss of administrative control.

C. Keep all access-list commands intact:Not always required — ACLs are often tailored to interface-specific settings or environments which may differ between devices.

D. Add the enable password cisco command:Not a best practice. Default passwords (like cisco) should be avoided for security reasons, and it's not required if enable secret is already in use.

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OnCisco Meraki switches,Stack Port 1(along with Stack Port 2) is used to form aphysical stacking connectionbetween multiple switches. These stack ports arededicated high-speed interconnectsthat enable multiple switches to operate as a single logical switch.

The stacking topology depends on the number of switches, but Stack Port 1 serves as one side of this high-speed inter-switch communication channel — not for management or cloud access.

In theFLDTEC curriculum, technicians are trained on physical tools essential for support in the field. These tools and their uses are explained as follows:

Flash Card Reader:Used with removable CompactFlash cards commonly found in older Cisco routers and switches. These cards hold the IOS image or config files.

USB Thumb Drive:Used for transferring IOS files or configs directly to and from Cisco devices that support USB storage. Convenient for portable backups.

RJ-45 Ethernet Loopback Connector:A diagnostic tool that loops the signal back into the port. Helps verify port functionality by simulating a live Ethernet connection.

RJ-45 Coupler:Allows two patch cables to be connected, effectively extending the reach of a cable — useful in setups where a single cable is not long enough.

After disconnecting the network cable from an SFP transceiver, theimmediate next step is to reinstall the dust plugsinto the optical bores. This action prevents contamination from dust or debris that can damage the optical interfaces or degrade performance.

It’s important to protect the exposed optical port before handling the rest of the transceiver module. Dust plugs help maintain the integrity of the component until a new cable or module is connected.