Cisco CCNA
15 free questions with worked answers, and 149 more in the full bank.
Free questions
A junior technician notices collisions on an interface connected to a legacy hub. Which duplex setting is most likely causing this issue?
1 mark · Easy
After replacing a PC, the switchport logs show a continuous flapping of MAC addresses. What is the most probable reason for this behavior?
3 marks · Medium
An engineer analyzes a packet capture and observes ARP replies arriving without corresponding ARP requests. This behavior is indicative of what process or attack?
4 marks · Hard
Users complain of slow performance. An interface shows late collisions and CRC errors. What is the standard troubleshooting step for this symptom?
3 marks · Medium
A router needs to forward a packet but its ARP cache is empty for the destination IP on a directly connected subnet. What does the router do next?
1 mark · Easy
A router has three routes to 10.1.1.0/24: an OSPF route, an EIGRP route, and a Static route. Which route will be installed in the routing table?
1 mark · Easy
A packet is destined for 192.168.1.130. The routing table has 192.168.1.0/24 (AD 110) and 192.168.1.128/26 (AD 120). Which path does the router choose?
3 marks · Medium
A technician configures a floating static route as a backup to an EIGRP learned route for branch office connectivity. What is the necessary configuration step?
4 marks · Hard
Looking at the `show ip route` output, you see a route marked with a "D". What routing protocol generated this entry?
3 marks · Medium
You need to route traffic to the internet but do not have a specific route in the routing table. What kind of route should be configured?
1 mark · Easy
An admin notices a routing loop forming between three routers running RIPv2. Which mechanism prevents routing loops by not advertising a route back on the interface it was learned from?
3 marks · Medium
A multi-access OSPF network needs to elect a DR and BDR. Which router attribute is evaluated first to determine the DR?
1 mark · Easy
Two OSPF routers are connected over a point-to-point link. One router is stuck in the EXSTART state. What is the most likely cause of this issue?
3 marks · Medium
A network architect is designing a multi-area OSPF network. What is the strict requirement regarding Area 0?
4 marks · Hard
A technician is analyzing OSPF LSAs. Which LSA type is used by an ABR to advertise routes between different areas?
3 marks · Medium
More Cisco CCNA questions (page 3 of 3)
Answers and explanations are in the full bank.
- During a workshop assessment, the reported condition is: Two OSPF routers on the same Ethernet subnet do not become neighbors because their area IDs differ. What correction is required? · 3 marks
- During a workshop assessment, the reported condition is: A branch router needs a route for all unknown destinations through 192.0.2.1. Which static route represents that intent? · 1 mark
- During a workshop assessment, the reported condition is: An ACL permits web traffic but omits an explicit final permit for other required traffic. What happens to unmatched packets? · 3 marks
- During a workshop assessment, the reported condition is: A standard IPv4 ACL is intended to block one source from reaching a particular server without affecting that source's other destinations. Where is it generally placed? · 1 mark
- During a workshop assessment, the reported condition is: Inside clients have private addresses, and many sessions must share one public interface address. Which translation method fits? · 3 marks
- During a workshop assessment, the reported condition is: Clients on a VLAN cannot reach a DHCP server across the router. Which interface configuration is normally needed? · 1 mark
- During a workshop assessment, the reported condition is: Router logs cannot be correlated because its clock differs from all other devices. Which service should be configured and verified? · 3 marks
- During a workshop assessment, the reported condition is: Remote management currently uses Telnet with shared credentials. Which improvement is appropriate? · 1 mark
- During a workshop assessment, the reported condition is: An automation script sends malformed JSON to a Cisco REST API and receives an HTTP 400 response. What should be corrected? · 3 marks
- A supervisor tests your knowledge of router. Which answer is best? · 3 marks
- A supervisor tests your knowledge of switch access port. Which answer is best? · 4 marks
- A supervisor tests your knowledge of Cisco IOS longest-prefix matching. Which answer is best? · 4 marks
- A supervisor tests your knowledge of ip helper-address. Which answer is best? · 4 marks
- A supervisor tests your knowledge of standard IPv4 ACL. Which answer is best? · 1 mark
- A supervisor tests your knowledge of controller-based networking. Which answer is best? · 1 mark
- A certification question asks about Layer 2 switch. Which answer is correct? · 3 marks
- A certification question asks about 802.1Q trunk. Which answer is correct? · 3 marks
- A certification question asks about connected route administrative distance. Which answer is correct? · 3 marks
- During routine technical work, which statement about the IPv6 2000::/3 range should guide the technician? · 3 marks
- CCNA addressing case CC4-N1 configures 172.20.30.10/24. Which network appears as directly connected? · 1 mark
- CCNA subnet case CC4-B1 uses 172.20.30.10/24. What directed broadcast address belongs to this subnet? · 1 mark
- CCNA ACL case CC4-W1 must match subnet 172.20.30.0/24. Which wildcard mask corresponds to 255.255.255.0? · 1 mark
- Using the classic 100 Mbps reference bandwidth, CCNA case CC4-O1 examines a 10 Mbps interface. What integer OSPF cost is used by reference/bandwidth with a minimum of 1? · 1 mark
- EtherChannel case CC4-E1 bundles 2 links rated 1 Gbps each. What aggregate theoretical member capacity is available in one direction before overhead? · 1 mark
- Switch plan CC4-V1 assigns 8 access ports to each of 3 user VLANs. How many access ports are allocated in total? · 1 mark
- PAT estimate CC4-P1 has 20 inside hosts averaging 4 simultaneous translated sessions each. How many translations should capacity planning expect? · 1 mark
- ACL planning CC4-A1 matches 172.20.30.0/24 with wildcard 0.0.0.255. How many IPv4 addresses are included in that match? · 1 mark
- IPv6 design CC4-I1 divides a /48 allocation into /64 LANs. How many /64 subnets are available? · 1 mark
- Routing case CC4-L1 lists 10.0.0.0/8, 10.100.0.0/16, and 10.100.50.0/24. Which route forwards destination 10.100.50.9? · 1 mark