CompTIA N10-009: CompTIA Network+

Last checked October 22, 2026 against the official CompTIA exam page.

1. Question 1Networking Fundamentals

   A switch receives a frame whose destination MAC address is not in its MAC address table. What does the switch do by default?

   1. ADrops the frame silently
   2. BReturns the frame to the sender
   3. CSends the frame only to the default gateway
   4. DFloods the frame out all ports in the same VLAN except the one it arrived on
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   Correct answer: D

   An unknown unicast frame is flooded to all other ports in the VLAN so the destination can respond and the switch can learn its location. Dropping, gateway-only forwarding, and returning frames are not default switch behaviour.

2. Question 2Network Security

   A firewall rule must allow web traffic only from the internal subnet to the internet. Which principle does this apply?

   1. ALeast privilege
   2. BBroadcast flooding
   3. COpen-by-default
   4. DFull access
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   Correct answer: A

   Allowing only the specific traffic needed applies least privilege, which limits exposure. Full access, open-by-default rules, and broadcast flooding are contrary to this principle.

3. Question 3Network Troubleshooting and Tools

   A user can reach local devices but not the internet. Other users on the same subnet have internet access. Which item should be checked first on the affected workstation?

   1. AKeyboard layout and locale
   2. BDefault gateway configuration
   3. CMonitor display brightness
   4. DPrinter driver revision
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   Correct answer: B

   If local traffic works but external does not, the default gateway is a common cause. Monitor brightness, keyboard layout, and printer drivers are unrelated to routing.

4. Question 4Network Operations

   Which documentation item shows how devices are physically connected, including port-to-port links?

   1. AStaff rota for on-call engineers
   2. BSoftware licence sheet for SaaS
   3. CNetwork diagram and cable map
   4. DQuarterly regional sales report
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   Correct answer: C

   Network diagrams and cable maps show physical and logical connections, which are essential for troubleshooting. Sales reports, rotas, and licence sheets do not show connections.

5. Question 5Network Implementations

   A branch office must connect to headquarters over the internet with encryption. Which technology is most appropriate?

   1. AIPsec VPN
   2. BWi-Fi bridging
   3. CSerial console
   4. DUnencrypted GRE tunnel
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   Correct answer: A

   An IPsec VPN encrypts traffic across the internet between sites. Unencrypted tunnels provide no confidentiality, Wi-Fi bridging is local, and a serial console is for management.