Quiz

CCENT Quiz 3: Networking Fundamentals Assessment

Test foundational Cisco networking knowledge with 10 untimed CCENT practice questions covering switching, routing, IPv4, OSI, TCP/IP, and troubleshooting.

How to Use This Quiz

This is Quiz 3 in a broader CCENT practice sequence. It contains 10 multiple-choice questions numbered 11 through 20. The assessment is untimed, so start when ready and return later if needed.

Record one answer for each question before checking the review section. After completion, compare your answers with the correct answers, calculate your final score, and read the explanation for every response, including incorrect responses.

1. Choose the best answer for questions 11 through 20.
2. Give yourself one point for each correct answer.
3. Calculate your score as correct answers ÷ 10 × 100.
4. Review the explanations and revisit any topic you missed.

For additional practice, see CCENT Quiz 2 and CCENT Quiz 4.

Questions 11–20

Question 11: Local and Remote Packet Delivery

A workstation has IP address 192.168.10.25/24 and default gateway 192.168.10.1. It must send traffic to 192.168.20.50. Which device receives the initial Ethernet frame from the workstation?

1. The destination workstation at 192.168.20.50
2. The default gateway at 192.168.10.1
3. The DNS server
4. The nearest wireless access point as the Layer 3 destination

Question 12: Protocol Data Units and Layers

Which statement correctly identifies the protocol data unit created by TCP and the device that primarily makes forwarding decisions using destination IP addresses?

1. TCP creates a frame, and a switch uses destination IP addresses.
2. TCP creates a segment, and a router uses destination IP addresses.
3. TCP creates a bit, and a firewall uses source MAC addresses only.
4. TCP creates a packet, and an access point uses routing tables.

Question 13: Switch MAC Learning

A switch receives a unicast Ethernet frame whose destination MAC address is not in its MAC address table. What does the switch normally do?

1. Discard the frame immediately
2. Forward the frame only through the port where the source was learned
3. Flood the frame out all appropriate ports except the ingress port
4. Send the frame to the router for IP resolution

Question 14: IPv4 Subnetting

For the address 192.168.10.70 with subnet mask 255.255.255.192 (/26), which combination is correct?

1. Network: 192.168.10.0; usable hosts: .1–.62; broadcast: 192.168.10.63
2. Network: 192.168.10.64; usable hosts: .65–.126; broadcast: 192.168.10.127
3. Network: 192.168.10.70; usable hosts: .71–.126; broadcast: 192.168.10.127
4. Network: 192.168.10.128; usable hosts: .129–.190; broadcast: 192.168.10.191

Question 15: Routing-Table Selection

A router has these routes:

10.0.0.0/8 via 192.0.2.1
10.20.0.0/16 via 192.0.2.2
0.0.0.0/0 via 192.0.2.254

Which next hop is selected for a packet destined for 10.20.5.8?

1. 192.0.2.1, because the /8 route appears first
2. 192.0.2.2, because the /16 route is more specific
3. 192.0.2.254, because every remote packet uses the default route
4. No next hop, because the destination is not directly connected

Question 16: TCP and UDP

Which statement best compares TCP and UDP?

1. TCP is connectionless, while UDP uses acknowledgments and sequencing.
2. TCP provides reliability, sequencing, acknowledgments, and flow control; UDP has lower overhead and does not establish the same connection.
3. TCP is used only for local networks, while UDP is used only for WANs.
4. UDP always delivers data faster and more reliably than TCP.

Question 17: Network Types, Devices, and Topology

Which statement is correct?

1. A LAN connects geographically separated cities, and a WAN connects devices in one room.
2. A switch routes between IP networks, while a router learns only MAC addresses.
3. A wireless access point provides wireless Layer 2 access, a router connects different IP networks, and a firewall applies traffic-control rules.
4. A physical topology describes IP addressing, while a logical topology describes cable placement.

Question 18: Default-Gateway Troubleshooting

A host can communicate with devices on its own subnet but cannot reach any device outside that subnet. Which check is the best next step?

1. Check the host's IP address, subnet mask, and default gateway, then test the gateway.
2. Replace the DNS server before testing IP connectivity.
3. Clear the switch MAC address table first.
4. Change the host's MAC address.

Question 19: Name Resolution

A host can ping 8.8.8.8 but cannot open a site by hostname. What is the most likely fault domain?

1. The Ethernet collision domain
2. DNS configuration or name resolution
3. The host's subnet mask in every case
4. The router's directly connected route

Question 20: Ethernet Domains and Duplex

Which statement is accurate about Ethernet switching?

1. A switch creates one collision domain and one broadcast domain for every entire network.
2. Each active switch port normally represents a separate collision domain, while broadcasts remain in the same broadcast domain unless separated by a Layer 3 device or other segmentation.
3. Half-duplex operation eliminates collisions through acknowledgments.
4. Multicast traffic is always identical to a Layer 2 broadcast.

Answer Review and Scoring

Use the learner-answer column to record your selection. A unicast frame targets one destination, a broadcast targets all devices in the broadcast domain, and multicast targets a subscribed group. A switch forwards known destinations, filters frames that belong on the incoming port, and floods unknown unicast and broadcast frames as appropriate.

Final score: ______ / 10 = ______%

OSI and TCP/IP Reference

Data is commonly called bits at Layer 1, a frame at Layer 2, a packet at Layer 3, and a segment for TCP at Layer 4. UDP commonly uses the term datagram.

IPv4 Subnetting Reference

The first address in a subnet is the network address, the last is the broadcast address, and the addresses between them are normally assignable to hosts. Common private IPv4 ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Public addresses are generally routable on the Internet. A default gateway is the local router address used for destinations outside the host's subnet.

TCP and UDP Comparison

Basic Verification Commands

Use a structured troubleshooting order: define the symptom, check the physical and interface status, verify local IP settings, test the local stack, test the gateway, test a remote IP address, and finally test hostname resolution.

• Windows: ipconfig /all displays the IPv4 address, subnet mask, gateway, DNS settings, and DHCP information.
• Windows, Linux, or Cisco IOS: ping <destination> tests basic IP reachability.
• Windows: tracert <destination>; Linux: traceroute <destination> shows the path toward a destination.
• Cisco IOS: show ip interface brief verifies interface addresses and operational status.
• Cisco IOS: show ip route displays connected, static, learned, and default routes.
• Cisco IOS: show mac address-table shows learned MAC addresses and associated switch ports.

Key Exam Notes

• Switching uses local MAC addresses and frames; routing uses logical IP addresses and packets.
• A default route, written as 0.0.0.0/0 for IPv4, is used when no more-specific route matches.
• Source and destination ports identify applications at the transport layer. The source port is typically selected by the client, while the destination port identifies the requested service.
• Wireless access points provide network access but are not automatically routers. Firewalls enforce traffic policies and may operate across multiple layers.
• Physical and logical topologies can differ: devices may be physically connected in one arrangement while traffic logically follows VLAN, routing, or wireless associations.