640-692 Sample Questions & Answers

This statement is false. Both a PC's NIC and a router's Ethernet port are DTE (Data Terminal Equipment) devices, which use the same pins for transmitting and receiving (MDI). To connect two like devices, a crossover cable is required to swap the transmit and receive pairs. A straight-through cable would be used to connect a PC to a switch (DCE/MDI-X device). While modern devices often support Auto-MDI/MDI-X, the standard cabling rule requires a crossover.

On many modular Cisco chassis, including the Catalyst 4500 series, the slots designated for supervisor engines are physically marked to prevent incorrect installation. This often includes a colored outline (typically red or yellow) around the slot opening on the chassis frame and specific labeling indicating it is a supervisor slot. These visual cues are designed for technicians to quickly and accurately identify the correct placement for these critical components.

The status 'administratively down' specifically means that the shutdown command has been issued in the interface's configuration mode. This is a deliberate action by an administrator to disable the port. To bring the interface up, the no shutdown command must be used. Other issues like a missing cable or speed mismatch would result in a line protocol status of 'down', but the administrative status would be 'up'.

Pin 1 (Receive Ring) is looped to Pin 4 (Transmit Ring).

Pin 2 (Receive Tip) is looped to Pin 5 (Transmit Tip).

The verify /md5 command is the specific IOS tool used to compute an MD5 checksum for a file stored in a file system like flash memory. The technician would run this command, specifying the full path to the IOS image file, and then compare the output hash with the one published on the Cisco Software Download site to ensure the file has not been corrupted or tampered with.

For most Cisco hot-swappable modules and line cards, the primary serial number label is placed on the printed circuit board (PCB) itself, often on the top or bottom edge. To view it without fully removing the card and disrupting service, a technician must typically loosen the captive screws, use the ejector levers to unseat the card from the backplane, and slide it partially out of the chassis. The sticker will then be visible on the exposed part of the board.

The Cisco IOS boot sequence follows a specific order. First, it checks the startup-config for boot system commands. If a valid command exists, it will attempt to load the specified image. Since the technician did not change this variable, the router will use the old command pointing to the older IOS version. If no boot system command is found, it will then proceed to load the first valid IOS image from flash.

When using a USB-to-Serial adapter, the operating system assigns a virtual COM port number (e.g., COM3, COM4, COM5). A very common mistake is for the terminal software (like PuTTY) to default to COM1, while the adapter is active on a different port. The technician must check the Windows Device Manager (or equivalent) to find the correct COM port assigned to the adapter and configure the terminal software to match it. This is the most frequent cause of a 'no output' issue when all other factors seem correct.

The standard troubleshooting process is: 1. Identify the problem. 2. Establish a theory of probable cause. 3. Test the theory to determine the cause. 4. Establish a plan of action. 5. Implement the solution. 6. Verify functionality. 7. Document findings. Once a theory is formed (e.g., 'I believe it's a faulty cable'), the very next step is to test that specific theory (e.g., by swapping the cable with a known-good one) to confirm or deny it before creating a larger plan of action.

This option follows the correct procedure for a hot-swappable component. Since the switch has a redundant, working power supply, the failed unit can be replaced without powering down the switch. The correct sequence is: 1. Ensure safety with an ESD strap. 2. Disconnect power from ONLY the failed module. 3. Physically swap the module. 4. Reconnect power to the new module. 5. Verify operation using the status LEDs on the power supply itself (e.g., a solid green light). This process meets the requirement of minimal downtime.