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Quizzes > Computers & IT

Network Fundamentals Quiz: Check Your Core Networking Skills

Quick, free networking basics quiz with instant results and explanations.

Editorial: Review CompletedCreated By: Maryam AbdoUpdated Aug 24, 2025
Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art displaying questions for Networking Fundamentals Quiz.

This quiz helps you review core network fundamentals like IP addressing, the OSI model, and subnetting. After you finish, explore related skills with a computer basics quiz, strengthen your security know‑how with a cyber security test, or check your broader tech knowledge with an it knowledge test.

Which OSI layer is responsible for end-to-end reliable delivery, sequencing, and flow control?
Transport layer
Data Link layer
Session layer
Network layer
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What does a switch primarily use to make forwarding decisions within a LAN?
Port number
MAC address
Protocol number
IP address
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Which protocol resolves an IPv4 address to a MAC address on a local network?
ICMP
ARP
DHCP
DNS
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Which TCP port is the default for HTTPS?
25
80
22
443
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What is the default subnet mask for a Class C IPv4 network?
255.255.255.0
255.0.0.0
255.255.255.252
255.255.0.0
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Which routing protocol uses link-state advertisements and forms areas to scale large networks?
RIP
EIGRP
BGP
OSPF
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What is the main function of NAT overload (PAT) on a border device?
To assign IP addresses via DHCP
To map many internal addresses to one public address using ports
To statically map a single private to a single public address
To encrypt IP packets end-to-end
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Which IPv6 address type is equivalent in purpose to IPv4 private addressing within a site?
Multicast (ff00::/8)
Link-local (fe80::/10)
Global unicast (2000::/3)
Unique local address (fc00::/7)
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What does VLAN tagging with IEEE 802.1Q insert into an Ethernet frame?
A 2-byte type field only
An 8-byte trailer with CRC
A 6-byte MAC extension
A 4-byte tag containing VLAN ID and priority
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Which spanning tree role is the switch that has all ports forwarding on the root path?
Designated bridge
Root bridge
Backup bridge
Non-designated bridge
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Which protocol and port are used by SNMP agents to send traps by default?
TCP 514
UDP 161
TCP 161
UDP 162
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Which IPSec mode encrypts only the payload of the IP packet, leaving the original IP header intact?
Transport mode
Main mode
Aggressive mode
Tunnel mode
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Which field in an IPv4 header is decremented by each router hop to prevent loops?
Header Length (IHL)
Flags
Fragment Offset
Time To Live (TTL)
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Which spanning tree variant provides faster convergence by replacing port states with roles?
PVST
MSTP
RSTP (802.1w)
STP (802.1D)
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Which routing protocol has a default administrative distance of 20 for external routes?
OSPF external type 2
Internal EIGRP
External EIGRP
BGP external
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Which BGP attribute is used by routers to prefer the highest value within a single AS when choosing best path?
AS Path
MED
Local Preference
Origin
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Which MPLS label operation removes the top label at the penultimate hop to optimize performance?
Label imposition
Label stacking
Penultimate hop popping
Label swap
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Which TCP congestion control phase increases the congestion window by one MSS per RTT after slow start ends?
Slow start
Fast recovery
Fast retransmit
Congestion avoidance
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Which syslog severity level corresponds to numerical value 0?
Critical
Alert
Error
Emergency
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Which SDN component maintains a global network view and programs forwarding devices via southbound APIs?
Data plane switch
Northbound application
SDN controller
Orchestration engine
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Learning Outcomes

  1. Identify key OSI and TCP/IP model layers.
  2. Analyse network addressing schemes including IP classes.
  3. Demonstrate understanding of switched and routed networks.
  4. Apply subnetting techniques to efficiently divide networks.
  5. Evaluate common network topologies and media types.
  6. Master basic troubleshooting methods for network issues.

Cheat Sheet

  1. Master the OSI and TCP/IP Models - Think of the OSI's seven layers as pizza toppings that must stack in order, while TCP/IP's four layers keep things lean and mean. Each layer handles a unique job, from framing bits to delivering web pages, so knowing them boosts your troubleshooting skills. Memorize "Please Do Not Throw Sausage Pizza Away" and you'll breeze through any network exam! OSI vs TCP/IP article
  2. Grasp IP Addressing and Subnetting - IP addresses are like street addresses for devices, split into a network "neighborhood" and a host "house." Subnetting carves big neighborhoods into cozy blocks, improving traffic flow and security. For example, a /24 mask gives you 256 addresses with 254 cozy host spots. IP Addressing & Subnetting
  3. Differentiate IP Address Classes - Classes A, B, and C range from tiny towns to sprawling cities, each with its own default mask and capacity. Class A can host millions of devices, while Class C supports up to 254 - pick wisely to fit your network's size. Understanding classes is like choosing the right venue for a party! Understanding IP Classes
  4. Learn Subnetting Techniques - Think of subnetting as slicing a pizza further by borrowing bits so each friend gets their own slice. Using a /26 mask on a Class C network yields four subnets with 62 device spots each - plenty for your gaming clan or home setup. Practice borrowing bits until it becomes second nature! Subnetting Techniques
  5. Understand Switched vs. Routed Networks - Switches are like smart traffic cops directing data within the same neighborhood, boosting speed and slashing collisions. Routers are highway masterminds, linking different neighborhoods and finding the best path for your packets. Knowing when to use each prevents network jams! Switched vs. Routed Networks
  6. Familiarize Yourself with Network Topologies - From star to mesh, topologies map device connections like city blueprints. A star layout is easy to troubleshoot thanks to its central hub, but that hub better stay functional! Mastering each design helps you build or debug networks with confidence. Network Topologies Explained
  7. Recognize Various Network Media Types - Whether you're wired in with Cat6 cables or surfing wireless waves on Wi-Fi, each medium brings its own perks. Fiber optics sprint at light speed over long distances while twisted-pair keeps costs down. Choose media that match your speed, range, and budget needs! Network Media Types
  8. Master Basic Network Troubleshooting - Tools like ping and traceroute are your detective kit for tracking connectivity gremlins. Use ipconfig or ifconfig to peek at your device's network setup and solve mysteries faster than Sherlock. Regular practice turns you into a network sleuth! Troubleshooting Toolkit
  9. Understand the Role of Protocols - Protocols are the rulebooks for data exchanges, from HTTP serving web pages to SMTP launching your emails. Each one lives on a specific OSI or TCP/IP layer, ensuring packets play by the right rules. Learn who does what to keep your data flowing smoothly! Key Networking Protocols
  10. Learn Network Security Fundamentals - Firewalls, HTTPS, and strong passwords act as your network's bodyguards against digital outlaws. Encryption scrambles info into secret codes, and authentication checks IDs at the door. Master these basics to keep your network secure and your mind at ease! Networking Security Basics
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