800-150 Practice Questions

Inability to manage or control switch functions → Supervisor module

Failure to maintain optimal temperatures → Fan module

Loss of connectivity on specific ports → Line card

Inability to establish fiber optic connections → Transceivers

Degraded internal data transfer between line cards → Fabric module

From the FLDTEC training materials, Cisco MDS switches are built for high availability and

redundancy, but field technicians must know which component impacts what function:

✅ Supervisor Module: Manages control plane functions — a failure results in loss of system-level

management or redundancy.

✅ Fan Module: Essential for cooling — failure here leads to overheating and thermal alarms.

✅ Line Card: Provides connectivity — port failures or loss of interface status originate from faulty

line cards.

✅ Transceivers (SFP/QSFP modules): Responsible for optical transmission — failure leads to fiber

optic link issues.

✅ Fabric Module: Critical for switching between line cards — its failure leads to degraded or

disrupted internal traffic paths.

These mappings help technicians isolate the source of faults and proceed with the correct RMA or

replacement procedure.

Cisco Webex Calling is a cloud-based, enterprise-grade PBX (Private Branch Exchange) solution

designed to provide comprehensive voice communication services via the Webex cloud platform. It

enables IP phones and softphones to register to the cloud, allowing for centralized call control,

voicemail, and collaboration features without the need for an on-premises call manager.

Cisco Hosted Collaboration Solutions are partner-hosted services.

Webex Meetings supports virtual video conferencing.

Webex Teams (now part of Webex App) supports messaging and collaboration, not PBX functionality.

Reference: Supporting Cisco Devices for Field Technicians (FLDTEC) – Cisco Equipment and Related

Hardware

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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.​

Reference: Supporting Cisco Devices for Field Technicians (FLDTEC) – Cisco IOS Software Basics

Step 1 → Performs power-on self-test (POST)

Step 2 → Loads and runs bootstrap code (firmware)

Step 3 → Finds and loads the Cisco IOS software

Step 4 → Finds and loads the configuration

Step 5 → Runs the configured Cisco IOS software

This startup process is thoroughly described in the FLDTEC course and aligns with Cisco's standard IOS

boot process:

POST (Power-On Self-Test): Verifies hardware functionality including memory and interfaces. This

occurs immediately upon powering the device.

Bootstrap Code Execution: Bootstrap is a small program in ROM that initiates the boot process.

Cisco IOS Loading: Bootstrap locates and loads the IOS from flash memory or another source (e.g.,

TFTP).

Configuration Loading: The router then loads the startup-config from NVRAM (if available).

IOS Execution: Once the configuration is loaded, the device enters operational mode and executes

the IOS with the loaded config.

This sequence is vital for field technicians to understand for troubleshooting boot failures or

performing device recoveries.

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The FLDTEC course teaches that TFTP is a lightweight file transfer protocol often used in Cisco devices

for transferring configuration files or IOS images, especially in environments where simplicity is more

critical than security:

Advantages:

It has a lightweight footprint, making it easy to use and configure.

Useful for transferring small files such as backup configs or small IOS images.

Disadvantages:

Lacks encryption and does not support authentication, making it insecure for sensitive or production

environments.

Not efficient for large file transfers due to its limited feature set and reliance on UDP (User Datagram

Protocol).

This makes TFTP a good fit for trusted internal networks where simplicity is preferred over robust

security.

A subnet mask is 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.​

Reference: Supporting Cisco Devices for Field Technicians (FLDTEC) – Cisco IOS Software Basics

An on-premises deployment model minimizes dependence on internet connectivity for core

collaboration functions. In this model, all critical services, including call control, messaging, and

conferencing, are hosted within the organization's local infrastructure. This ensures that internal

communication services remain operational even if internet connectivity is lost.​

In contrast, cloud-based deployments (Options A and C) and Hosted Collaboration Solutions (Option

D) rely on internet connectivity to access services hosted externally, making them more susceptible

to internet outages.​

Reference: Supporting Cisco Devices for Field Technicians (FLDTEC) – Cisco Licensing and Smart

Licensing​

Component to configure → interface

Interface type → FastEthernet

Port → 1

Slot → 0

This command structure is part of the Device Configuration and Verification section in the FLDTEC

course. It teaches how to navigate and configure interfaces on Cisco devices using the IOS CLI:

interface is the global configuration mode command to begin configuring a network interface.

FastEthernet specifies the type of interface (could also be GigabitEthernet, Serial, etc.).

0/1 represents the slot/port structure used on Cisco devices:

The first digit (before the slash) is the slot number.

The second digit (after the slash) is the port number within that slot.

This structure allows Cisco to modularly address interfaces, especially in devices with multiple slots

or module-based configurations.

PING → Sends ICMP echo request packets to verify connectivity Telnet → Allows virtual terminal connections with unencrypted traffic SSH → Provides secure, encrypted remote access to network devices IP address configuration → Requires the PC and Cisco device to be in the same subnet for direct connection These tools and their functions are covered under “Device Configuration and Verification” in the FLDTEC course: PING: Utilized to test basic network connectivity using ICMP echo request/reply messages. It confirms whether a device is reachable and measures the round-trip time. Telnet: A protocol that allows for remote device access but transmits data in plaintext, which makes it insecure. It's typically disabled by default on modern Cisco devices due to security concerns. SSH (Secure Shell): Replaces Telnet as the preferred method for secure CLI access. It encrypts the session, protecting sensitive information such as login credentials. IP Address Configuration: For direct device access via the same local network, both the PC and the Cisco device must be in the same subnet. This allows the use of tools like browser-based GUIs or terminal emulators when connecting directly.

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 under Cisco IOS/NX-OS Software Basics in the FLDTEC training: Kickstart Image: A lightweight 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 EXEC and Privileged 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.