CompTIA CompTIA Network+ N10-008 Questions & Answers

• Question 1:

  At which of the following layers of the OSI model can switches operate? (Select two).

  A. Layer 1

  B. Layer 2

  C. Layer 3

  D. Layer 4

  E. Layer 5

  F. Layer 6

  Correct Answer: BC

  Switches operate at Layer 2 and Layer 3 of the OSI model. Here's a brief explanation for each layer:

  Layer 2 (Data Link Layer):

  Layer 3 (Network Layer):

• Question 2:

  Which of the following fields are negotiated during the three-way-handshake process? (Select three).

  A. Sequence number

  B. MTU

  C. Window size

  D. MSS

  E. TTL

  F. Flags

  G. Acknowledgment number

  H. CRC

  Correct Answer: ACG

  During the TCP three-way handshake process, the following fields are negotiated:

  A. Sequence number: Initial sequence numbers are established during the handshake to keep track of the segments in the communication. C. Window size: This determines the amount of data that can be sent before receiving an acknowledgment.

  G. Acknowledgment number: This confirms receipt of the data and also indicates the next expected byte. The other options are not negotiated during the three-way handshake:

  B. MTU (Maximum Transmission Unit): This is determined at the network layer and is not negotiated during the handshake.

  D. MSS (Maximum Segment Size): This is communicated during the handshake but not negotiated; it's declared by the sender to inform the receiver of the maximum segment size it can handle.

  E. TTL (Time To Live): This is set in each IP packet to limit its lifespan and is not negotiated during the handshake.

  F. Flags: Specific flags are used during the handshake (SYN and ACK), but they are not "negotiated" per se.

  H. CRC (Cyclic Redundancy Check): This is used for error-checking in frames at the data link layer and is not part of the three-way handshake.

• Question 3:

  A network administrator is adding a new wired IoT device to the internal network. The only devices that will be communicating are the HVAC system and the IoT device.

  Which of the following should the network administrator do?

  A. Set up a secure VM.

  B. Implement a reverse proxy.

  C. Set up the guest network isolation.

  D. Configure a dedicated VLAN.

  Correct Answer: D

  When adding a new wired IoT device that will only communicate with the HVAC system, it is best practice to configure a dedicated VLAN. This isolates the traffic between the IoT device and the HVAC system from the rest of the network,

  enhancing security and network efficiency.

  References:

  CompTIA Network+ N10-008 Full Course for Beginners - Configuring SOHO Networks4

  Network+ (Plus) Certification | CompTIA IT Certifications

• Question 4:

  A network engineer is installing APs for a SOHO where every staff member uses a cordless phone. Which of the following standards would work best to reduce interference?

  A. 802.11a

  B. 802.11b

  C. 802.11g

  D. 802.1X

  Correct Answer: A

• Question 5:

  Users are connected to a switch on an Ethernet interface of a campus router. The service provider is connected to the serial 1 interface on the router. The output of the interfaces is: E1/0: 192.168.8.1/24 S1: 192.168.7.252/30

  After router and device configurations are applied, internet access is not possible. Which of the following is the most likely cause?

  A. The Ethernet interface was configured with an incorrect IP address.

  B. The router was configured with an incorrect loopback address.

  C. The router was configured with an incorrect default gateway.

  D. The serial interface was configured with the incorrect subnet mask.

  Correct Answer: D

• Question 6:

  A network technician is working to deploy a new subnet to support 500 hosts. The technician needs to limit the number of unused IP addresses. Which of the following subnets should the technician choose?

  A. 255.255.224.0

  B. 255.255.248.0

  C. 255.255.252.0

  D. 255.255.254.0

  Correct Answer: D

• Question 7:

  A branch office is experiencing frequent power-related issues that are taking the network down dally. Which of the following would best address this network uptime issue?

  A. MPLS

  B. IPS

  C. PDU

  D. UPS

  E. HA firewalls

  Correct Answer: D

• Question 8:

  A user is experiencing network connectivity issues. Upon investigation, the engineer learns that the user installed a personal router and switch to use for multiple computers in the department. Which of the following has the user most likely introduced into the network?

  A. Broadcast storms

  B. Collisions

  C. Rogue DHCP server

  D. DNS poisoning

  Correct Answer: C

• Question 9:

  Which of the following describes the differences between switches and hubs?

  A. Switches operate on the physical layer, while hubs operate on the data link layer.

  B. Switches operate on the session layer, while hubs operate on the transport layer.

  C. Switches operate on the data link layer, while hubs operate on the physical layer.

  D. Switches operate on the transport layer, while hubs operate on the data link layer.

  Correct Answer: C

  Switches operate at the data link layer (Layer 2) of the OSI model and make decisions based on MAC addresses. Hubs, on the other hand, operate at the physical layer (Layer 1) and simply repeat the signals they receive to all connected

  devices without any filtering or decision-making.

  References:

  Networking Devices N10-008 CompTIA Network+ : 2.1

• Question 10:

  A technician troubleshoots user reports about high latency while trying to access some of the web servers. Which of the following would be the best way for the technician to identify the issue?

  A. Use NetFlow on an edge device to view all traffic data.

  B. Use nslookup and dig to Identify issues.

  C. Use ping, nmap, and traceroute.

  D. Use Wireshark and tcpdump on users' devices to log all data.

  Correct Answer: C

  To troubleshoot high latency issues when accessing web servers, a technician should use tools like ping, nmap, and traceroute. Ping can verify the reachability of a server and measure round-trip time. Nmap can scan for open ports and

  detect services running on the server. Traceroute can identify the path traffic takes to reach the server and pinpoint where delays occur.

  References: CompTIA Network+ Certification Exam Objectives1.