Ultimate Guide to Prepare Free Cisco 100-490 Exam Questions and Answer
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Cisco 100-490 exam is a certification exam designed for IT professionals who specialize in routing and switching network devices. 100-490 exam is aimed at validating the knowledge and skills required to support Cisco routers and switches. 100-490 exam covers a wide range of topics, including network fundamentals, LAN switching technologies, routing technologies, WAN technologies, infrastructure services, infrastructure security, and infrastructure management. 100-490 exam format consists of multiple-choice questions, drag-and-drop questions, and simulation-based questions.
NEW QUESTION # 42
Which two IPv4 addresses can be assigned to a host computer? (Choose two.)
- A. 10.1.1.20
- B. 192.168.10.15
- C. 292.10.3.4
- D. 0.0.0.0
- E. 255.255.255.255
Answer: A,B
NEW QUESTION # 43
Which command displays a list of file systems that are available on Cisco devices?
- A. show file system
- B. show directory
- C. show version
- D. show memory
Answer: A
Explanation:
Section: Cisco IOS Software Operation
NEW QUESTION # 44
Which type of memory is erased on a Cisco device when rebooted?
- A. flash
- B. DRAM
- C. NVRAM
- D. PVDM
Answer: B
Explanation:
DRAM, or Dynamic Random-Access Memory, is the type of memory that is erased when a Cisco device is rebooted. DRAM is used to store the running configuration and routing tables of the device. Since DRAM is volatile memory, its contents are lost when the device is powered down or restarted. This is in contrast to non-volatile memory types like flash and NVRAM, which retain their contents even after a reboot1. Reference := Types of memory on a Cisco device - Study-CCNA
NEW QUESTION # 45
Which two Cisco Nexus 3400 Series switches support 400-Gbps Ethernet ports? (Choose two.)
- A. Cisco Nexus 34200YC-SM
- B. Cisco Nexus 3408-S
- C. Cisco Nexus 3464C
- D. Cisco Nexus 3432D-S
- E. Cisco Nexus 34180YC
Answer: B,D
Explanation:
The Cisco Nexus 3432D-S and Cisco Nexus 3408-S are part of the Cisco Nexus 3400 Series switches that support 400-Gbps Ethernet ports. The Cisco Nexus 3432D-S is designed with 32 ports of 400G, providing high-density and high-throughput capabilities1. The Cisco Nexus 3408-S offers flexibility with 100G or 400G Line-Card Expansion Modules (LEMs), allowing for configurations with 32 ports of 400G2. These switches are engineered for data centers requiring high performance, low latency, and power efficiency, with the Cisco Nexus 3432D-S offering industry-leading performance-per-watt power efficiency at low latency1.
NEW QUESTION # 46
Which command sends an echo request packet to the target host and then waits for an echo response message?
- A. echo
- B. access
- C. connect
- D. ping
Answer: D
NEW QUESTION # 47
Which device is able to be configured as a TFTP server?
- A. Cisco Content Engine
- B. Cisco router
- C. CSU/DSU
- D. modem
Answer: B
Explanation:
A Cisco router can be configured to act as a TFTP (Trivial File Transfer Protocol) server. TFTP is a simple protocol used to transfer files without the need for authentication. On a Cisco router, the tftp-server command is used to designate the router as a TFTP server, allowing it to manage file transfers to and from connected devices. This is particularly useful for tasks such as updating the router's firmware or backing up configuration files. Neither CSU/DSU, modem, nor Cisco Content Engine are typically used as TFTP servers. Reference := The ability to configure a Cisco router as a TFTP server is documented in Cisco's support forums and knowledge base articles
NEW QUESTION # 48
Which Xmodem option enhances error checking of an image copied to flash memory?
- A. -e
- B. -x
- C. -c
- D. -r
Answer: A
Explanation:
The Xmodem option that enhances error checking when copying an image to flash memory is the -e option. This option enables error checking to ensure the integrity of the file being transferred. Xmodem is a protocol that uses checksums or cyclic redundancy checks (CRC) to detect errors during the transfer. The -e option specifically invokes CRC error checking, which is more reliable than the basic checksum method, providing an additional layer of verification that the copied image is free from errors. Reference := The information is based on standard practices for using the Xmodem protocol for file transfers in networking devices, as outlined in Cisco's documentation and support forums1.
NEW QUESTION # 49
Which bits represent the boot field in the configuration register value?
- A. lowest four bits
- B. lowest two bits
- C. highest four bits
- D. highest two bits
Answer: A
Explanation:
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.
Reference:
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
NEW QUESTION # 50
Which device is a DTE device?
- A. router
- B. DSL modem
- C. CSU/DSU
- D. cable modem
Answer: A
Explanation:
A DTE (Data Terminal Equipment) device is an end instrument that converts user information into signals or reconverts received signals. In the context of networking, a router can be considered a DTE device because it is typically at the user end of a user-network interface and serves as a data source or destination. It communicates with the data circuit-terminating equipment (DCE), such as a modem, to send and receive data across the network345.
NEW QUESTION # 51
Which command initiates the copying of a Cisco IOS image to a Cisco device?
- A. copy xmodem flash
- B. copy flash tftp
- C. copy tftp flash
- D. copy tftp nvram
Answer: C
Explanation:
Section: Service-related Knowledge
Explanation
NEW QUESTION # 52
Which method is the fastest way to recover a software version that supports a USB flash port on a Cisco device?
- A. copy tftp flash: command
- B. tftp command
- C. xmodem transfer command
- D. copy command with USB memory
Answer: D
NEW QUESTION # 53
Which command sends an echo request packet to the target host and then waits for an echo response message?
- A. echo
- B. access
- C. connect
- D. ping
Answer: D
Explanation:
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.
Reference:
ping (Wikipedia): https://en.wikipedia.org/wiki/Ping_(networking_utility)
NEW QUESTION # 54
Which address facilitates the routing of packets over an IP network?
- A. transport
- B. MAC
- C. physical
- D. network
Answer: D
NEW QUESTION # 55
The pins on an RJ-45 cable plug are numbered from 1 through 8. When the metal pins of the plug are facing toward you, pin 1 is the leftmost pin. Which two sets of pins are looped on an RJ-45 56K loopback plug? (Choose two.)
- A. pins 2 and 7
- B. pins 1 and 7
- C. pins 1 and 4
- D. pins 2 and 8
- E. pins 2 and 5
Answer: C,E
NEW QUESTION # 56
Which command initiates the transfer of a Cisco IOS image over IP from ROMMON?
- A. Xmodem
- B. copy flash: tftp:
- C. tftpdnld
- D. copy tftp: flash:
Answer: C
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 57
Which two statements about a SmartJack are true? (Choose two.)
- A. It provides channel testing.
- B. It provides signal conversion.
- C. It operates at Layer 2 of the OSI model.
- D. It acts as a concentration point for dial-in and dial-out connections.
- E. It regenerates the signal to compensate for signal degradation from line transmission.
Answer: B,E
Explanation:
SmartJacks are specialized devices used in telecommunications, particularly for T1/E1 lines. Here's why the correct answers make sense:
Signal Conversion: SmartJacks can convert between different signaling types (e.g., AMI to B8ZS). This is necessary because different telecommunication lines may use varying signaling standards.exclamation Signal Regeneration: As signals travel over long distances, they can weaken and degrade.expand_more SmartJacks help regenerate the signal, ensuring that it maintains its strength and integrity throughout the transmission.expand_more Why other options are incorrect:
Concentration point: SmartJacks are not primarily used as concentration points for dial-in/out connections.exclamation This function is typically handled by modems or other specialized devices.exclamation Layer 2 operation: SmartJacks primarily operate at Layer 1 (Physical Layer) of the OSI model, focusing on the physical transmission of signals.
Channel Testing: While some SmartJacks may offer some basic channel testing capabilities, their primary functions are signal conversion and regeneration.
Reference:
SmartJack (Wikipedia): https://en.wikipedia.org/wiki/Smartjack
NEW QUESTION # 58
What does Cisco use for Return Materials Authorization tracking of field-replaceable parts?
- A. product number
- B. serial number
- C. FRU number
- D. RMA number
Answer: D
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 59
The pins on an RJ-45 cable plug are numbered from 1 through 8. When the metal pins of the plug are facing toward you, pin 1 is the leftmost pin. Which two sets of pins are looped on an RJ-45 56K loopback plug? (Choose two.)
- A. pins 2 and 7
- B. pins 1 and 7
- C. pins 1 and 4
- D. pins 2 and 5
- E. pins 2 and 8
Answer: B,E
Explanation:
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.
NEW QUESTION # 60
Which command provides detailed information about the components that are installed on a router, such as the model, PID, and serial number?
- A. show chassis
- B. show router
- C. show inventory
- D. show items
Answer: C
NEW QUESTION # 61
Which two statements about a SmartJack are true? (Choose two.)
- A. It provides channel testing.
- B. It provides signal conversion.
- C. It operates at Layer 2 of the OSI model.
- D. It acts as a concentration point for dial-in and dial-out connections.
- E. It regenerates the signal to compensate for signal degradation from line transmission.
Answer: B,E
NEW QUESTION # 62
Which two commands are valid for copying a saved configuration to RAM? (Choose two.)
- A. copy tftp startup-config
- B. copy startup-config running-config
- C. copy tftp running-config
- D. copy running-config tftp
- E. copy running-config startup-config
Answer: B,C
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 63
Which type of memory stores the configuration of a router or switch by default?
- A. flash
- B. ROM
- C. RAM
- D. NVRAM
Answer: D
Explanation:
NVRAM (Non-Volatile Random Access Memory) is the default storage location for the startup configuration file of a Cisco router or switch.expand_more Here's why:
Non-Volatility: NVRAM retains its contents even when the device loses power.expand_more This is essential for storing the startup configuration, which contains critical settings like interface configurations, routing protocols, and passwords.
Read/Write Capability: Unlike ROM, NVRAM allows you to both read and write data. This makes it possible to modify the configuration and save the changes into NVRAM as the startup configuration.
Other Memory Types and Their Functions:
RAM (Random Access Memory): RAM is volatile memory, meaning it loses its contents when the device is powered off.expand_more It's used to store the running configuration (currently active configuration), routing tables, and other temporary data required for the device's operation.
ROM (Read-Only Memory): ROM is non-volatile and stores the bootstrap program used to initiate the boot process of the device.expand_more It's not modifiable by the user.expand_more Flash: Flash memory is also non-volatile.expand_more It's primarily used to store the Cisco IOS image (operating system) and can also store backup configuration files and other data.
NEW QUESTION # 64
Which two commands are valid for copying a saved configuration to RAM? (Choose two.)
- A. copy tftp startup-config
- B. copy startup-config running-config
- C. copy tftp running-config
- D. copy running-config tftp
- E. copy running-config startup-config
Answer: B,C
NEW QUESTION # 65
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