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CompTIA Network+ (N10-009) practice questions

218 free questions with answers and explanations.

Practice test
  1. 1.A user reports that their workstation is unable to connect to the network. The technician observes that the link lights on both the workstation's network interface card (NIC) and the switch port are unlit. Which of the following is the MOST appropriate initial step for the technician to take?Network Troubleshooting
  2. 2.A router has two routes to the same destination network: one learned via eBGP from an external autonomous system and one learned via iBGP from a router within the same AS. Both routes have default administrative distances and no other tie-breaking policy has been configured. Which route will the router prefer?Network Implementation
  3. 3.A technician suspects that a workstation's NIC drivers or the local TCP/IP stack may be corrupted after a recent OS update. Before checking cabling or switch port status, the technician wants to confirm that the workstation's network stack itself is functioning. Which command should the technician run first?Network Troubleshooting
  4. 4.A laptop connects to a new wired network and must automatically obtain an IP address configuration. Which sequence of messages correctly represents the DHCP process between the client and server?Networking Concepts
  5. 5.A network administrator needs the ability to access a remote branch switch's console even during a complete outage of the production network, including router and WAN failures. Which solution best provides this capability?Network Operations
  6. 6.A network engineer wants to summarize the following four contiguous /24 networks into a single route advertisement: 192.168.0.0/24, 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24. Which single CIDR block correctly summarizes all four networks?Networking Concepts
  7. 7.A network designer wants every device on a small network to have a direct physical connection to every other device, maximizing redundancy but increasing cabling complexity. Which topology is being described?Networking Concepts
  8. 8.A network architect is segmenting a flat 10.20.0.0/22 network into four equally sized VLANs to isolate departments, with each VLAN needing to be a valid, non-overlapping subnet. What subnet mask should be assigned to each new VLAN?Network Security
  9. 9.A security engineer is configuring 802.1X for a corporate wireless network and wants both the client and the authentication server to mutually verify each other using digital certificates, eliminating the risk of credential theft via a fake authentication portal. Which EAP method should be selected?Network Security
  10. 10.A company wants remote contractors to access only a single internal web-based ticketing application without granting them broader access to the internal network or requiring installation of a full VPN client. Which remote access solution best fits this requirement?Network Operations
  11. 11.A network administrator configures a single trunk link between two switches to carry traffic for multiple VLANs simultaneously. Which standard defines the frame tagging method used to identify VLAN membership on this trunk?Networking Concepts
  12. 12.A security analyst wants to capture only HTTP traffic destined for port 80 on interface eth0 to investigate a possible plaintext credential leak. Which tcpdump command would accomplish this?Network Troubleshooting
  13. 13.A disaster recovery plan specifies an RTO of 2 hours for a critical database server. During an unplanned outage, the IT team restores the server and confirms application functionality 90 minutes after the failure was detected. Which statement best describes this recovery event?Network Operations
  14. 14.A company is installing new network cabling to support 10GBASE-T Ethernet connections up to 100 meters between workstations and a wiring closet switch. Which cable category should be used to meet this requirement?Networking Concepts
  15. 15.Workstations in Building A, which share the same subnet as the DHCP server, receive IP addresses normally. Workstations in Building B, located across a router on a different subnet, fail to receive DHCP-assigned addresses. Static IP addressing works fine in Building B. What is the most likely cause?Network Troubleshooting
  16. 16.A small office wants to connect five workstations so that each device connects to exactly two neighboring devices, forming a closed loop where data travels around the circle. Which topology is being described?Networking Concepts
  17. 17.A company's edge router translates a single internal server's private IP address to one specific public IP address at all times so external clients can consistently reach it. Which technique is being used?Networking Concepts
  18. 18.A monitoring dashboard alerts that a core switch's CPU utilization has risen from a documented normal baseline of 10% to a sustained 85%. The administrator compares the switch's current running configuration against the stored documentation and discovers an unauthorized change to the spanning tree priority. Which network operations practice enabled the administrator to detect this discrepancy?Network Operations
  19. 19.A technician configures a trunk link between two switches. Switch A has VLAN 1 set as the native VLAN, while Switch B has VLAN 99 set as the native VLAN on the same trunk. Which of the following is the MOST likely result of this misconfiguration?Network Implementation
  20. 20.A network administrator wants to protect the spanning tree topology by ensuring that if any BPDU is received on a designated access port connected to end-user devices, the port is immediately disabled rather than allowed to participate in STP calculations. Which feature should be configured on that port?Network Implementation
  21. 21.A network administrator needs to remotely manage a switch's command-line interface over an encrypted connection to prevent credentials from being sent in cleartext. Which port should the administrator use?Networking Concepts
  22. 22.A technician uses a cable certifier to test a newly terminated Cat 6 patch cable. The tester reports that pins 1-2 and 3-6 are reversed at one end compared to the other. Which term best describes this wiring fault?Network Troubleshooting
  23. 23.A technician is installing a PTZ security camera that requires 25.5W of power delivered over Ethernet at the powered device. Which PoE standard must the switch support to meet this requirement?Network Implementation
  24. 24.A network engineer is designing an SDN deployment and needs the controller to install forwarding rules directly onto physical switches using a standardized communication protocol. Which type of interface accomplishes this?Networking Concepts
  25. 25.Before implementing a new firewall rule in production, a technician must submit a formal request describing the business justification, expected impact, testing plan, and rollback procedure, and obtain approval from a review board. What process is being followed?Network Operations
  26. 26.A technician cannot resolve hostnames to IP addresses from a client workstation, though the workstation can ping IP addresses directly. Which port should the technician verify is open on the firewall between the client and the DNS server?Networking Concepts
  27. 27.A technician needs to identify which hosts on a /24 subnet have port 3389 (RDP) open before applying a security patch. Which nmap command would BEST accomplish this?Network Troubleshooting
  28. 28.A network engineer configures an internal NTP server that receives its time directly from a GPS receiver connected via a serial cable. This internal server then distributes time to all other devices on the corporate network. What stratum level is this internal NTP server?Network Operations
  29. 29.Three OSPF routers are connected to the same Ethernet multiaccess segment. Which mechanism does OSPF use on this segment to reduce the number of adjacencies formed and minimize routing update traffic?Network Implementation
  30. 30.A technician needs to verify that a domain's mail exchange (MX) records are correctly configured and also wants to see the authoritative name server response directly, bypassing local resolver cache. Which tool is BEST suited for this task?Network Troubleshooting
  31. 31.An edge router receives the same route to 203.0.113.0/24 from two BGP neighbors. All BGP path attributes are equal except the AS_PATH attribute: one route has AS_PATH '65010 65020 65030' and the other has AS_PATH '65010 65040'. Assuming no other tie-breakers apply first, which route will BGP select as the best path?Network Implementation
  32. 32.A technician is terminating multiple Cat 6 cables from a wiring closet into a 48-port patch panel. Which tool is required to properly seat each wire into the IDC connectors on the back of the patch panel?Network Implementation
  33. 33.A network administrator wants a single Layer 3 switch to route traffic between VLAN 10, VLAN 20, and VLAN 30 using only one physical interface connected to a Layer 2 switch trunk. Which configuration approach should the administrator use?Network Implementation
  34. 34.A company is allocated the network 192.168.10.0/24 and needs to create subnets that each support at least 50 hosts while wasting as few addresses as possible. Which subnet mask should be used?Networking Concepts
  35. 35.A small office wants a topology where every workstation connects directly to a central switch, and the failure of one cable only affects that single device. Which topology is being described?Networking Concepts
  36. 36.An attacker positions a laptop between a victim and a legitimate website using a rogue access point, then intercepts the victim's HTTPS session and forces the browser to communicate over unencrypted HTTP instead, silently capturing login credentials. Which attack technique is being used?Network Security
  37. 37.A workstation is manually configured with a valid IP address, subnet mask, and DNS server. Users can access other devices on the local subnet but cannot reach any external websites. Which missing configuration setting most likely explains this issue?Networking Concepts
  38. 38.A network administrator increases the MTU on a core router interface to 9000 bytes for jumbo frame support, but forgets to update an edge switch, which remains at the default 1500-byte MTU. Users report that small file downloads work fine, but large file transfers across this path consistently fail or hang. What is the MOST likely explanation?Network Troubleshooting
  39. 39.A technician is troubleshooting poor Wi-Fi performance in a small office. A Wi-Fi analyzer shows three access points operating on channels 3, 7, and 10 in the 2.4GHz band. What is the MOST likely cause of the performance issues?Network Troubleshooting
  40. 40.An organization is redesigning its network security model based on the principle that no user or device should be automatically trusted, regardless of whether they are inside or outside the corporate network perimeter. Which security concept is being implemented?Networking Concepts
  41. 41.A network technician is troubleshooting a client workstation that can access local network resources but cannot reach any external websites or services. The technician pings the local gateway, which responds successfully. Next, the technician attempts to ping 8.8.8.8 (Google's public DNS server) and receives 'Request timed out.' messages. Which of the following is the MOST likely cause of this issue?Network Troubleshooting
  42. 42.A network administrator is deploying an SNMP-based monitoring solution across the enterprise. Management requires that all polling traffic between the network management station and managed devices be both encrypted and authenticated with per-user credentials. Which SNMP version should the administrator implement?Network Operations
  43. 43.A small business has only one public IP address but needs to allow dozens of internal devices to access the internet simultaneously. Which technology allows all devices to share the single public IP by distinguishing sessions with different port numbers?Networking Concepts
  44. 44.A network administrator is configuring an internal addressing scheme for a lab network that will never be routed on the public internet, similar in purpose to private IPv4 address ranges. Which IPv6 address type and prefix should be used?Networking Concepts
  45. 45.A hotel wants guest devices connected to the same VLAN and IP subnet to be completely unable to communicate with one another, while every guest device must still reach the internet gateway. Which switch feature should be configured to achieve this?Network Security
  46. 46.A user reports that their workstation is unable to connect to the network. The technician inspects the workstation and confirms that the network cable is securely plugged into both the workstation and the wall jack. The link lights on both the workstation's NIC and the switch port are unlit. Which of the following is the MOST likely cause?Network Troubleshooting
  47. 47.A network administrator is troubleshooting an issue where a newly deployed VoIP phone system is experiencing frequent call drops and garbled audio. A packet capture reveals significant packet reordering and high jitter values. The network infrastructure consists of several switches and routers. Which of the following is the MOST likely cause of these symptoms?Network Troubleshooting
  48. 48.Employees in a warehouse report that their wireless connections drop intermittently throughout the day, and a spectrum analyzer shows a persistent high noise floor across the entire 2.4 GHz band with no identifiable data traffic pattern. No unauthorized SSIDs are detected. Which type of attack is most likely occurring?Network Security
  49. 49.A technician is troubleshooting a server that is intermittently losing network connectivity. The server is connected via a Cat 6 cable to a network switch. During inspection, the technician notices the cable runs parallel to a large, unshielded power conduit for approximately 15 meters. Which of the following is the MOST likely cause of the intermittent connectivity?Network Troubleshooting
  50. 50.A legacy manufacturing facility uses a single coaxial backbone cable with terminators installed at each end. All devices connect directly to this shared cable segment. Which network topology does this describe?Networking Concepts