[Nov 29, 2024] Free CCT Routing and Switching 100-490 Official Cert Guide PDF Download
Cisco 100-490 Official Cert Guide PDF
NEW QUESTION # 39
What are two components of a WAN connection? (Choose two.)
- A. bridge
- B. CSU/DSU
- C. hub
- D. router
- E. switch
Answer: B,D
NEW QUESTION # 40
What is the primary method for recovering or upgrading a Cisco network device system image?
- A. the tftpdnld command
- B. USB storage
- C. the xmodem command
- D. FTP
Answer: A
NEW QUESTION # 41
Which type of memory is erased on a Cisco device when rebooted?
- A. DRAM
- B. flash
- C. PVDM
- D. NVRAM
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
NEW QUESTION # 42
Which two features are associated with single-mode fiber-optic cable? (Choose two.)
- A. consists of a single strand of glass fiber
- B. carries a higher bandwidth that multimode fiber
- C. costs less than multimode fiber
- D. has higher attenuation that multimode fiber
- E. operates over less distance than multimode fiber
Answer: A,B
NEW QUESTION # 43
What is the line speed of a DS0 in North America?
- A. 16 kbps
- B. 64 kbps
- C. 128 kbps
- D. 32 kbps
Answer: B
Explanation:
Section: Cisco Equipment and Related Hardware
NEW QUESTION # 44
Which type of memory stores the decompressed form of Cisco IOS Software and the running configuration?
- A. DRAM
- B. flash
- C. ROM
- D. NVRAM
Answer: A
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
NEW QUESTION # 45
Which command displays the configuration register setting?
- A. show config-register
- B. show flash
- C. show version
- D. show running-config
Answer: C
NEW QUESTION # 46
Which two statements about a SmartJack are true? (Choose two.)
- A. It provides signal conversion.
- B. It provides channel testing.
- C. It regenerates the signal to compensate for signal degradation from line transmission.
- D. It operates at Layer 2 of the OSI model.
- E. It acts as a concentration point for dial-in and dial-out connections.
Answer: A,C
Explanation:
Section: Cisco Equipment and Related Hardware
NEW QUESTION # 47
Which two pieces of information about a neighboring device are displayed when you use the CLI command show cdp neighbor? (Choose two.)
- A. platform
- B. device ID
- C. Cisco IOS Software version
- D. IP address
- E. uptime
Answer: A,B
Explanation:
Section: Cisco IOS Software Operation
NEW QUESTION # 48
From the enable mode, which command loads the configuration during the password recovery process on a Cisco router?
- A. configure terminal
- B. copy running-config startup-config
- C. load_helper
- D. copy startup-config running-config
Answer: D
Explanation:
Section: Service-related Knowledge
NEW QUESTION # 49
Which command displays information about the carrier network, cell site, and available service?
- A. show cellular unit hardware
- B. show cellular unit radio
- C. show cellular unit profile
- D. show cellular unit network
Answer: D
Explanation:
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.
Reference:
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
NEW QUESTION # 50
What is the line speed of a DS0 in North America?
- A. 16 kbps
- B. 64 kbps
- C. 128 kbps
- D. 32 kbps
Answer: B
Explanation:
The line speed of a DS0 in North America is:
C . 64 kbps
DS0, or Digital Signal 0, is a digital signaling standard in telecommunications characterized by its transmission rate of 64 Kbps. It is the basic unit of data in digital networks and is used to transmit a single voice channel or data
NEW QUESTION # 51
An Ethernet interface is up and the line protocol is down. What are two possible causes? (Choose two.)
- A. The Ethernet interface has been manually disabled.
- B. Keepalives are not being received by the local device.
- C. The Ethernet cable might not be attached properly.
- D. There is a Layer 2 mismatch in the encapsulation type.
- E. There is a speed or duplex mismatch with the remote device.
Answer: D,E
NEW QUESTION # 52
Which two commands identify the serial number of a Cisco router? (Choose two.)
- A. show inventory
- B. show environment
- C. show run
- D. show version
- E. show archive
Answer: A,D
Explanation:
The commands that can be used to identify the serial number of a Cisco router are show inventory and show version. The show inventory command provides detailed information about the hardware inventory, including the serial numbers of the device and its components1. The show version command displays the router's configuration, including the version of the operating system, the last reboot reason, and the hardware serial number, which is listed as the "Processor board ID" in the command output2. These commands are essential for network administrators to document and manage network equipment.
NEW QUESTION # 53
Which layer of the OSI model defines how data is formatted for transmission and how access to the physical media is controlled?
- A. network
- B. data link
- C. transport
- D. presentation
Answer: B
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 # 54
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Prerequisites
The target audience for the 100-490 RSTECH exam and its Cisco Certified Technician Routing & Switching certification is those onsite support technicians who are seeking to gain technical competence in diagnosing, restoring, repairing, as well as replacing the major Cisco routing and switching network devices. There are no official prerequisites for taking this qualifying test, but before attempting it, the applicants should develop a solid understanding of the topics included in the exam syllabus.
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