Question 1

Which two pairs of LAN Ethernet devices use an RJ-45 straight-through cable? (Choose two.)

Accepted Answer

Explanation: Questions no : 12 Verified Answer: = B. switch-to-router, E. switch-to-server Explanation:Comprehensive and Detailed Step by Step Explanation: = RJ-45 straight-through cables are used to connect different types of devices in a network. The standard practice is to use straight- through cables for connections that are unlike to each other, such as: Switch-to-Router: A switch connects devices within a network by using MAC addresses to forward data to the correct destination. A router, on the other hand, connects multiple networks and uses IP addresses to determine the best path for the data packets. Connecting a switch to a router requires a straight-through cable because they are different types of devices12. Switch-to-Server: Servers are the powerful computers that provide resources, data, services, or programs to the client machines in the network. When connecting a switch to a server, a straight- through cable is used because the switch and the server are different types of devices with different functions within the network12. Reference := Guru99, TheTechMentor

Question 2

Which type of memory stores the decompressed form of Cisco IOS Software and the running configuration?

Accepted Answer

D

Explanation: The decompressed form of Cisco IOS Software and the running configuration are stored in DRAM (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

Question 3

Which two sets of pins are looped on an RJ-45 56K loopback plug? (Choose two.)

Accepted Answer

AC

Explanation: 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. Reference := Loopback Tests for T1/56K Lines - Cisco

Question 4

Which type of memory is erased on a Cisco device when rebooted?

Accepted Answer

A

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

Question 5

What are two purposes of a USB thumb drive? (Choose two.)

Accepted Answer

BD

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.

Question 6

Which type of port is used to connect a laptop to an Ethernet port on a Cisco router?

Accepted Answer

C

Explanation: Straight-through cables are the most common type of Ethernet cable. They're used to connect dissimilar devices, such as a laptop to a router or a switch to a router. The internal wiring of the cable connects the transmit pins on one end to the receive pins on the other end, and vice versa. Crossover cables were historically necessary to connect similar devices (e.g., router to router, or switch to switch). Modern devices often have auto MDI-X capabilities, allowing them to automatically detect and adjust to straight-through or crossover connections as needed. Rollover cables have a reversed pinout and are primarily used for console access into Cisco routers and switches. Fiber cables use fiber optic technology for high-speed, long-distance connectivity. Reference: Cisco Networking Academy: Introduction to Networks Course

Question 7

Which two Cisco Nexus 3400 Series switches support 400-Gbps Ethernet ports? (Choose two.)

Accepted Answer

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. Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3400s/sw/922/interfaces/ configuration/guide/b_Cisco_Nexus_3400_NX-OS_Interfaces_Configuration_Guide_922/ b_Cisco_Nexus_3400_NX-OS_Interfaces_Configuration_Guide_9z_chapter_010.html

Question 8

Which layer of the OSI model defines how data is formatted for transmission and how access to the physical media is controlled?

Accepted Answer

B

Explanation: The data link layer of the OSI model, which is Layer 2, defines how data is formatted for transmission and controls access to the physical media. This layer is responsible for the node-to-node delivery of data and handles error detection and correction from the physical layer. It also manages the way data packets are sent over the network, including the framing, addressing, and flow control. The data link layer ensures that messages are delivered to the proper device on a LAN using hardware addresses (MAC addresses) and translates messages from the network layer into bits for the physical layer to transmit Reference: https://itcertzone.wordpress.com/2011/01/24/the-seven-layers-of-the-osimodel/#:~:text=Layer% 202%3A%20The%20Data%20Link,reliable%20delivery%20of%20the%20data.

Question 9

Which two commands are valid for copying a saved configuration to RAM? (Choose two.)

Accepted Answer

AC

Explanation: 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-config copies the current running configuration to the startup configuration, which is the opposite of what’s asked. copy running-config tftp is used to save the running configuration to a TFTP server, not to copy to RAM. copy tftp startup-config would copy a file from a TFTP server to the startup configuration, not to the running configuration in RAM. Reference := Solved: Copy config to new router - Cisco Community

Question 10

Which type of physical connector does a Gigabit Ethernet port typically use?

Accepted Answer

B

Explanation: https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/100-490/page_8_img_1.jpg The typical physical connector used for a Gigabit Ethernet port is an RJ-45. This connector is standard for network cabling and provides the necessary performance for Gigabit Ethernet, which is also known as 1000BASE-T. RJ-45 connectors are used because they can support higher data rates compared to other connectors like RJ-11 or RJ-9, which are commonly used for telephone connections, and DB-25, which is an older serial port connector not suitable for high-speed Ethernet connections1. Reference := 2: Ethernet Alliance - The Physical Layer of Ethernet 3: Altium - Gigabit Ethernet 101: Basics to Implementation 1: Ascent Optics - All You Need to Know About RJ45 Cables: Connectors, Interfaces, and… 4: Hardware Secrets - Gigabit Ethernet and How it works (a 2022 Guide)

Question 11

What are two functions of SmartJack? (Choose two.)

Accepted Answer

Explanation: 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. Reference := Network interface device - Wikipedia, Demarcation Point: Everything You Need To Know

Question 12

Which command provides detailed information about the components that are installed on a router, such as the model, PID, and serial number?

Accepted Answer

C

Explanation: 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.

Question 13

Which type of memory stores the configuration of a router or switch by default?

Accepted Answer

C

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.

Question 14

Which bits represent the boot field in the configuration register value?

Accepted Answer

D

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-switchingicnd1-100-105/configuration-register-cisco-ios

Question 15

What does Cisco use for Return Materials Authorization tracking of field-replaceable parts?

Accepted Answer

C

Explanation: RMA (Return Materials Authorization) is a tracking number that is assigned to a product that is being returned to the manufacturer for repair or replacement. The RMA number allows the manufacturer to track the progress of the return and ensure that the product is returned to the correct customer. Reference: Cisco Technical Services Supply Chain FAQs

Free Cisco 100-490 Actual Exam Questions