CompTIA N10-009 Practice Exams
Last updated on Oct 22,2026- Exam Code: N10-009
- Exam Name: CompTIA Network+ Certification
- Certification Provider: CompTIA
- Latest update: Oct 22,2026
A network administrator is configuring a wireless network with an ESSID.
Which of the following is a user benefit of ESSID compared to SSID?
- A . Stronger wireless connection
- B . Roaming between access points
- C . Advanced security
- D . Increased throughput
Which of the following disaster recovery concepts is calculated by dividing the total hours of operation by the total number of units?
- A . MTTR
- B . MTBF
- C . RPO
- D . RTO
Which of the following attacks utilizes a network packet that contains multiple network tags?
- A . MAC flooding
- B . VLAN hopping
- C . DNS spoofing
- D . ARP poisoning
Which of the following describes the best reason for using BGP?
- A . Preventing a loop within a LAN
- B . Improving reconvergence times
- C . Exchanging router updates with a different ISP
- D . Sharing routes with a Layer 3 switch
A network engineer receives a vendor alert regarding a vulnerability in a router CPU.
Which of the following should the engineer do to resolve the issue?
- A . Update the firmware.
- B . Replace the system board.
- C . Patch the OS.
- D . Isolate the system.
A network engineer receives a vendor alert regarding a vulnerability in a router CPU.
Which of the following should the engineer do to resolve the issue?
- A . Update the firmware.
- B . Replace the system board.
- C . Patch the OS.
- D . Isolate the system.
Early in the morning, an administrator installs a new DHCP server. In the afternoon, some users report they are experiencing network outages.
Which of the following is the most likely issue?
- A . The administrator didnot provision enough IP addresses.
- B . The administrator configured an incorrect default gateway.
- C . The administrator didnot provision enough routes.
- D . The administrator didnot provision enough MAC addresses.
A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email.
Which of the following should the engineer have done to prevent the issue from occurring?
- A . Change the email client configuration to match the MX record.
- B . Reduce the TTL record prior to the MX record change.
- C . Perform a DNS zone transfer prior to the MX record change.
- D . Update the NS record to reflect the IP address change.
A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email.
Which of the following should the engineer have done to prevent the issue from occurring?
- A . Change the email client configuration to match the MX record.
- B . Reduce the TTL record prior to the MX record change.
- C . Perform a DNS zone transfer prior to the MX record change.
- D . Update the NS record to reflect the IP address change.
Which of the following most likely requires the use of subinterfaces?
- A . A router with only one available LAN port
- B . A firewall performing deep packet inspection
- C . A hub utilizing jumbo frames
- D . A switch using Spanning Tree Protocol