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Cisco 100-490 exam covers a range of topics, including network fundamentals, LAN switching technologies, routing technologies, WAN technologies, infrastructure services, and infrastructure maintenance. Candidates will need to demonstrate their understanding of fundamental network concepts such as network topology, protocols, and addressing schemes. They will also need to show their ability to configure and troubleshoot various Cisco routing protocols, including OSPF, EIGRP, and BGP. Additionally, candidates will need to demonstrate their knowledge of VLANs, VLAN trunking protocols, and Spanning Tree Protocol (STP).
NEW QUESTION # 34
Which layer of the OSI model defines how data is formatted for transmission and how access to the physical media is controlled?
- A. transport
- B. network
- C. data link
- D. presentation
Answer: C
Explanation:
Reference:
https://itcertzone.wordpress.com/2011/01/24/the-seven-layers-of-the-osi-model/#:~:text=Layer% 202%3A%20The%20Data%20Link,reliable%20delivery%20of%20the%20data.
NEW QUESTION # 35
What is the primary method for recovering or upgrading a Cisco network device system image?
- A. the xmodem command
- B. the tftpdnld command
- C. FTP
- D. USB storage
Answer: B
Explanation:
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.
NEW QUESTION # 36
Which type of memory stores the configuration of a router or switch by default?
- A. RAM
- B. ROM
- C. flash
- 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 # 37
Which command returns the user to the main configuration prompt from the interface configuration prompt?
- A. quit
- B. exit
- C. clear
- D. end
Answer: B
Explanation:
The command that returns the user to the main configuration prompt from the interface configuration prompt is exit. When you are in interface configuration mode on a Cisco device and you want to return to the global configuration mode, you use the exit command. If you want to go all the way back to privileged EXEC mode, you would use the end command or press Ctrl-Z1.
NEW QUESTION # 38
Which type of port on a laptop is used to connect to an Ethernet port on a Cisco switch?
- A. RJ-45
- B. DB-9
- C. RJ-11
- D. DVI
Answer: A
NEW QUESTION # 39
Which set of steps best describes how to assign a static IP address to the Ethernet port on a computer?
- A. From the Network and Sharing Center, click Internet Protocol (TCP/IP), and follow the New Connection Wizard instructions.
- B. From the Network and Sharing Center, double-click Local Area Connection. Select Properties > iPass Protocol (IEEE 802.1x) > Properties > Static IP.
- C. From the Network and Sharing Center, click Change adapter, then double-click a local area connection. Select Internet Protocol (TCP/IP) > Properties > Use the Following Address, and then configure the IP information.
- D. Click Start. Enter cmd and click OK. Enter the IP address XXX.XXX.XXX.XXX.
Answer: C
NEW QUESTION # 40
Which command initiates the transfer of a Cisco IOS image over IP from ROMMON?
- A. copy flash: tftp:
- B. tftpdnld
- C. copy tftp: flash:
- D. Xmodem
Answer: B
NEW QUESTION # 41
Which two statements about a SmartJack are true? (Choose two.)
- A. It regenerates the signal to compensate for signal degradation from line transmission.
- B. It operates at Layer 2 of the OSI model.
- C. It provides signal conversion.
- D. It provides channel testing.
- E. It acts as a concentration point for dial-in and dial-out connections.
Answer: A,C
NEW QUESTION # 42
What is the correct IPv6 address notation?
- A. 2001:0DB8::1:1:1:1:1
- B. 2001:0DB8:0::
- C. 2001:0DB8::/128
- D. 2001:0DB8:130F:0000:0000:7000:0000:140B
Answer: D
Explanation:
Section: General Networking Knowledge
NEW QUESTION # 43
Which type of physical connector does a Gigabit Ethernet port typically use?
- A. DB-25
- B. RJ-9
- C. RJ-45
- D. RJ-11
Answer: C
NEW QUESTION # 44
Which command displays a list of file systems that are available on Cisco devices?
- A. show file system
- B. show version
- C. show directory
- D. show memory
Answer: A
NEW QUESTION # 45
What does Cisco use for Return Materials Authorization tracking of field-replaceable parts?
- A. product number
- B. FRU number
- C. RMA number
- D. serial number
Answer: C
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 46
Refer to the exhibit. What are two identifications for the hardware components? (Choose two.)
- A. 2 is a USB 5-pin mini USB Type B to USB Type A console cable.
- B. 2 is an RJ-45 to USB Type A console cable.
- C. 3 is a USB 5-pin mini USB Type B port.
- D. 1 is a USB Type A port.
- E. 3 is a USB Type A port.
Answer: B,D
Explanation:
* The label "1" points to a rectangular port on the laptop. This is consistent with the shape of a USB Type A port.
* The cable labeled "2" has an RJ-45 connector on one end and a USB Type A connector on the other end.
Incorrect Answers:
* C. 2 is a USB 5-pin mini USB Type B to USB Type A console cable: The connector on the cable labeled "2" is not a mini USB Type B connector. It is a standard RJ-45 connector.
* D. 3 is a USB Type A port: The label "3" points to a port on the server that is not visible in the image. Therefore, we cannot identify the type of port it is.
* E. 3 is a USB 5-pin mini USB Type B port: Same as D, we cannot identify the type of port labeled "3" due to lack of visibility in the image.
NEW QUESTION # 47
Which Cisco CPAK 100GBASE module supports Multimode Fiber cable?
- A. Cisco CPAK-100G-SR4
- B. Cisco CPAK-100G-CWDM4
- C. Cisco CPAK-100G-ER4L
- D. Cisco CPAK-100G-LR4
Answer: A
Explanation:
Reference:
https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/ data_sheet_c78-728110.html
NEW QUESTION # 48
What is the primary method for recovering or upgrading a Cisco network device system image?
- A. the xmodem command
- B. the tftpdnld command
- C. FTP
- D. USB storage
Answer: B
NEW QUESTION # 49
Which two Cisco Nexus 3400 Series switches support 400-Gbps Ethernet ports? (Choose two.)
- A. Cisco Nexus 3408-S
- B. Cisco Nexus 34180YC
- C. Cisco Nexus 3432D-S
- D. Cisco Nexus 34200YC-SM
- E. Cisco Nexus 3464C
Answer: A,C
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 # 50
Which Xmodem option is used to enhance error checking of an image that is copied to flash memory?
- A. -r
- B. -e
- C. -x
- D. -c
Answer: D
Explanation:
The -c option in Xmodem file transfers is used to enable CRC (Cyclic Redundancy Check) for enhanced error checking. Here's why it's the correct answer:
Error Detection: CRC is a more robust error detection mechanism compared to the standard checksum method used in Xmodem. It provides greater reliability in identifying file corruption during the transfer.
Flash Memory: Since flash memory on a Cisco router or switch stores critical data like configuration files or the IOS image, ensuring the integrity of transferred files is crucial.
Why other options are incorrect:
-e, -r, -x: These are not standard Xmodem options for error checking purposes. While some implementations may have custom flags, they are not universally applicable.
Important Note: Xmodem is a legacy protocol that is often replaced by more reliable options like TFTP in modern Cisco devices. However, understanding Xmodem options is still relevant for certain cases or older equipment.
Reference:
Xmodem overview: https://en.wikipedia.org/wiki/XMODEM
Cyclic Redundancy Check (CRC): https://en.wikipedia.org/wiki/Cyclic_redundancy_check
NEW QUESTION # 51
Which two features are associated with single-mode fiber-optic cable? (Choose two.)
- A. costs less than multimode fiber
- B. consists of a single strand of glass fiber
- C. has higher attenuation that multimode fiber
- D. operates over less distance than multimode fiber
- E. carries a higher bandwidth that multimode fiber
Answer: B,E
Explanation:
Section: Cisco Equipment and Related Hardware
NEW QUESTION # 52
Which command initiates the copying of a Cisco IOS image to a Cisco device?
- A. copy xmodem flash
- B. copy tftp flash
- C. copy flash tftp
- D. copy tftp nvram
Answer: B
Explanation:
Section: Service-related Knowledge
Explanation
NEW QUESTION # 53
Which two features are associated with single-mode fiber-optic cable? (Choose two.)
- A. costs less than multimode fiber
- B. consists of a single strand of glass fiber
- C. has higher attenuation that multimode fiber
- D. operates over less distance than multimode fiber
- E. carries a higher bandwidth that multimode fiber
Answer: B,E
NEW QUESTION # 54
What is the correct IPv6 address notation?
- A. 2001:0DB8::1:1:1:1:1
- B. 2001:0DB8:0::
- C. 2001:0DB8::/128
- D. 2001:0DB8:130F:0000:0000:7000:0000:140B
Answer: D
NEW QUESTION # 55
What are two purposes of a USB thumb drive? (Choose two.)
- A. to copy configuration files to and from a PC
- B. to save the system log
- C. to copy IOS images to and from a PC
- D. to increase system memory size
- E. to save router hardware information
Answer: A,C
Explanation:
USB thumb drives (also called flash drives) serve several practical purposes in networking:
File Transfer: They are excellent for transferring Cisco router or switch configuration files between the device and a PC. This allows you to back up configurations, easily restore configurations, or work with them offline.
IOS Image Storage: USB thumb drives are convenient for storing and transferring Cisco IOS images, especially when you need to upgrade or recover network devices.
Why other options are incorrect:
to save the system log: While you might temporarily store log files on a USB drive, routers and switches generally utilize internal memory or a remote syslog server for logging purposes.
to save router hardware information: Hardware inventory information obtained from commands like show inventory is often copied and pasted to text files, which can then be stored on a USB drive. However, the drive itself doesn't directly save or store this hardware information.
to increase system memory: USB drives are not designed to act as additional system memory (RAM) for a router or switch.
NEW QUESTION # 56
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