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Quizzes > Computers & Technology > Computers & IT

CompTIA Network+ Practice Quiz: Are You Ready to Ace It?

Think you can ace the Network+ practice test? Dive in!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
paper art illustration network quiz on coral background with cables routers chips question marks and certification medal icons

Ready to take your network certification prep to the next level? Our CompTIA Network+ Practice Quiz offers a comprehensive challenge to assess your networking fundamentals. This Network+ practice test simulates the official CompTIA N10-008 quiz with realistic CompTIA Network+ questions on IP addressing, subnetting, security, and wireless technologies. Whether you're a seasoned technician or new to IT, you'll receive instant feedback and clear explanations to guide your study. For targeted practice, explore network practice questions or take a timed net plus practice exam . Click "Start Quiz" now to boost your confidence and ace your certification journey!

Which OSI layer is responsible for logical addressing and routing?
Application Layer
Transport Layer
Network Layer
Data Link Layer
The Network layer handles logical addressing and routing of packets across network segments. It assigns IP addresses and determines the best path for data transmission. Layers above focus on application and session functions, while layers below deal with frames and physical signals. OSI Model layers explained
What is the default subnet mask for a Class C IPv4 network?
255.255.255.255
255.0.0.0
255.255.255.0
255.255.0.0
A Class C network has a default subnet mask of 255.255.255.0, which allows for 256 IP addresses per network. This mask provides 24 bits for the network portion and 8 bits for host addresses. Classful addressing is largely historical but still taught for foundational understanding. Subnet mask overview
Which protocol automatically assigns IP addresses to hosts on a network?
NAT
DNS
DHCP
FTP
DHCP (Dynamic Host Configuration Protocol) dynamically assigns IP addresses and other network configuration parameters to hosts. It simplifies IP management by leasing addresses from a pool instead of static assignment. DNS resolves domain names to IP addresses but does not assign them. Introduction to DHCP
Which device operates primarily at the OSI Data Link layer to forward frames based on MAC addresses?
Switch
Hub
Firewall
Router
Switches operate at the Data Link layer and use MAC address tables to forward frames to the correct port. Hubs work at the Physical layer and broadcast frames to all ports. Routers operate at the Network layer and direct packets between different networks. How network switches work
Which port number does DNS use by default for both TCP and UDP?
53
80
443
23
DNS uses port 53 for both UDP queries and TCP zone transfers. UDP is used for standard name resolution queries due to its lower overhead, while TCP handles larger transfers and zone synchronization. Ports 80 and 443 are used by HTTP and HTTPS respectively. IANA DNS port assignment
Which IP address range is used for Automatic Private IP Addressing (APIPA) in Windows when DHCP is unavailable?
10.0.0.0/8
169.254.0.0/16
192.168.0.0/16
172.16.0.0/12
APIPA assigns addresses in the 169.254.0.0/16 range when a DHCP server cannot be reached. It allows local host-to-host communication but not routing beyond the local network. This is a Windows feature to maintain limited connectivity. APIPA details
What wireless standard operates exclusively in the 5 GHz frequency band and supports speeds up to 1.3 Gbps?
802.11b
802.11ac
802.11n
802.11g
802.11ac operates only in the 5 GHz band and uses wider channels, up to 160 MHz, to deliver speeds as high as 1.3 Gbps or more. Earlier standards like 802.11n can use both 2.4 and 5 GHz but typically max out around 600 Mbps. 802.11b and g are slower and operate in 2.4 GHz only. 802.11ac overview
Which protocol encapsulates VLAN information in Ethernet frames for trunking between switches?
LACP
PPP
STP
802.1Q
802.1Q adds a VLAN tag to Ethernet frames, allowing multiple VLANs to traverse the same trunk link. STP prevents loops, LACP aggregates links, and PPP is a point-to-point protocol. The 802.1Q tag carries VLAN ID and priority information. Cisco on 802.1Q VLAN tagging
Which type of NAT allows multiple private IP addresses to be mapped to a single public IP address using different ports?
Dynamic NAT
PAT
Static NAT
SNAT
Port Address Translation (PAT) maps multiple private IPs to one public IP by assigning unique source port numbers. Static NAT creates a one-to-one mapping, and Dynamic NAT uses a pool of public IPs. PAT conserves public addresses by multiplexing ports. NAT overview by Cisco
Which command on a Cisco router displays the IP routing table?
show interfaces
show ip route
show running-config
show mac address-table
The 'show ip route' command lists all known routes in the IP routing table. It displays directly connected, static, and dynamic routes. Other commands show interface stats, running configurations, or MAC tables. Cisco guide to show ip route
What is the link-local prefix for IPv6 addresses?
2001::/32
FF02::/16
FE80::/10
FC00::/7
IPv6 link-local addresses begin with FE80::/10 and are used for communication on a single link. Unique Local Addresses use FC00::/7. FF02::/16 defines multicast addresses. Global unicast addresses often start with 2000::/3. RFC 4291 on IPv6 addressing
Which protocol is used for network management and monitoring and operates typically on UDP ports 161 and 162?
HTTP
SMTP
DHCP
SNMP
SNMP (Simple Network Management Protocol) uses UDP port 161 for queries and 162 for traps. It allows network administrators to monitor device status and configure settings remotely. SMTP is for email, HTTP for web traffic, and DHCP for address assignment. SNMP RFC 1157
What is the primary purpose of the Spanning Tree Protocol (STP) in a switched network?
Prevent switching loops
Route between VLANs
Manage switch power
Encrypt switch management traffic
STP prevents broadcast storms by creating a loop-free logical topology in Ethernet networks. It disables redundant links while maintaining backup paths. Without STP, switches could forward frames endlessly, causing network failure. Cisco STP fundamentals
Which protocol uses a three-way handshake to establish a connection?
IP
TCP
UDP
ICMP
TCP uses a three-way handshake (SYN, SYN-ACK, ACK) to establish reliable connections before data transfer. UDP is connectionless and does not handshake, ICMP handles network diagnostics, and IP is a network layer protocol without session management. TCP RFC 793
In OSPF, what is the purpose of a designated router (DR) on a broadcast network?
Encrypt OSPF updates
Translate routes to BGP
Perform NAT between segments
Reduce LSA flooding
The DR centralizes LSDB exchanges on multi-access networks, reducing the number of adjacencies and limiting LSA flooding. Other routers form adjacencies only with the DR and backup DR. This improves scalability and efficiency on networks with many OSPF speakers. Cisco OSPF technology overview
What is the default administrative distance of EIGRP internal routes on Cisco devices?
90
100
120
110
EIGRP's default administrative distance for internal routes is 90, making it more trusted than OSPF (110) and RIP (120). Administrative distance ranks the trustworthiness of route sources on Cisco routers. Lower values indicate more trusted routes. EIGRP administrative distance details
Which protocol uses a path vector mechanism to exchange routing information between autonomous systems?
RIP
BGP
EIGRP
OSPF
BGP uses a path vector protocol, exchanging full or incremental updates containing AS-path attributes. It maintains path lists to prevent routing loops and make policy-based decisions. RIP and OSPF are distance-vector and link-state protocols respectively. BGP RFC 4271
In an ACL on Cisco devices, what implicit rule applies at the end if no other matches are found?
implicit deny ip any any
no implicit rule
deny ip any any
permit ip any any
Cisco ACLs include an implicit 'deny ip any any' at the end, which blocks any traffic that doesn't match an earlier permit. This default rule ensures that only explicitly allowed traffic passes. Administrators must explicitly permit required traffic. Cisco implicit deny explanation
What is the primary purpose of a DMZ in network architecture?
Host public-facing services safely
Encrypt internal traffic only
Manage VLAN assignments
Replace firewall functionality
A DMZ (demilitarized zone) hosts public-facing services such as web and mail servers, isolating them from the internal network. It provides an additional security layer in case external hosts are compromised. Firewall rules tightly control traffic between DMZ, internal, and external zones. Understanding DMZ networks
Which MPLS component is responsible for assigning labels to routes at the network edge?
Label Edge Router (LER)
Customer Edge (CE) Router
Label Switch Router (LSR)
Provider (P) Router
The Label Edge Router (LER) assigns and removes MPLS labels at the edge of the provider network. LSRs in the core swap labels based on their forwarding tables. CE routers connect customer networks and do not handle MPLS labels. MPLS basics
Which of these technologies provides secure remote access via an encrypted tunnel at OSI layer 3?
SSL
SSH
IPsec
PPTP
IPsec operates at the Network layer and provides encryption and authentication for IP packets. SSL/TLS operates at the Transport layer for web traffic, SSH is an application layer protocol, and PPTP uses GRE at layer 2. IPsec is commonly used in VPNs. IPsec architecture RFC
When using IPv6 Stateless Address Autoconfiguration, which ICMPv6 message type does a host send to request prefix information?
Router Solicitation
Router Advertisement
Neighbor Advertisement
Neighbor Solicitation
During SLAAC, hosts send ICMPv6 Router Solicitation messages to prompt routers on the link to send Router Advertisements containing network prefix information. Routers respond with RA messages. Neighbor Solicitation/Advertisement are used for address resolution. RFC 4861 on Router Solicitation
In BGP route selection on Cisco devices, which attribute is considered first when multiple routes to the same prefix are available?
AS Path length
Local Preference
Weight
Multi-Exit Discriminator (MED)
On Cisco routers, the Weight attribute is the first criteria in BGP path selection and is local to the router. Higher weight routes are preferred. After weight, local preference and AS path length are considered. Weight is proprietary to Cisco. Cisco BGP path selection
Which QoS marking field in the Ethernet header is used in modern networks to classify traffic for priority queuing?
Class of Service (802.1p)
VLAN ID
MPLS EXP bits
DSCP
The 802.1p Class of Service field in the 802.1Q VLAN tag provides 3 bits for priority levels, allowing switches to queue frames accordingly. DSCP is in the IP header, VLAN ID identifies the VLAN, and MPLS EXP bits serve a similar role in MPLS. IEEE 802.1p specification
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Study Outcomes

  1. Analyze Network Topologies -

    Interpret different network layouts and protocol characteristics through realistic CompTIA Network+ practice questions to reinforce your design knowledge.

  2. Apply IP Addressing and Subnetting Techniques -

    Use quiz scenarios to calculate IP ranges and subnet masks, strengthening your ability to segment networks effectively for the N10-008 exam.

  3. Identify Troubleshooting Methodologies -

    Diagnose simulated network issues using common tools and step-by-step processes, building confidence in resolving real-world connectivity problems.

  4. Differentiate Networking Models -

    Match network functions to the appropriate OSI and TCP/IP layers, deepening your understanding of how each model supports data communication.

  5. Interpret Performance Metrics -

    Analyze your quiz scores and answer explanations to pinpoint strengths and weaknesses, guiding your future study efforts.

  6. Assess Certification Readiness -

    Evaluate your grasp of CompTIA Network+ concepts by reviewing detailed feedback and creating a targeted prep plan for the certification exam.

Cheat Sheet

  1. IP Addressing & Subnetting -

    Review IPv4 and IPv6 address structures, including network and host portions, as defined in RFC 791 and RFC 2460. Use the formula 2^(32 - mask length) - 2 to calculate hosts per subnet and practice slash notation (e.g., /24 = 256 addresses) following Cisco's CCNA curriculum. A handy mnemonic for remembering octet values is "128, 64, 32, 16, 8, 4, 2, 1."

  2. OSI & TCP/IP Models -

    Memorize the seven OSI layers and their functions using the ISO/IEC 7498 phrase "Please Do Not Throw Sausage Pizza Away" for Physical, Data Link, Network, Transport, Session, Presentation, and Application. Understand how these map to the four-layer TCP/IP suite used in modern networks per IETF standards. Knowing which protocols (e.g., IP at Network, TCP at Transport) operate at each layer is vital for pinpointing issues.

  3. Common Protocols & Ports -

    Familiarize yourself with standard TCP/UDP ports like 80 (HTTP), 443 (HTTPS), 21 (FTP), and 53 (DNS) as listed in IANA's registry. Review protocol functions - from DHCP automating IP assignments to SNMP monitoring devices - and reinforce memory using flashcards. For instance, DNS queries typically use UDP port 53 by default.

  4. Network Troubleshooting Tools -

    Practice using ping for basic connectivity checks (ICMP echo requests per RFC 792), traceroute for path analysis, and netstat for examining active connections. Remember that traceroute behavior varies by OS - Windows uses ICMP by default while Linux/Unix opts for UDP packets. Follow a consistent methodology like CompTIA's "Identify, Establish Theory, Test, Document" to stay organized.

  5. Ethernet & Wireless Standards -

    Study Ethernet frame structure and MAC addressing based on the IEEE 802.3 standard, including speeds like 10/100/1000 Mbps. Understand Wi-Fi standards 802.11a/b/g/n/ac/ax, their frequency bands, and throughput limits as published by the IEEE 802.11 working group. A quick way to remember wireless generations is by noting the alphabetic progression - each new letter usually brings higher speeds.

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