Cisco 100-490 Practice Test - Questions Answers, Page 6

Loopback plugs are used to test the physical connections and configurations of network equipment. In a 56K modem loopback plug, the following pins are looped to create a test signal:

Pins 1 and 7 (Transmit): Looping the transmit pins back to each other allows the device to test its own signal transmission.

Pins 2 and 8 (Receive): Looping the receive pins back to each other allows the device to test its ability to receive its own signal.

Understanding RJ-45 Wiring:

RJ-45 connectors are standardized and have a specific pinout for various applications like Ethernet networking and analog telephony connections. You can find resources online that show the standard RJ-45 color coding and pin assignments.

A standard UTP (Unshielded Twisted Pair) cable contains4 pairsof copper wires, which are twisted together to help cancel out electromagnetic interference and support data transmission across various networking and telecommunications applications1.Each pair consists of two individual copper cables twisted around each othe

The configuration register on Cisco devices is a 16-bit value, typically represented in hexadecimal notation (e.g., 0x2102). The lowest four bits (bits 0-3) of this value are designated as the boot field.

The Boot Field's Importance:

The boot field determines how the device will load its operating system (Cisco IOS) during the startup process. Here's a basic breakdown of common boot field values:

0x0: Stay at the ROMmon prompt.

0x1: Boot from ROM (often used for troubleshooting or recovery).

0x2 - 0xF: Load the operating system based on settings in the startup configuration (NVRAM) or from a network server if specified.

Example:

A configuration register value of 0x2102 indicates that the boot field is 0x2 (the last digit). This is a common default setting, instructing the device to load the Cisco IOS image from Flash memory.

Cisco Configuration Register Detailed Explanation: [invalid URL removed]

Configuration Register Settings (Cisco): https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/configuration-register-cisco-ios

The decompressed form of Cisco IOS Software and the running configuration are stored inDRAM (Dynamic Random-Access Memory)on Cisco devices. DRAM is used as the main memory for the device, where the operating system runs and the running configuration is stored. When a Cisco device boots up, the IOS image is decompressed and loaded into DRAM, and the running configuration is also held in this memory type.It's important to note that DRAM is volatile memory, which means its contents are lost when the device is powered off or restarted12.Reference:=Maintaining System Memory Configuration Guide, Cisco IOS Release 15M&T - Cisco,Types of memory on a Cisco device - Study-CCNA

Cisco routers can be readily configured to act as TFTP servers, allowing them to provide Cisco IOS images or configuration files to other devices. Here's why this is the correct answer:

Software Support: Cisco IOS includes built-in support for the TFTP protocol, making it easy to set up a TFTP server on a router.

Storage Capacity: Routers typically have flash memory where IOS images and other files can be stored, making them suitable repositories for TFTP transfers.

Network Accessibility: Routers play a central role in networks, making them an accessible location for TFTP file transfers.

Why other options are incorrect:

Cisco Content Engine: Content Engines are specialized network appliances designed for caching and accelerating web content delivery. They typically don't have functionality for acting as generic TFTP servers.

Modem: Modems primarily modulate/demodulate signals to facilitate communication over traditional telephone lines. They lack the software capabilities to run a TFTP server.

CSU/DSU: Channel Service Unit/Data Service Units are devices used to interface with digital leased lines. They don't possess the necessary software to run a TFTP server.

The tftpdnld command in Cisco IOS is specifically designed for recovering or upgrading a system image. Here's how it's the most effective method:

Purpose: The tftpdnld command directly initiates a TFTP download of a new system image and stores it in memory. This is ideal for replacing a corrupt image or upgrading to a newer version of Cisco IOS.

ROMmon: The tftpdnld command can often be used from ROMmon mode, which is essential when the existing image is unusable.

Efficiency: It streamlines the image transfer process specifically using TFTP, which is commonly used for Cisco IOS images.

Why other options are less ideal:

USB storage: While some newer Cisco devices may allow direct loading of an IOS image from USB, this isn't universally supported and often requires specific boot commands.

FTP: FTP (File Transfer Protocol) can be used for file transfers, but it's not as commonly used as TFTP in the context of Cisco IOS image recovery. The tftpdnld command offers a more tailored solution for this purpose.

the xmodem command: XMODEM is a legacy file transfer protocol that is slower and less reliable than TFTP, especially for larger files like Cisco IOS images.

The commands to copy a saved configuration to RAM on Cisco devices are:

copy startup-config running-config: This command is used to copy the startup configuration (saved configuration) into the running configuration (current configuration in RAM).It is typically used when you want to restore the device to a previously saved configuration after changes have been made1.

copy tftp running-config: This command allows you to copy a configuration file from a TFTP server directly into the running configuration of the device.It's useful for applying a new configuration or for restoring a configuration from a backup located on a TFTP server1.

The other options listed are not valid for copying a saved configuration to RAM:

copy running-config startup-configcopies the current running configuration to the startup configuration, which is the opposite of what's asked.

copy running-config tftpis used to save the running configuration to a TFTP server, not to copy to RAM.

copy tftp startup-configwould copy a file from a TFTP server to the startup configuration, not to the running configuration in RAM.

To assign a static IP address to the Ethernet port on a computer, particularly in a Windows environment, you would navigate to the Network and Sharing Center. From there, you would access the adapter settings, select your local area connection, and then enter the properties for Internet Protocol Version 4 (TCP/IPv4). Within the properties, you would choose the option to use a specific IP address and enter the desired IP information, including the IP address, subnet mask, and default gateway. This process sets a static IP address for the Ethernet port, ensuring that the computer will always use the same IP address every time it connects to the network, which is useful for various network configurations and applications.Reference:=How to Assign a Static IP Address in Windows 10 or Windows 11 - How-To Geek,How to Set Up a Static IP Address | PCMag

The AUX (Auxiliary) port on a router is used for dial-in access for CLI (Command Line Interface) management purposes. It is typically connected to a modem and allows an administrator to dial into the router's CLI for remote management. This port is not used for passing normal network traffic, which differentiates it from other ports like Fast Ethernet or Gigabit Ethernet that handle regular data flow. The AUX port is specifically designed as a backup async port for management access1.