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Quizzes > Computers & Technology > Computers & IT

Take the Free Network Test Questions Quiz Now

Ready to tackle network + test questions? Challenge yourself now!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration showing network quiz theme with routers, switches, cables, question marks on coral background

Ready to supercharge your networking knowledge? Dive into our free network test questions challenge designed to reinforce key concepts, deliver instant feedback, and sharpen your troubleshooting skills. From tackling the notorious a.2.1 network pro domain: hardware question 3 of 24 to exploring extra network + test questions, this engaging quiz - built on insights from the nantel practice test series - provides a dynamic way to identify strengths, zero in on weak spots, and build confidence for exam day. Test your skills with this handpicked set of networks mcq questions or challenge yourself on practical network practice questions . Are you ready to level up? Start now and watch your certification prep soar!

Which OSI layer is responsible for logical addressing and routing?
Physical
Data Link
Network
Transport
The Network layer is responsible for logical addressing (such as IP addresses) and routing packets between networks. It determines the best path for data transfer across interconnected networks. Devices like routers operate at this layer. OSI Model
What is the default TCP port number for HTTP?
80
23
443
21
HTTP uses TCP port 80 by default for unencrypted web traffic. Secure HTTPS uses port 443. Telnet uses port 23 and FTP uses ports 20/21. Port Numbers
What is the default subnet mask for a Class C IPv4 network?
255.0.0.0
255.255.0.0
255.255.255.0
255.255.255.255
Class C IPv4 networks have a default subnet mask of 255.255.255.0, providing up to 254 usable host addresses. Class A uses 255.0.0.0, and Class B uses 255.255.0.0. IPv4 CIDR Notation
Which technology translates domain names into IP addresses?
DHCP
ARP
DNS
NAT
DNS (Domain Name System) resolves human-readable domain names into IP addresses so that applications can locate servers. DHCP assigns IP addresses to hosts. ARP resolves IP to MAC on local networks. DNS
What service dynamically assigns IP addresses to hosts on a network?
DNS
NAT
DHCP
FTP
DHCP (Dynamic Host Configuration Protocol) leases IP addresses, subnet masks, gateways, and DNS servers to hosts automatically. This reduces manual configuration errors. DHCP
At which layer of the OSI model is a frame defined?
Physical
Data Link
Network
Session
A frame is the PDU of the Data Link layer. It encapsulates network-layer packets with source/destination MAC addresses and error-checking fields. Network Frame
What protocol resolves IPv4 addresses to MAC addresses on a LAN?
DNS
ARP
ICMP
RARP
ARP (Address Resolution Protocol) maps IPv4 addresses to MAC addresses for local delivery. RARP does the reverse mapping and is largely obsolete. ARP
Which IPv4 address is the loopback address?
192.168.0.1
10.0.0.1
127.0.0.1
255.255.255.255
127.0.0.1 is the standard IPv4 loopback address used to test local TCP/IP stacks. Traffic to this address never leaves the host. Loopback Address
What device forwards traffic between different IP networks?
Switch
router
Hub
Bridge
Routers operate at the Network layer to forward packets between different IP networks based on routing tables. Switches and bridges operate at Layer 2. Router
Which metric does the ping utility use for testing reachability?
Throughput
Latency (RTT)
Jitter
Packet loss threshold
Ping uses ICMP echo requests and measures the round-trip time (RTT) to assess latency and reachability. Packet loss is a secondary metric. Ping
What is a MAC address?
Logical IP identifier
Physical hardware address
Subnet mask
Port number
A MAC address is a unique physical address burned into a network interface card at the Data Link layer. It identifies devices on a LAN. MAC Address
Which network topology features a central connection point to all devices?
Ring
Mesh
Star
Bus
In a star topology, all devices connect to a central hub or switch. It simplifies fault isolation but depends on the central device. Star Topology
What term describes simultaneous two-way communication?
Half-duplex
Simplex
Full-duplex
Unidirectional
Full-duplex allows data to be sent and received simultaneously on the same channel. Half-duplex only one direction at a time. Duplex Communication
Which device forwards frames based on MAC addresses?
Hub
Switch
Router
Modem
Switches build a MAC address table and forward frames only to the correct port. Hubs flood all ports. Switch
Which protocol is used by the ping tool?
TCP
UDP
ICMP
ARP
Ping uses the ICMP protocol to send echo requests and receive echo replies for network diagnostics. ICMP
What is the main difference between TCP and UDP?
TCP is connectionless, UDP is connection-oriented
TCP guarantees delivery, UDP does not
UDP uses flow control, TCP does not
UDP has three-way handshake, TCP does not
TCP provides reliable, ordered, and error-checked delivery through acknowledgments and retransmissions. UDP is connectionless and does not guarantee delivery. TCP vs UDP
How many usable host addresses are in a /24 subnet?
256
254
252
255
A /24 network has 256 total addresses; excluding the network and broadcast addresses yields 254 usable hosts. Subnet Hosts
What is the purpose of VLANs in a switched network?
Increase broadcast domains
Reduce collision domains
Segment networks logically
Assign IP addresses
VLANs segregate traffic at Layer 2 into separate broadcast domains, improving security and reducing unnecessary broadcast traffic. VLAN
Which technology allows multiple internal IP addresses to share one public IP?
DNS
NAT
DHCP
ARP
NAT (Network Address Translation) maps private IP addresses to a single public IP for Internet access, conserving address space. NAT
What does TTL in an IP packet header stand for and prevent?
Time To Live; prevents loops
Total Transfer Limit; prevents overload
Transmission Through Link; prevents fragmentation
Token Transmission Limit; prevents collisions
TTL (Time To Live) is decremented by each router hop to avoid packets looping indefinitely. A TTL of zero means the packet is discarded. TTL
Which protocol is used to monitor and manage network devices?
FTP
SNMP
SMTP
SSH
SNMP (Simple Network Management Protocol) collects and organizes information about managed devices and can change device configurations. SNMP
What is the purpose of an 802.1Q tag?
Authenticate switches
Provide link encryption
Mark VLAN membership in Ethernet frames
Compress Ethernet frames
802.1Q tags are inserted into Ethernet frames to identify VLAN membership across trunks between switches. 802.1Q
Which IP range is reserved for private networks?
172.32.0.0/16
192.0.2.0/24
10.0.0.0/8
224.0.0.0/4
10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 are reserved private ranges by RFC1918 and cannot be routed on the public Internet. Private Address Space
What attack involves falsifying ARP messages on a LAN?
Sybil attack
ARP poisoning
Smurf attack
DNS spoofing
ARP poisoning sends fake ARP replies to associate the attacker’s MAC address with another host’s IP, enabling man-in-the-middle attacks. ARP Spoofing
What is the range of well-known TCP/UDP port numbers?
0–1023
1024–49151
49152–65535
2048–4096
Ports 0–1023 are well-known ports assigned by IANA for common services like HTTP (80) and SSH (22). Registered ports are 1024–49151. Port Number Ranges
Which UDP port does DNS typically use for queries?
53
161
69
137
DNS uses UDP port 53 for standard queries due to its low overhead. TCP port 53 is used for zone transfers or responses exceeding UDP size. DNS Ports
What type of ICMP message does ping use to check connectivity?
Destination Unreachable
Echo Request and Echo Reply
Time Exceeded
Redirect
Ping sends ICMP Echo Request messages and waits for Echo Replies to verify reachability and measure round-trip time. ICMP Echo
Which addressing type sends data to all devices in a subnet?
Unicast
Broadcast
Multicast
Anycast
Broadcast addressing delivers packets to all hosts in a broadcast domain. Multicast targets subscribed groups. Broadcasting
Which layer in the TCP/IP model corresponds to the OSI Application, Presentation, and Session layers?
Transport
Application
Internet
Network Access
The TCP/IP Application layer encompasses OSI layers 5-7, handling high-level APIs, data representation, and session control. TCP/IP Model
Which tool lists each hop between your PC and a remote host?
ipconfig
netstat
traceroute
nslookup
Traceroute (or tracert in Windows) sends packets with increasing TTLs to identify each router hop along the path. Traceroute
How many subnets can you create with a /26 mask from a /24 network?
2
4
8
16
A /26 mask borrows 2 bits from the host portion of a /24. 2^2 = 4 subnets. Each subnet has 62 usable hosts. Subnetting
Which OSPF area type does not accept external routes and removes type 5 LSAs?
Not-so-stubby area (NSSA)
Standard area
Stub area
Backbone area
A stub area blocks type 5 LSAs (external routes) and relies on a default route to reach external destinations. NSSA allows limited external LSAs. OSPF Stub Area
In BGP path selection, which attribute has the highest priority?
AS Path length
Local Preference
MED
Origin type
Local Preference is evaluated before AS Path to determine the best outbound path. Higher local preference is preferred. BGP Path Selection
What QoS mechanism uses DSCP values in the IP header?
IntServ
DiffServ
MPLS TE
VPN
DiffServ marks packets with DSCP (Differentiated Services Code Point) for class-based forwarding behaviors. IntServ reserves resources per flow. DiffServ
What is a DLCI in Frame Relay?
Data Link Connection Identifier
Dynamic Link CID
Distributed LAN Channel Info
Digital Line Circuit Index
A DLCI identifies a virtual circuit on a Frame Relay network, used by switches to forward frames. Frame Relay DLCI
Which technology uses label switching to forward packets?
VPN
MPLS
GRE
NAT
MPLS forwards packets based on short labels rather than full network addresses, improving speed and enabling traffic engineering. MPLS
How is the STP root bridge elected?
Highest MAC address
Lowest priority then MAC
First switch for BPDU
Random selection
STP elects the root bridge by lowest bridge priority; ties are broken by lowest MAC address. The root acts as the reference point in the spanning tree. STP Root Bridge
What is the purpose of VRRP?
Encrypt routed traffic
Provide router redundancy
Manage virtual LANs
Translate IP addresses
VRRP (Virtual Router Redundancy Protocol) allows multiple routers to share a virtual IP for high availability. One router acts as master, others as backups. VRRP
Which protocol dynamically discovers network devices and builds a Layer 2 topology map?
LLDP
RIP
OSPF
EIGRP
LLDP (Link Layer Discovery Protocol) advertises identity and capabilities of directly connected devices. It builds topology maps at Layer 2. LLDP
In an ACL, what is the effect of an implicit deny?
Allows all unspecified traffic
Drops traffic not explicitly permitted
Logs and forwards traffic
Redirects traffic to admin
ACLs have an implicit deny at the end of the rule set, so any traffic not matched by a permit statement is denied by default. ACL
What distinguishes NAT overload (PAT) from static NAT?
PAT uses one-to-one mapping
PAT uses port translation for many-to-one
Static NAT is dynamic
Static NAT uses port numbers
PAT (Port Address Translation) maps multiple private IPs to a single public IP using unique port numbers. Static NAT maps one private IP to one public IP consistently. PAT
How many bits are in an IPv6 address?
64
128
32
256
IPv6 addresses are 128 bits long, expressed in eight 16-bit hexadecimal groups. This expanded space resolves IPv4 exhaustion. IPv6 Address
What protocol negotiates EtherChannel links between switches?
LACP
RSTP
HSRP
GLBP
LACP (Link Aggregation Control Protocol) dynamically negotiates and manages link aggregation groups between capable devices. LACP
What is the typical MTU size for Ethernet without jumbo frames?
1500 bytes
9000 bytes
512 bytes
2048 bytes
Standard Ethernet frames have an MTU of 1500 bytes. Jumbo frames extend this limit, commonly up to 9000 bytes. MTU
In IPv4 fragmentation, which field indicates the fragment offset?
Identification
Flags
Fragment Offset
Time To Live
The Fragment Offset field specifies where this fragment belongs in the original datagram and is measured in 8-byte units. IPv4 Header
Which BGP extension allows the exchange of IPv6 routing information over an IPv4 session?
MP-BGP
iBGP
eBGP
BGP-4
MP-BGP (Multiprotocol BGP) extends BGP-4 to carry routing information for multiple network layer protocols, including IPv6, over an existing session. RFC 4760
What is the primary benefit of separating the control plane and data plane in SDN architectures?
Improved encryption
Centralized network management
Higher physical security
Increased collision domains
Separating control and data planes in SDN centralizes decision-making in controllers and simplifies network management and policy enforcement. SDN
Which technology encapsulates Ethernet frames in an overlay network using VXLAN?
MPLS
VXLAN uses UDP encapsulation
GRE uses TCP
L2TP uses SCTP
VXLAN encapsulates Layer 2 Ethernet frames in UDP packets with a 24-bit VNID, enabling large-scale overlay networks. VXLAN
What mechanism does MPLS use to steer traffic along predefined paths for TE?
LDP
RSVP-TE
BGP
STP
RSVP-TE (Resource Reservation Protocol-Traffic Engineering) signals and reserves resources to establish MPLS TE tunnels along specific network paths. RSVP-TE
In DiffServ, what does AF41 represent in terms of DSCP value?
001000 (8)
101000 (40)
111000 (56)
100000 (32)
AF41 is one of the Assured Forwarding classes, encoded as DSCP decimal 34 (binary 100010); but AF41 marker uses decimal 40 (binary 101000). RFC 2597
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Study Outcomes

  1. Understand Core Networking Protocols -

    Use network test questions to reinforce your knowledge of TCP/IP, UDP, and other essential protocols within the OSI and TCP/IP models.

  2. Identify Network Hardware Components -

    Recognize and describe key devices such as routers, switches, and hubs, including hardware specifics from a.2.1 network pro domain: hardware question 3 of 24.

  3. Differentiate OSI Model Layers -

    Distinguish functions and services of each OSI layer using targeted network + test questions for clear conceptual mapping.

  4. Apply Troubleshooting Techniques -

    Practice diagnostic workflows to resolve connectivity issues and configuration errors encountered in real-world networking scenarios.

  5. Evaluate Your Performance -

    Analyze results from the free nantel practice test to identify strengths, weaknesses, and areas needing further study.

  6. Boost Certification Readiness -

    Leverage instant feedback from network test questions to fine-tune your study plan and improve exam confidence.

Cheat Sheet

  1. OSI Model Layers -

    Master the seven OSI layers with the mnemonic "Please Do Not Throw Sausage Pizza Away" to recall Physical through Application quickly. Cisco's certification guides emphasize how identifying a layer's function - like encryption at Layer 6 - can help you nail network test questions.

  2. TCP vs UDP Protocols -

    Remember that TCP is connection-oriented and guarantees delivery, while UDP is faster but unreliable - ideal for streaming. Keep port examples in mind (e.g., TCP 80 for HTTP, UDP 53 for DNS) when tackling network + test questions.

  3. Subnetting Fundamentals -

    Use the formula 2^n - 2 to calculate host addresses per subnet and practice with CIDR notation (e.g., /24 gives 256 addresses, 254 usable). Hands-on drills from a nantel practice test will build your speed for certification quizzes.

  4. Ethernet Frame Structure -

    Review the preamble, Start Frame Delimiter, MAC address fields, EtherType, payload, and FCS to spot errors at Layer 2. IEEE 802.3 standards explain how a single-bit mismatch in the FCS can drop a frame, a common scenario in network test questions.

  5. Hardware Device Roles -

    Differentiate hubs (Layer 1), switches (Layer 2), and routers (Layer 3) to answer a.2.1 network pro domain: hardware question 3 of 24 with confidence. Understanding NAT on a router versus MAC filtering on a switch is a classic focus of network + practice challenges.

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