Network security questions on Network+ are not just vocabulary. The exam wants to know whether you can look at a messy support scenario and choose the safest, most practical next move.
Here is the fast answer: for Network+ network security, know firewalls, ACLs, VPNs, VLAN segmentation, wireless security, IDS/IPS alerts, least privilege, physical security, and basic hardening. More importantly, know how those ideas show up in real tickets: “the app works from one subnet but not another,” “guest Wi-Fi can reach internal printers,” and “VPN connects but nothing opens.”
Use these practice questions like small help desk escalations. Pick the best answer, then read the explanation. If you are weak on the basics, pair this with the Network+ VLAN practice questions, Network+ routing practice questions, and Network+ common ports practice questions.
Quick network security cheat sheet before the questions
| Concept | Plain-English meaning | Ticket clue |
|---|---|---|
| Firewall rule | Allows or blocks traffic by source, destination, port, and protocol | “Only this subnet cannot reach the app” |
| ACL | A traffic filter, often on routers, switches, or firewalls | “Permit this, deny that” |
| Segmentation | Keeping networks separated to reduce blast radius | Guest, IoT, server, user, and management VLANs |
| Least privilege | Give only the access required | “Everyone has admin because it was easier” |
| VPN | Encrypted access into a private network | Connects successfully, but routes or rules fail |
| IDS/IPS | Detects or blocks suspicious traffic | Alert noise, blocked scan, repeated exploit attempts |
| WPA3/WPA2 Enterprise | Stronger wireless authentication | Shared passwords vs per-user identity |
| Management plane | Admin access to devices | SSH, HTTPS admin UI, SNMP, console ports |
Now let’s make it practical.
Practice question 1: guest Wi-Fi can reach internal printers
A small office has a guest wireless network for visitors. A help desk tech notices that a guest laptop can print to an internal accounting printer. The guest network should only reach the internet.
What is the best fix?
A. Rename the guest SSID
B. Put the printer on the guest network too
C. Add or correct firewall rules that block guest-to-internal traffic
D. Disable DHCP on the guest network
Answer: C. Add or correct firewall rules that block guest-to-internal traffic.
This is a segmentation failure. Guest devices should not be able to reach internal printers, file shares, management interfaces, or business apps. Renaming the SSID changes the label, not the isolation. Disabling DHCP just breaks normal access. The fix is to enforce network boundaries with VLANs and firewall rules so guest traffic goes to the internet and nowhere else.
Practice question 2: VPN connects, internal app fails
A remote user connects to the company VPN successfully. They can browse the public internet, but they cannot open an internal web app at 10.40.12.25. Other VPN users in the “Finance VPN” group can reach it.
What should you check first?
A. Whether the user is in the correct VPN access group
B. Whether the user’s home router supports IPv6
C. Whether the public website is down
D. Whether the app server needs a new monitor
Answer: A. Whether the user is in the correct VPN access group.
The VPN tunnel working does not mean the user has every internal route and firewall permission. VPN access is often group-based. If Finance VPN users can reach the app and this user cannot, check group membership, split-tunnel routes, and firewall policy tied to the user group. Do not rebuild the laptop just because “VPN” appears in the ticket.
For the full remote-access flow, use the VPN troubleshooting checklist.
Practice question 3: exposed switch management page
A network scan finds that several access switches expose their web management interfaces to the normal user VLAN. Users do not need to manage switches.
What is the best security improvement?
A. Move management access to a dedicated management network and restrict it to admin sources
B. Change the switch names to something less obvious
C. Disable all switch ports until someone complains
D. Put the switches in the same VLAN as the printers
Answer: A. Move management access to a dedicated management network and restrict it to admin sources.
Device management interfaces should not be reachable from every user laptop. Use a management VLAN or dedicated management network, restrict access to admin jump boxes or approved IT subnets, and require strong authentication. This reduces the chance that a compromised workstation can poke at switch admin pages like it has nothing better to do.
Practice question 4: ACL order matters
A router ACL contains these rules in order:
| Order | Rule |
|---|---|
| 1 | Deny 10.20.0.0/16 to 10.50.10.10 on TCP 443 |
| 2 | Permit 10.20.30.0/24 to 10.50.10.10 on TCP 443 |
| 3 | Deny all |
A host at 10.20.30.55 tries to reach 10.50.10.10 on HTTPS. What happens?
A. It is allowed because rule 2 is more specific
B. It is denied because rule 1 matches first
C. It is allowed because HTTPS is always trusted
D. It is denied only if DNS fails
Answer: B. It is denied because rule 1 matches first.
ACLs are commonly processed top-down. Even though rule 2 is more specific, rule 1 appears first and matches the source range 10.20.0.0/16, which includes 10.20.30.55. In real support work, “the rule exists” is not enough. The order, direction, interface, source, destination, protocol, and default deny behavior all matter.
Practice question 5: wireless password shared with everyone
A company uses one shared Wi-Fi password for employees, contractors, and temporary staff. Nobody knows who has it anymore. A manager asks for a better approach.
What is the best recommendation?
A. Keep the shared password but make it longer
B. Use per-user authentication such as WPA2/WPA3 Enterprise where practical
C. Hide the SSID and call it done
D. Change the password once every ten years
Answer: B. Use per-user authentication such as WPA2/WPA3 Enterprise where practical.
A stronger shared password is still shared. When someone leaves, you cannot cleanly remove just that person. Enterprise wireless authentication ties access to individual identities, which supports revocation, logging, and policy control. Small environments may still use pre-shared keys, but the security direction is per-user access, not “hope nobody posted the password in a chat from 2021.”
Practice question 6: IDS alert after a vulnerability scan
The security team runs an approved vulnerability scan against internal servers. The IDS generates many alerts showing port scans and service probes from the scanner IP.
What is the best interpretation?
A. The IDS is broken because approved scans should never alert
B. The alerts may be expected, but they should be correlated with the approved scan window
C. The servers are definitely compromised
D. The scanner should be blocked from the network forever
Answer: B. The alerts may be expected, but they should be correlated with the approved scan window.
IDS alerts need context. Vulnerability scanners intentionally probe systems, so alerts during an approved scan may be normal. Confirm the source IP, timing, scan authorization, and whether any unexpected targets appeared. Good security operations is not “panic at every red icon.” It is evidence plus context.
Practice question 7: printer needs one server, not the whole subnet
A printer in the user VLAN needs to send scans to a document server. Someone suggests allowing the printer VLAN to reach the entire server subnet “so we do not have to troubleshoot later.”
Which principle argues against that?
A. Least privilege
B. Maximum throughput
C. Collision detection
D. Dynamic routing
Answer: A. Least privilege.
Least privilege means allowing only what is required. If the printer needs one server on one port, allow that path. Do not open the whole server subnet just because it saves ten minutes today. Document the allowed flow so the next tech understands why it exists.
Practice question 8: rogue DHCP symptoms
Users on one floor suddenly receive IP addresses from the wrong range. They can connect to Wi-Fi but cannot access internal apps. The default gateway and DNS servers are also wrong.
What security-related issue should you suspect?
A. A rogue DHCP server or misconfigured network device
B. A failed keyboard driver
C. A bad browser bookmark
D. A printer toner alert
Answer: A. A rogue DHCP server or misconfigured network device.
Wrong DHCP information can redirect or break traffic quickly. Sometimes it is malicious. More often, someone plugged in a consumer router or misconfigured a lab device. Either way, find the source, disable it, and consider DHCP snooping or switch protections where appropriate.
If DHCP itself is fuzzy, review DHCP explained for IT professionals.
Practice question 9: firewall rule direction
A new firewall rule is added to allow a monitoring server to check a web app on TCP 443. The rule allows traffic from the app server to the monitoring server instead. The check still fails.
What is the likely problem?
A. The rule direction/source-destination is reversed
B. TCP 443 cannot be monitored
C. Monitoring servers never need firewall rules
D. The app must be converted to UDP
Answer: A. The rule direction/source-destination is reversed.
Firewall rules are picky because networks are picky. A health check from the monitoring server to the app server is not the same as traffic from the app server to the monitoring server. When a rule “looks right” but fails, verify source, destination, port, protocol, zone, and direction.
Practice question 10: default deny policy
A company wants to harden a sensitive internal subnet. The current firewall policy allows most internal networks by default and blocks only known bad traffic.
What policy is usually safer for a sensitive subnet?
A. Allow all traffic unless users complain
B. Default deny, then explicitly allow required traffic
C. Disable logging so alerts do not pile up
D. Put every server in the user VLAN
Answer: B. Default deny, then explicitly allow required traffic.
For sensitive segments, default deny is the cleaner security model. Start blocked, then open documented flows for real business needs. This takes more planning, but it prevents accidental broad access.
What to study after these questions
If these felt rough, study in this order:
- Traffic basics: source, destination, ports, protocols, and stateful inspection.
- Segmentation: VLANs, guest networks, server networks, user networks, and management networks.
- Remote access: VPN authentication, authorization groups, split tunnel routes, and firewall policies.
- Wireless security: WPA2/WPA3, Enterprise authentication, guest isolation, and captive portals.
- Detection: IDS vs IPS, vulnerability scans, logs, and alert context.
- Hardening: least privilege, default deny, secure management, and physical access controls.
For hands-on networking practice, connect this page with subnetting practice, routing practice, and Wi-Fi troubleshooting. Network security is easier when the basic path makes sense.
FAQ
Are Network+ security questions the same as Security+ questions?
No. Network+ security questions usually focus on securing network traffic, devices, wireless access, segmentation, VPNs, and monitoring. Security+ goes broader into risk, identity, cryptography, incident response, governance, and architecture. There is overlap, but the angle is different.
Do I need to memorize every firewall command for Network+?
No. Network+ is vendor-neutral. You should understand how firewall rules work, how ACL order can affect traffic, and how to troubleshoot source/destination/port mistakes. You do not need to memorize a specific vendor’s CLI for every device.
Keep practicing without turning it into trivia
The goal is not to collect flashcards until your brain starts making modem noises. The goal is to recognize patterns: wrong group, wrong rule, wrong VLAN, wrong direction, wrong assumption.
If you want more certification practice, start with the CompTIA A+ security practice questions or the Security+ access control practice questions. If you are job hunting, use these scenarios as interview prep too.