Practice Free 100-490 Exam Online Questions
Question #21
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 2 and 8
- C . pins 2 and 5
- D . pins 1 and 7
- E . pins 1 and 4
Correct Answer: BD
BD
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.
BD
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.
Question #22
Which two pairs of LAN Ethernet devices use an RJ-45 straight-through cable? (Choose two.)
- A . switch-to-switch
- B . switch-to-router
- C . switch-to-hub
- D . router-to-router
- E . switch-to-server
Correct Answer: BE
BE
Explanation:
Questions no: 12 Verified Answer
B. switch-to-router, E. switch-to-server 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
BE
Explanation:
Questions no: 12 Verified Answer
B. switch-to-router, E. switch-to-server 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 #23
Which command initiates the transfer of a Cisco IOS image over IP from ROMMON?
- A . Xmodem
- B . copy tftp: flash:
- C . copy flash: tftp:
- D . tftpdnld
Correct Answer: D
D
Explanation:
The tftpdnld command is specifically designed to initiate a TFTP (Trivial File Transfer Protocol) transfer of an image within ROMmon mode on a Cisco device. Here’s why it’s the correct answer: ROMmon Functionality: ROMmon (Read-Only Memory Monitor) is a basic operating system mode used when the main Cisco IOS is unavailable. The tftpdnld command works from ROMmon to download a new IOS image.
TFTP Protocol: The tftpdnld command utilizes TFTP, which is a simple and reliable protocol commonly used for transferring Cisco IOS images.
Purpose: The command is used primarily for recovering corrupt images or upgrading to a different IOS version.
Why other options are incorrect:
Xmodem: XMODEM is an older and less reliable file transfer protocol that’s less suitable than TFTP for Cisco IOS image transfers.
copy tftp: flash: This command format is used within the Cisco IOS itself, not in ROMmon mode. copy flash: tftp: This command format would attempt to upload an image from flash memory to a TFTP server, instead of downloading an image.
D
Explanation:
The tftpdnld command is specifically designed to initiate a TFTP (Trivial File Transfer Protocol) transfer of an image within ROMmon mode on a Cisco device. Here’s why it’s the correct answer: ROMmon Functionality: ROMmon (Read-Only Memory Monitor) is a basic operating system mode used when the main Cisco IOS is unavailable. The tftpdnld command works from ROMmon to download a new IOS image.
TFTP Protocol: The tftpdnld command utilizes TFTP, which is a simple and reliable protocol commonly used for transferring Cisco IOS images.
Purpose: The command is used primarily for recovering corrupt images or upgrading to a different IOS version.
Why other options are incorrect:
Xmodem: XMODEM is an older and less reliable file transfer protocol that’s less suitable than TFTP for Cisco IOS image transfers.
copy tftp: flash: This command format is used within the Cisco IOS itself, not in ROMmon mode. copy flash: tftp: This command format would attempt to upload an image from flash memory to a TFTP server, instead of downloading an image.
Question #24
Which two IPv4 addresses can be assigned to a host computer? (Choose two.)
- A . 255.255.255.255
- B . 10.1.1.20
- C . 0.0.0.0
- D . 192.168.10.15
- E . 292.10.3.4
Correct Answer: BD
BD
Explanation:
IPv4 addresses consist of four octets, each ranging from 0 to 255. The addresses are used to uniquely identify devices on a network.
BD
Explanation:
IPv4 addresses consist of four octets, each ranging from 0 to 255. The addresses are used to uniquely identify devices on a network.
Question #24
Which two IPv4 addresses can be assigned to a host computer? (Choose two.)
- A . 255.255.255.255
- B . 10.1.1.20
- C . 0.0.0.0
- D . 192.168.10.15
- E . 292.10.3.4
Correct Answer: BD
BD
Explanation:
IPv4 addresses consist of four octets, each ranging from 0 to 255. The addresses are used to uniquely identify devices on a network.
BD
Explanation:
IPv4 addresses consist of four octets, each ranging from 0 to 255. The addresses are used to uniquely identify devices on a network.