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CompTIA Network+ study guide

CompTIA Network+

Free CompTIA Network+ study guide and exam blueprint. 90 questions in 90 minutes. Written from CompTIA's N10-009 objectives v6.0, last checked 15 August 2026. Domain weightings, glossary, and practice questions with worked explanations.

Written from CompTIA's N10-009 objectives v6.0. Last checked against that document on 15 August 2026.

90 questions 90 minutes 5 domains

Orientation

The exam that asks what broke.

Network+ is not a vocabulary test. It gives you a symptom and expects you to name the cause and the tool that proves it. Almost a quarter of the paper is troubleshooting alone, and most of the rest is written so that knowing a definition without knowing what happens when it is misconfigured will not earn the mark.

Two things that catch people out

Subnetting under time pressure. You have roughly one minute per question and subnetting questions take longer than that unless the arithmetic is automatic. Practice until you are not calculating, you are recognizing.

Performance-based questions. A handful of items drop you into a simulated task rather than offering four options. They usually come first, they take longer, and candidates who work through them in order run out of time. Skip them, finish the multiple choice, then return.

What you are walking into

Up to 90 questions in 90 minutes, a mix of multiple choice and performance-based items. You need 720 on a scale of 100 to 900. That looks like about 80%, but CompTIA uses scaled scoring where harder items carry more weight, so it is not a clean percentage and you should not treat it as one.

There is no hard prerequisite. CompTIA recommends A+ or equivalent knowledge and nine to twelve months of networking experience, but plenty of people pass without either. What is not optional is hands-on familiarity: this exam is written by people who expect you to have plugged things in.

Where the marks are

Troubleshooting at 24% and networking concepts at 23% are 47% of the exam between them. Splitting your study time evenly across five domains means under-preparing for nearly half the paper and over-preparing for security, which carries the lightest weight at 14%.

That security weighting surprises people who came from Security+. CompTIA deliberately moved the deeper security material onto that track, so here you get network-layer hardening and common attacks rather than a security curriculum.

What changed in N10-009

This version launched in June 2024 and shifted weight toward troubleshooting and operations while trimming security. If your material does not say N10-009 on it, replace it. The additions reflect what networks actually look like now:

Cloud and hybrid networking, including VPCs, cloud gateways and connectivity options.
SDN and SD-WAN, with centralized policy and application-aware routing.
Zero trust, SASE and SSE as named concepts rather than passing mentions.
Modern wireless, including Wi-Fi 6 and 6E.
Network automation fundamentals and infrastructure as code.

Your study plan

Exam objectives

What the exam is made of.

Five domains. Troubleshooting is the largest, and it is the one that rewards experience over memorization.

23%Networking Concepts20%Implementation19%Operations14%Security24%Troubleshooting

Five domains Up to 90 questions · 90 minutes · 720/900

Read the bar as a budget for your hours. Troubleshooting and concepts together are 47%. Security is 14%, the smallest slice, and over-studying it is the most common misallocation among people arriving from a security background.

The five domains

Domain	Weight	What it covers
1.0 Networking Concepts	23%	OSI model, appliances, cloud concepts, ports and protocols, traffic types, transmission media, topologies, IPv4 addressing and subnetting, IPv6, plus SDN, SD-WAN, VXLAN and zero trust.
2.0 Network Implementation	20%	Routing and switching configuration, VLANs, spanning tree, wireless deployment and standards, and physical installation.
3.0 Network Operations	19%	Documentation, life-cycle management, change and configuration management, monitoring, disaster recovery metrics, and remote access.
4.0 Network Security	14%	Logical and physical security, common attacks, hardening, segmentation and access control. The smallest domain.
5.0 Network Troubleshooting	24%	The largest domain. The methodology, cable and wireless faults, general network issues, and the tools that isolate each.

The format

Questions	Maximum 90. Multiple choice plus performance-based simulations.
Time	90 minutes. Roughly one minute per question.
Pass mark	720 on a 100 to 900 scale. Scaled, so not a clean percentage.
Prerequisite	None required. A+ and 9 to 12 months of networking experience recommended.
Delivery	Pearson VUE, test center or online proctored.
Validity	Three years, renewable through CompTIA's continuing education program.

What this mock does not include

Performance-based questions. Those are simulated tasks, and no practice tool outside CompTIA's own reproduces them faithfully. Everything else here matches: the domain weighting, the clock, and the question style. Treat the PBQs as a separate thing to prepare for with hands-on practice, not something a question bank can substitute for.

Domain 1 23%

Networking concepts.

Nearly a quarter of the exam, and the foundation every other domain leans on. This is also where subnetting lives, which is the single most time-consuming thing on the paper.

The OSI model

Learn the layers in both directions, and learn what lives at each. The exam uses layer numbers as shorthand constantly, and troubleshooting questions often hinge on identifying which layer a symptom belongs to.

Layer	Name	What lives there
7	Application	HTTP, FTP, DNS, SMTP. What the user interacts with.
6	Presentation	Encryption, compression, encoding formats.
5	Session	Establishing, managing and ending sessions.
4	Transport	TCP and UDP. Ports, segmentation, reliability.
3	Network	IP addressing and routing. Routers live here.
2	Data link	MAC addresses, frames, switches.
1	Physical	Cables, connectors, signaling, hubs.

A useful diagnostic habit the exam rewards: a cable fault is layer 1, a VLAN or MAC issue is layer 2, an IP or routing issue is layer 3, and a port or firewall issue is layer 4.

Ports and protocols to know cold

Port	Protocol	Port	Protocol
20, 21	FTP	161, 162	SNMP
22	SSH, SFTP, SCP	389	LDAP
23	Telnet	443	HTTPS
25	SMTP	445	SMB
53	DNS	514	Syslog
67, 68	DHCP	636	LDAPS
69	TFTP	1433	SQL Server
80	HTTP	3306	MySQL
110	POP3	3389	RDP
123	NTP	5060, 5061	SIP
143	IMAP	—	—

Also know which use TCP and which use UDP. DNS uses both (UDP for queries, TCP for zone transfers and large responses). DHCP, TFTP, SNMP and Syslog are UDP. Most of the rest are TCP.

IPv4 addressing and subnetting

Private ranges (RFC 1918): 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. Learn these; they appear constantly.
Loopback: 127.0.0.0/8. APIPA: 169.254.0.0/16, which is what a host self-assigns when DHCP fails. Seeing a 169.254 address is a diagnostic finding, not a configuration.
CIDR notation and the relationship between prefix length, subnet mask, host count and usable hosts. Usable hosts is 2 to the power of remaining bits, minus 2 for network and broadcast.
VLSM lets you use different prefix lengths within the same network, which is how address space is used efficiently.

The subnetting numbers worth memorizing

/24 = 256 addresses, 254 usable. /25 = 128 (126). /26 = 64 (62). /27 = 32 (30). /28 = 16 (14). /29 = 8 (6). /30 = 4 (2), the classic point-to-point link. Knowing these instantly turns a two-minute calculation into a five-second recall, and the clock is the real adversary here.

IPv6

128-bit addresses written in hexadecimal, with :: compressing one run of consecutive zero groups (only one per address).
SLAAC lets a host configure itself from a router advertisement, without DHCP.
Dual stack runs IPv4 and IPv6 side by side; tunneling carries IPv6 traffic across IPv4 infrastructure.
There is no broadcast in IPv6. Its place is taken by multicast and anycast.

Topologies, media and traffic types

Traffic types: unicast (one to one), multicast (one to many subscribers), anycast (one to the nearest of many), broadcast (one to all on the segment, IPv4 only).
Topologies: star or hub-and-spoke, mesh, hybrid, and the three-tier model of core, distribution and access. A collapsed core merges core and distribution, which is common in smaller networks.
Copper: Cat 5e (1 Gbps), Cat 6 (10 Gbps to 55 m), Cat 6a (10 Gbps to 100 m), Cat 8 (short-run data center). Copper is limited to 100 meters for Ethernet.
Fiber: single-mode for long distance with a narrow core and laser source; multimode for shorter runs, cheaper optics, larger core.

Modern additions in N10-009

Concept	What it means
SDN	Software-defined networking: separating the control plane from the data plane so the network is programmed centrally.
SD-WAN	Applying that centralized, application-aware control to wide-area links, often across mixed transports.
VXLAN	Encapsulation that extends layer 2 segments across a layer 3 network, lifting the VLAN limit.
Zero trust	Never trust, always verify. No implicit trust from being inside the perimeter.
SASE / SSE	Delivering networking and security together from the cloud, close to the user rather than backhauled.
IaC	Infrastructure as code: defining network configuration in version-controlled files rather than by hand.

Domain 2 20%

Network implementation.

Configuration: routing, switching, wireless and the physical layer. This domain assumes you have done the work, and questions are written from the perspective of someone standing at a console.

Routing

Protocol	Type	Notes
Static	Manual	No overhead, no adaptation. Fine for stub networks and default routes.
OSPF	Link state, interior	Uses cost based on bandwidth. Areas, with area 0 as the backbone.
EIGRP	Advanced distance vector, interior	Cisco-originated. Fast convergence, uses bandwidth and delay.
RIP	Distance vector, interior	Hop count, maximum 15. Largely legacy but still examined.
BGP	Path vector, exterior	The routing protocol of the internet. Routes between autonomous systems.

NAT and PAT. NAT translates addresses; PAT (also called NAT overload) maps many private addresses to one public address using port numbers. PAT is what almost every home and office network actually runs.
FHRP (first hop redundancy protocols) such as VRRP and HSRP present a virtual IP so hosts keep a working default gateway when a router fails.
Subinterfaces let one physical interface carry multiple VLANs, which is how router-on-a-stick works.

Switching

VLANs segment a switch into separate broadcast domains. 802.1Q tags frames so multiple VLANs traverse one trunk link. An access port carries one VLAN untagged; a trunk port carries several tagged.
Spanning Tree Protocol prevents switching loops by blocking redundant paths. Without it, a loop floods the segment and takes the network down, which is the classic broadcast storm.
Link aggregation (LACP) bonds several physical links into one logical link for bandwidth and redundancy.
Port security restricts which MAC addresses may use a port. 802.1X requires authentication before the port passes traffic.
PoE delivers power over the data cable. Know that a switch has a power budget and that exceeding it is a real failure mode.
MTU and jumbo frames. Standard MTU is 1500 bytes; jumbo frames go to around 9000 and must be consistent end to end or you get fragmentation and mysterious failures.

Wireless

Standard	Common name	Bands
802.11n	Wi-Fi 4	2.4 and 5 GHz
802.11ac	Wi-Fi 5	5 GHz
802.11ax	Wi-Fi 6 / 6E	2.4, 5, and 6 GHz for 6E

Channels. In 2.4 GHz only 1, 6 and 11 are non-overlapping, which is why dense deployments interfere with themselves. 5 GHz has far more non-overlapping channels.
Encryption. WPA2 uses AES-CCMP. WPA3 adds SAE, which replaces the pre-shared key handshake and resists offline dictionary attacks.
Authentication. Personal uses a pre-shared key; enterprise uses 802.1X with a RADIUS server; captive portals authenticate through a web page, typically for guests.
Site surveys and heat maps establish coverage, channel plan and interference before deployment, and diagnose complaints afterward.

Physical installation

MDF is the main distribution frame, the primary point where external circuits meet the internal network. IDFs are intermediate frames distributed through a building, connected back to the MDF.

Know the power vocabulary: a UPS provides battery power through short outages and allows clean shutdown; a PDU distributes power within a rack. Environmental factors, particularly heat and humidity, are examinable because they cause failures that look like network faults.

Domain 3 19%

Network operations.

The day-to-day work of keeping a network running and documented. N10-009 leaned harder into this than previous versions, reflecting what junior staff actually get handed.

Documentation

Physical and logical diagrams. Physical shows what is plugged into what; logical shows addressing, VLANs and traffic flow.
Rack diagrams and cable maps record placement and connections, which is what makes a fault findable at 2am.
IPAM (IP address management) tracks address allocation so you do not discover a duplicate by outage.
Baseline. A record of normal performance. Without one, you cannot say whether current behavior is abnormal, which is why it is a troubleshooting prerequisite as much as a documentation task.
SLA documents the agreed level of service, and is what escalation decisions are measured against.

Life-cycle and change management

EOL (end of life) means no longer sold; EOS (end of support) means no longer patched. EOS is the one that creates the security exposure.
Change management requires a documented request, impact assessment, approval, an implementation plan and, critically, a rollback plan.
Configuration management keeps a known-good baseline of device configuration so drift is visible and recovery is possible.
Decommissioning includes sanitizing configuration and data before hardware leaves the building.

Monitoring

Method	What it gives you
SNMP	Device metrics by polling, plus traps sent by the device when something happens.
Syslog	Event messages centralized on a collector, with severity levels.
Flow data (NetFlow and similar)	Who talked to whom, how much, and on what ports. Traffic patterns rather than packet contents.
Packet capture	The actual packets. Highest detail, highest effort, usually via a port mirror or a network tap.
SIEM	Aggregating and correlating logs across systems to surface patterns.

Disaster recovery metrics

Four abbreviations the exam tests by definition and by scenario. Learn them precisely, because they are easy to blur.

Term	Meaning
RPO	Recovery point objective: how much data you can afford to lose, measured backward in time. Drives backup frequency.
RTO	Recovery time objective: how long you can afford to be down. Drives recovery design.
MTTR	Mean time to repair: the average time to restore after a failure.
MTBF	Mean time between failures: the average time a component runs before failing.

Recovery sites: a cold site is space and power only; a warm site has equipment but needs data and configuration; a hot site is ready to run; active-active means both sites carry load already. Cost rises across that list, and so does speed of recovery.

Remote access

Site-to-site VPN joins two networks permanently. Client-to-site connects one user in. Clientless works through a browser without installed software.
Split tunnel sends only corporate traffic through the VPN; full tunnel sends everything. Split is faster and lighter, full gives more control and inspection.
SSH for secure command line, RDP for remote desktop, console access for when the network itself is the problem. Out-of-band management exists precisely because in-band access fails exactly when you need it.

Domain 4 14% · smallest

Network security.

The smallest domain at 14%, and deliberately so: CompTIA moved the deeper security material onto the Security+ track. What is here is network-layer, and the attack list is the part most worth drilling.

Core concepts

CIA triad: confidentiality, integrity, availability. Most security questions map to one of these three.
AAA: authentication (who are you), authorization (what may you do), accounting (what did you do).
Zero trust: no implicit trust from network location. Verify every request.
Defense in depth: layered controls, so no single failure exposes everything.
Least privilege: the minimum access needed to do the job.

Authentication and access

Technology	What it does
RADIUS	Centralized authentication, commonly behind 802.1X and wireless enterprise mode. Encrypts only the password.
TACACS+	Similar role, separates authentication, authorization and accounting, and encrypts the whole payload. Common for device administration.
LDAP	Directory lookup for users and groups. LDAPS is the encrypted form on 636.
SAML	Exchanging authentication assertions between identity provider and service, which is how much web SSO works.
MFA	Two or more factors: something you know, have, or are.
802.1X	Port-based access control. The port passes no traffic until authentication succeeds.

Common attacks

Expect to be given a symptom and asked to name the attack. Learn these by what they look like from the defender's seat.

Attack	What it does
ARP spoofing / poisoning	Sends forged ARP replies so traffic for another host reaches the attacker. Enables on-path interception.
MAC flooding	Overwhelms the switch MAC table so it floods frames to all ports, exposing traffic.
VLAN hopping	Reaches a VLAN the attacker should not, via double tagging or switch spoofing.
DNS poisoning / spoofing	Corrupts name resolution so a legitimate name resolves to a hostile address.
Rogue DHCP	An unauthorized DHCP server hands out addresses and a hostile default gateway.
Evil twin	A malicious access point impersonating a legitimate SSID.
On-path	The attacker sits between two parties and can read or alter traffic.
DoS / DDoS	Exhausts a resource so legitimate users cannot be served. DDoS uses many sources.
Social engineering	Phishing, tailgating, pretexting. The technical controls are bypassed by asking a person.

Hardening and segmentation

Disable unused ports and services, change default credentials, and keep firmware current. Unglamorous and heavily examined.
Segmentation separates IoT devices, guest access and BYOD from the corporate network, limiting what a compromise can reach.
ACLs permit or deny traffic by address, port and protocol. Order matters, and there is an implicit deny at the end.
DHCP snooping blocks rogue DHCP servers; dynamic ARP inspection blocks ARP spoofing. Both are switch features that defeat named attacks above, and pairing them in your memory is efficient.
Honeypots and honeynets are deliberately exposed systems used to detect and study attackers.

Domain 5 24% · largest

Troubleshooting.

The largest domain, and the one that separates people who have worked on networks from people who have read about them. The methodology itself is testable, in order, and it is free marks.

CompTIA's seven-step methodology, in order

1. Identify the problem. Gather information, question users, determine what changed.
2. Establish a theory of probable cause. Question the obvious first.
3. Test the theory to determine the cause. If it is not confirmed, establish a new theory or escalate.
4. Establish a plan of action to resolve the problem and identify potential effects.
5. Implement the solution or escalate as necessary.
6. Verify full system functionality and, if applicable, implement preventive measures.
7. Document findings, actions and outcomes.

Questions give you a scenario mid-process and ask what comes next. The two most commonly missed: testing the theory comes before planning a fix, and documentation is last, not optional.

The tools, and what each proves

Tool	Use it to
ping	Test reachability and round-trip time. Uses ICMP, which some devices block.
traceroute / tracert	Show the path and where it stops. The last responding hop points at the problem area.
nslookup / dig	Query DNS directly. Proves whether a failure is name resolution or connectivity.
ipconfig / ifconfig / ip	Show local addressing. A 169.254 address here means DHCP failed.
netstat	Show active connections and listening ports on the host.
arp	Show the MAC-to-IP table. Duplicate or unexpected entries point at spoofing or a duplicate address.
nmap	Discover hosts and open ports across a network.
tcpdump / Wireshark	Capture and inspect actual packets when nothing else explains the behavior.
iperf	Measure achievable throughput between two endpoints.
Cable tester / wire map	Confirm continuity and correct pinout.
Tone generator and probe	Find which cable is which in a bundle or patch panel.
OTDR	Locate a break or high loss along a fiber run, by distance.
Spectrum analyzer	Identify RF interference affecting wireless.

Cable and physical faults

Attenuation is signal loss over distance. Exceeding 100 m on copper is the usual cause.
Crosstalk is signal bleeding between pairs, often from untwisting too much at a termination.
EMI from fluorescent lights, motors or power cabling degrades copper. Fiber is immune, which is sometimes the answer.
Incorrect pinout, opens, shorts and transposed TX/RX all show as no link or unstable link, and a wire map identifies which.
Duplex mismatch gives a working but terrible link with collisions and late collisions rising. It is a classic because the link is up, so it looks like something else.

Common network issues and their signatures

Symptom	Likely cause
Host has a 169.254.x.x address	DHCP unreachable or scope exhausted. APIPA self-assignment.
Can reach by IP but not by name	DNS. Resolution is failing while connectivity is fine.
Intermittent connectivity for some hosts only	Duplicate IP address, or a rogue DHCP server issuing conflicting configuration.
Network-wide slowdown, high broadcast traffic	Switching loop, typically spanning tree disabled or misconfigured.
Certificate and authentication failures across many systems	Time drift. NTP is not synchronizing.
Wireless drops when moving between areas	Roaming or coverage gap; check overlap and signal levels with a survey.
Wireless slow in a dense office at 2.4 GHz	Channel overlap. Only 1, 6 and 11 are non-overlapping.
Traffic reaches the gateway but goes no further	Missing or incorrect route, or an ACL denying the traffic.

The habit the exam rewards: work up the OSI layers. Confirm the physical link, then addressing, then routing, then the application. Most wrong answers in troubleshooting questions are correct actions taken in the wrong order.

Reference

Glossary.

The terms this exam is built from, grouped so the ones that get confused sit together.

OSI layers: 7 Application, 6 Presentation, 5 Session, 4 Transport, 3 Network, 2 Data link, 1 Physical.
Layer shorthand for faults: Cable = L1. VLAN or MAC = L2. IP or routing = L3. Port or firewall = L4.
Unicast / multicast / anycast / broadcast: One to one / one to many subscribers / one to the nearest / one to all on the segment (IPv4 only).
RFC 1918 private ranges: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.
APIPA: 169.254.0.0/16. Self-assigned when DHCP fails. A diagnostic finding, not a configuration.
Subnet sizes: /24 = 254 usable, /25 = 126, /26 = 62, /27 = 30, /28 = 14, /29 = 6, /30 = 2.
SLAAC / dual stack / tunneling: IPv6 self-configuration from router advertisements / running v4 and v6 together / carrying v6 across v4.
Single-mode vs multimode fiber: Long distance, narrow core, laser / shorter runs, larger core, cheaper optics.
Copper distance limit: 100 meters for Ethernet. Exceeding it causes attenuation.
SDN / SD-WAN / VXLAN: Central control separated from forwarding / that applied to WAN links / layer 2 extended across layer 3.
Zero trust / SASE / SSE: No implicit trust by location / networking and security delivered together from the cloud.
OSPF / EIGRP / RIP / BGP: Link state, cost / advanced distance vector / hop count, max 15 / path vector, between autonomous systems.
NAT vs PAT: Address translation / many private addresses to one public via ports. PAT is what most networks run.
FHRP: VRRP, HSRP. A virtual IP so hosts keep a gateway when a router fails.
802.1Q: VLAN tagging on trunk links. Access port = one VLAN untagged; trunk = several tagged.
Spanning Tree: Blocks redundant paths to prevent switching loops and broadcast storms.
LACP: Link aggregation: several physical links bonded into one logical link.
802.1X: Port-based access control. No traffic passes until authentication succeeds.
MTU / jumbo frames: 1500 bytes standard / around 9000. Must match end to end or fragmentation follows.
Non-overlapping 2.4 GHz channels: 1, 6 and 11.
WPA2 vs WPA3: AES-CCMP / adds SAE, resisting offline dictionary attacks on the handshake.
MDF vs IDF: Main distribution frame, where external circuits land / intermediate frames distributed through the building.
UPS vs PDU: Battery through outages and clean shutdown / power distribution within a rack.
EOL vs EOS: No longer sold / no longer patched. EOS is the security exposure.
RPO vs RTO: How much data you can lose (drives backup frequency) / how long you can be down (drives recovery design).
MTTR vs MTBF: Mean time to repair / mean time between failures.
Cold / warm / hot / active-active: Space and power / equipment but needs data / ready to run / both sites already carrying load.
Split vs full tunnel: Only corporate traffic through the VPN / everything through it.
SNMP / Syslog / flow data / packet capture: Polled metrics and traps / event messages / who talked to whom / the actual packets.
Port mirror vs tap: Switch copies traffic to a monitor port / a hardware device inserted in the link.
RADIUS vs TACACS+: Encrypts only the password, common for 802.1X and wireless / encrypts the whole payload, separates AAA, common for device admin.
ARP spoofing / MAC flooding / VLAN hopping: Forged ARP replies redirect traffic / overwhelms the MAC table so frames flood / reaches a VLAN it should not.
Evil twin / rogue DHCP: Malicious AP impersonating an SSID / unauthorized DHCP server handing out a hostile gateway.
DHCP snooping / dynamic ARP inspection: Blocks rogue DHCP / blocks ARP spoofing. Switch features that defeat those named attacks.
Seven-step methodology: Identify, theory, test theory, plan of action, implement or escalate, verify plus prevention, document.
Attenuation / crosstalk / EMI: Loss over distance / signal bleeding between pairs / outside interference. Fiber is immune to EMI.
Duplex mismatch: Link is up but performance is terrible, with collisions and late collisions rising.
OTDR / spectrum analyzer: Locates a fiber break by distance / identifies RF interference.

Common questions

CompTIA Network+ exam questions, answered

How many questions are on the CompTIA Network+ exam?

The CompTIA Network+ exam has 90 questions and lasts 90 minutes. CompTIA uses a scaled score rather than a published percentage, so there is no fixed pass mark to quote.

What is on the CompTIA Network+ exam?

The exam covers 5 domains: Networking Concepts (23%), Implementation (20%), Operations (19%), Security (14%), Troubleshooting (24%). These weightings come from CompTIA's N10-009 objectives v6.0.

Is this CompTIA Network+ material current?

Yes. This guide was written from CompTIA's own published outline, N10-009 objectives v6.0, and last checked against that document on 15 August 2026. That date is shown on every page so you can judge for yourself rather than take our word for it.

Are there free CompTIA Network+ practice questions?

Yes. Sample questions with full worked explanations are free and need no account. The complete question bank and the full-length 90-question timed mock are paid.

Practise it

The guide above is free. The question bank and the full-length timed mock are the paid part.

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