Cisco Updated 800-150 Exam Questions and Answers by taran

A → Power supply modules

B → Fan tray assembly

C → Line card slots 1 and 2

D → Supervisor modules

E → Line card slots 5, 6, and 7

The power supply units (A) are at the top, the fan tray (B) is a vertical module on the left, line cards (C and E) span multiple slots horizontally, and supervisor modules (D) are typically placed centrally for control functions.

In theFLDTEC courseunderCisco Modular Hardware Overview, the Cisco Catalyst 9400 series is broken down into clearly defined FRU zones:

Power Supply Modules (A):Located at thetop of the chassis, these provide redundant, hot-swappable power to the switch.

Fan Tray Assembly (B):Mounted vertically on the left, this ensures proper cooling and airflow throughout the chassis.

Line Card Slots 1 and 2 (C):Located in the upper section for network expansion.

Supervisor Modules (D):Positioned centrally, they handle control plane operations, management, and switching logic.

Line Card Slots 5, 6, and 7 (E):Lower slots for high-density port expansion.

Correct FRU identification ensures successful maintenance, upgrades, and hardware replacement during field operations.

Theshow flash:command is used todisplay the contents of the device's flash memory, which is where the Cisco IOS image is typically stored. By issuing this command, a technician can verify available space and determine whether there is enough capacity to accommodate a new IOS image before initiating an upgrade or image replacement process.

This command provides a detailed listing of files, their sizes, and the total and available memory space within the flash file system.

show file-systemlists all available file systems but doesn’t detail their content.

show memoryshows runtime memory usage (RAM), not flash memory.

show storageis not a standard IOS command.

Online Insertion and Removal (OIR)is a feature supported by Cisco ASR routers that allows for the insertion and removal of hardware components, such as line cards and modules, while the router is operating. Thiscapability enables maintenance and upgrades without the need to power down the system, thus minimizing network downtime.​

Key aspects of OIR include:​

Seamless Operation:OIR allows for hardware changes without interrupting the router's operation.​

Preservation of Routing Information:The router maintains all routing information and active sessions during the insertion or removal process.

Administrative Shutdown:While not mandatory, it is recommended to administratively shut down the interfaces associated with the component being removed to ensure a graceful transition.​

This feature is particularly beneficial in high-availability environments where maintaining continuous network service is critical.​

When installing a fan module in a Cisco Nexus fixed-configuration switch, it's crucial to ensure that theairflowdirection of the new fan matches the existing airflow configuration. Mismatched airflow directions can lead to inefficient cooling or even overheating of components, potentially affecting the performance or lifespan of the switch.

Cisco offers fan modules infront-to-backorback-to-frontairflow variants, and consistency is required for proper thermal management. These modules are also typically hot-swappable, meaning powering down the switch is not necessary.