Cisco 100-490 Practice Test - Questions Answers, Page 2

The show inventory command in Cisco IOS is designed specifically to display detailed hardware inventory information about a Cisco device. This includes:

Component Name: The name or type of each module or card installed.

PID (Product ID): The unique product identifier for the module.

VID (Version ID): The version identifier for the module.

Serial Number: The unique serial number assigned to the module.

Why other options are incorrect:

show chassis: Some Cisco devices support a show chassis command, but the information provided usually focuses on the physical chassis rather than detailed component inventory.

show items: This is not a standard Cisco IOS command.

show router: This command doesn't provide the level of granular hardware information that show inventory does.

Topic 4, Service-related Knowledge

In the context of IPv4 addresses, a host address is an identifier for a specific device on a network. The addresses 10.1.1.20 and 192.168.10.15 are both within ranges typically reserved for private networks, making them suitable for assignment to host computers within a local network. Address 292.10.3.4 is not a valid IPv4 address because the first octet is beyond the maximum value of 255. Address 255.255.255.255 is reserved for broadcast messages to all hosts on the local network, and 0.0.0.0 is used to denote an unspecified address, often indicating the absence of an IP address123. Reference := IP address, Network address, and Host address Explained, IP address - Wikipedia, Understanding IP Addresses: How IP Addressing Works | ENP

The ping command is specifically designed to test network connectivity and reachability. Here's how it works:

Echo Request: The ping command sends an ICMP (Internet Control Message Protocol) Echo Request packet to a specified destination IP address or hostname.

Echo Response: If the target host is reachable, it will respond with an ICMP Echo Reply packet.

Analysis: The ping command measures the round-trip time (RTT) between the source and destination. It also reports statistics like packet loss and response times.

Why other options are incorrect:

echo: In some command-line environments, the echo command is used to display text on the screen and does not relate to network testing.

access: This is a general term and does not refer to a specific command for sending echo requests.

connect: Some tools use the connect command to establish a TCP connection to a remote host, but it doesn't directly utilize ICMP echo packets like the ping command.

ping (Wikipedia): https://en.wikipedia.org/wiki/Ping_(networking_utility)

The show cellular unit network command in Cisco IOS is used to view detailed information about the cellular modem and the network it's connected to. Here's the type of information this command usually displays:

Network Status: Whether the device is registered on the cellular network.

Carrier Information: The name of the cellular network provider.

Technology: The cellular technology in use (e.g., 3G, 4G/LTE).

Signal Strength: Signal strength indicators like RSSI and RSCP.

Cell Site Information: Data about the cell tower or base station the device is connected to.

IP Address: The IP address assigned to the cellular interface.

Why other options are less likely:

show cellular unit radio: Provides information about the radio module itself, such as its state and power levels.

show cellular unit hardware: Focuses on hardware-level information of the cellular unit.

show cellular unit profile: Displays configuration details of the cellular profile used to connect to the network.

Cisco command documentation for different show cellular options: https://www.cisco.com/c/en/us/td/docs/routers/wireless-wan/Cisco-Catalyst-Cellular-Gateways/cisco-cellular-gateways-command-reference-guide/m-show_commands.pdf

Microsoft Notepad is the preferred text editor for working with Cisco configuration files and other simple text documents for several reasons:

Plain Text Focus: Notepad is designed specifically for plain text editing. It does not add any formatting, hidden characters, or metadata that could interfere with the configuration file's structure.

Cisco Syntax Compatibility: Cisco configurations rely on specific syntax and spacing. Notepad preserves these elements accurately.

Universality: Notepad is a basic text editor included in all versions of Windows, ensuring accessibility and eliminating the need for additional software.

Why other options are not ideal:

Microsoft Word: Word is a word processor and includes formatting, fonts, and other features that are not compatible with Cisco configuration files. This formatting can corrupt the configuration.

Microsoft Access: Access is a database management system, not suited for text file editing.

Microsoft Excel: Excel is a spreadsheet application and adds its own structure and formatting that conflicts with configuration file formats.

The ipconfig command in Windows is used to display and manage network configuration information for the local computer. Here's what it shows:

IP Address: The IPv4 address assigned to each network adapter.

Subnet Mask: The subnet mask used to determine the network segment.

Default Gateway: The IP address of the router used to send traffic to other networks.

Other Information: DNS servers, DHCP server details, and more.

Incorrect options:

ipconfiguration: This is not a recognized command in the Windows command prompt.

ip configuration: This is also not a recognized command.

ip config: While it might seem like it should work, Windows uses ipconfig without spaces.

How to use ipconfig:

Open the Windows command prompt (Search for 'cmd')

Type ipconfig and press Enter.

Microsoft documentation on ipconfig: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/ipconfig

A SmartJack is a type of Network Interface Device (NID) that provides advanced features beyond simple electrical connection. Two of its functions include:

* Regenerating the signal: Similar to a repeater, a SmartJack can buffer and regenerate the signal to compensate for signal degradation that occurs during line transmission. This helps maintain signal integrity over longer distances1.

* Signal conversion: A SmartJack may also provide signal conversion, which involves converting codes and protocols to the type needed by the customer equipment. This can include converting framing types or other signal characteristics to ensure compatibility with the connected devices1.

The other options listed are not primary functions of a SmartJack:

* Operating at Layer 2 of the OSI model is not a function of a SmartJack; it is a characteristic of network devices like switches and bridges.

* Providing channel testing (D) is not a standard function of a SmartJack; however, SmartJacks enable phone companies to remotely test customer wiring without a site visit2.

* Acting as a concentration point for dial-in and dial-out connections (E) is not a function of a SmartJack; this is typically a function of devices like modems or access servers.

1. It is built on a client-server model architecture and uses separate control and data connections between the client and the server2. Here are the explanations for the correct answers:

* B: The copy running-config ftp: command is used to copy the running configuration from a router to an FTP server or vice versa. This is a common method for backing up and restoring configurations on Cisco devices1.

* E: FTP typically requires authentication, which means a Cisco router acting as an FTP client must be configured with the appropriate username and password to access an FTP server. This ensures secure file transfer and access control1.

The other options are incorrect because:

* A: FTP is not used to load Cisco IOS Software to a router in ROMMON mode; this is typically done using TFTP or Xmodem.

* C: While a router can act as an FTP server, this is not a description of FTP itself.

* D: FTP uses TCP as its transport protocol, not UDP. FTP needs the reliability that TCP provides because it ensures the complete and accurate transfer of files1.

An RJ-45 56K loopback plug is used to test the functionality of network ports, particularly for T1/56K lines. The correct loopback wiring for such a plug involves looping pins 1 and 4, as well as pins 2 and 5. This configuration allows the device to send and receive signals on the same wire pairs, effectively testing the transmit and receive paths of the port1.