CompTIA N10-008 Online Practice Questions and Exam Preparation

CompTIA N10-008 Online Questions & Answers

• Question 651:

  A network technician is reviewing the interface counters on a router interface. The technician is attempting to confirm a cable issue. Given the following information:

  

  Which of the following metrics confirms there is a cabling issue?

  A. Last cleared
  B. Number of packets output
  C. CRCs
  D. Giants
  E. Multicasts
  C. CRCs

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  Explanation/Reference:

  The metric that confirms a cabling issue is the CRCS (Cyclic Redundancy Check Errors) value. This value indicates the number of packets that failed the CRC check, which is a mathematical algorithm used to detect errors in the data transmitted over the cable. A high number of CRCS errors indicates that there may be a problem with the cabling, such as a loose or damaged cable. In this case, the router interface has recorded 183 CRCS errors, which suggests that there may be a cabling issue that needs to be investigated.

• Question 652:

  To find the best subnet mask that meets the requirement of six usable IP addresses, we need to calculate the number of host bits and the number of host addresses for each option. The number of host bits is the number of 0s in the binary representation of the subnet mask, and the number of host addresses is 2^host bits - 2 (the -2 is to exclude the network address and the broadcast address). The option that has the smallest number of host addresses that is greater than or equal to six is the best choice. Here are the calculations for each option:

  A. 255.255.255.128 Binary: 11111111.11111111.11111111.10000000 Host bits: 7 Host addresses: 2^7 - 2 = 126 - 2 = 124 This option has too many host addresses for the requirement.
  B. 255.255.255.192 Binary: 11111111.11111111.11111111.11000000 Host bits: 6 Host addresses: 2^6 - 2 = 64 - 2 = 62 This option also has too many host addresses for the requirement.
  C. 255.255.255.224 Binary: 11111111.11111111.11111111.11100000 Host bits: 5 Host addresses: 2^5 - 2 = 32 - 2 = 30 This option has the smallest number of host addresses that is greater than or equal to six, so this is the best choice.
  D. 255.255.255.240 Binary: 11111111.11111111.11111111.11110000 Host bits: 4 Host addresses: 2^4 - 2 = 16 - 2 = 14 This option has fewer host addresses than the requirement, so this is not a valid choice.
  C. 255.255.255.224 Binary: 11111111.11111111.11111111.11100000 Host bits: 5 Host addresses: 2^5 - 2 = 32 - 2 = 30 This option has the smallest number of host addresses that is greater than or equal to six, so this is the best choice.

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  Explanation/Reference:

  This subnet mask will allow you to have six usable IP addresses in each subnet, with a minimum of wasted addresses. You can use the following formula to calculate the number of subnets and the subnet ID for each subnet:

  Number of subnets = 2^network bits Subnet ID = (subnet number - 1) x number of host addresses + network address

  The network bits are the number of 1s in the binary representation of the subnet mask, and the network address is the first address in the range. For example, if your range is 192.168.1.0/27, then the network bits are 27, the network address

  is 192.168.1.0, and the number of host addresses is 30. Therefore, the number of subnets is 2^27, and the subnet ID for the first subnet is (1 - 1) x 30 + 192.168.1.0 = 192.168.1.0. The subnet ID for the second subnet is (2 - 1) x 30 +

  192.168.1.0 = 192.168.1.32, and so on.

• Question 653:

  A network engineer is designing a wireless network that has the following requirements:

  1.

  Network speed must be higher than 100Mbps

  2.

  Must use the 2.4GHz and 5GHz bands

  Which of the following 802.11 standards should the engineer select?

  A. 802.11a
  B. 802.11b
  C. 802.11g
  D. 802.11n
  D. 802.11n

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  Explanation/Reference:

  802.11n is a wireless standard that supports up to 600 Mbps data rate and operates in both the 2.4 GHz and 5 GHz frequency bands. 802.11n uses multiple-input multiple-output (MIMO) technology to increase the number of spatial streams and improve the wireless performance and range. 802.11n meets the requirements of the wireless network design. References: Network+ Study Guide Objective 1.6: Explain the functions of network services.

• Question 654:

  A device is connected to a managed Layer 3 network switch. The MAC address of the device is known, but the static IP address assigned to the device is not. Which of the following features of a Layer 3 network switch should be used to determine the IPv4 address of the device?

  A. MAC table
  B. Neighbor Discovery Protocol
  C. ARP table
  D. IPConfig
  E. ACL table
  C. ARP table

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  Explanation/Reference:

  The ARP table is a database that is used by a device to map MAC addresses to their corresponding IP addresses. When a device sends a packet to another device on the same network, it uses the MAC address of the destination device to deliver the packet. The ARP table allows the device to determine the IP address of the destination device based on its MAC address.

• Question 655:

  A local company is planning to upgrade its current wireless network solution to achieve better performance and improve employees' experience. The solution will require a 5GHz radio band to support all current company devices. Which of the following should be considered as an option for the upgrade?

  A. 802.11
  B. 802.11b
  C. 802.11n
  D. 802.11g
  C. 802.11n

• Question 656:

  A network administrator is troubleshooting a PC that cannot connect to the LAN. The administrator runs the ipconfig command at the command prompt and gets the following output:

  

  Which of the following is misconfigured?

  A. Subnet mask
  B. Physical address
  C. DNS server
  D. DHCP server
  A. Subnet mask

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  Explanation/Reference:

  The subnet mask should be in the standard format, such as 255.255.255.0, which is a typical subnet mask for a Class C network. The value provided (225.225.225.224) is not a valid subnet mask and should be corrected to match the appropriate subnet for the network, often 255.255.255.0 for a typical home or small office network.

• Question 657:

  A user cannot connect to the network, although others in the office are unaffected. The network technician sees that the link lights on the NIC are not on. The technician needs to check which switchport the user is connected to, but the cabling is not labeled. Which of the following is the best way for the technician to find where the computer is connected?

  A. Look up the computer's IP address in the switch ARP table.
  B. Use a cable tester to trace the cable.
  C. Look up the computer's MAC address in the switch CAM table.
  D. Use a tone generator to trace the cable.
  D. Use a tone generator to trace the cable.

• Question 658:

  A network engineer is planning to connect a legacy network switch to a core switch for redundancy. The proposed cable will run in the celling above high-voltage industrial equipment and fluorescent lights. The legacy switch has 1000BASE-T ports with no expansion slots. The engineer has decided to use multimode cable to make this connection. Which of the following will be needed to connect the two switches?

  A. RG-6 connectors
  B. A patch panel
  C. A GBIC transceiver
  D. A media converter
  D. A media converter

• Question 659:

  Which of the following is an invalid MAC address?

  A. AA:CE:58:FD:90:08
  B. 44:98:3E:F8:33:23
  C. 56:AD:BX:89:55:54
  D. 94:9E:FE:EE:8C:DF
  C. 56:AD:BX:89:55:54

• Question 660:

  SIMULATION

  Users are unable to access files on their department share located on file server 2. The network administrator has been tasked with validating routing between networks hosting workstation A and file server 2. INSTRUCTIONS

  Click on each router to review output, identify any issues, and configure the appropriate solution.

  If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

  

  

  

  A. See the answer and solution below.
  B. PlaceHolder
  C. PlaceHolder
  D. PlaceHolder
  A. See the answer and solution below.

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