Practice for the CCNA exam with 23 exam-style practice questions, instant answer reveals, and concise explanations of every correct answer. Topics include: Refer to the exhibit. Which switch becomes the root bridge for VLAN 20 if all switches use the default bridge priority a. Follow @CertPunch and visit certpunch.com for more certification practice exams and study content.
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What you will practice
- Refer to the exhibit. Which switch becomes the root bridge for VLAN 20 if all switches use the default bridge…
- Refer to the exhibit. Between which zones do wireless users expect to experience intermittent connectivity?
- Refer to the exhibit. Traffic from R1 to the 10.10.2.0/24 subnet uses 192.168.1.2 as its next hop. A network…
- Refer to the exhibit. The switch cat9k-acc-1 connects users to the campus LAN. Printing services are inaccess…
- Refer to the exhibit. What does the exhibit show R1 doing with the DSCP values of the packets?
- Refer to the exhibit. Traffic that is flowing over interface TenGigabitEthernet0/0/0 experiences slow transfe…
Answers and explanations
Tap a question to expand the answer and the exam reasoning. Try to commit to your own pick first.
Q1. Refer to the exhibit. Which switch becomes the root bridge for VLAN 20 if all switches use the default bridge priority and SW1 has the lowest MAC address?
Answer: A. A. SW1
Spanning Tree Protocol elects the root bridge based on the lowest bridge ID, which combines the priority and the MAC address. When all priorities are equal, the switch with the lowest MAC address becomes the root bridge.
Q2. Refer to the exhibit. Between which zones do wireless users expect to experience intermittent connectivity?
Answer: C. C. between zones 3 and 4
Overlapping coverage cells operating on the same channel cause co-channel interference, forcing devices to share the RF medium and increasing contention. Identifying overlapping channels in the exhibit pinpoints where users experience unstable connections.
Q3. Refer to the exhibit. Traffic from R1 to the 10.10.2.0/24 subnet uses 192.168.1.2 as its next hop. A network engineer wants to update the R1 configuration so that traffic with destination 10.10.2.1 passes through router R3, and all other t…
Answer: A. A. ip route 10.10.2.1 255.255.255.255 192.168.1.4 115
The longest prefix match rule dictates that routers always prefer the most specific route. Configuring a host route with a slash thirty two mask ensures traffic for that single IP uses the new path, while the rest of the subnet uses the broader route.
Q4. Refer to the exhibit. The switch cat9k-acc-1 connects users to the campus LAN. Printing services are inaccessible through the network. Which interface issue is causing the connectivity problems?
Answer: A. A. A bad checksum is causing Ethernet frames to drop.
A high number of CRC errors indicates that Ethernet frames are arriving corrupted and failing the checksum verification. Excessive collisions or broadcast packets would show different interface counters, while output queue drops would not specifically generate CRC errors.
Q5. Refer to the exhibit. What does the exhibit show R1 doing with the DSCP values of the packets?
Answer: A. A. preserving the DSCP markings
The exhibit demonstrates that R1 is preserving the existing DSCP markings because the packets exit with the exact same values they entered with. Remarking, shaping, or queuing would actively alter or restrict the traffic flow, which is not shown here.
Q6. Refer to the exhibit. Traffic that is flowing over interface TenGigabitEthernet0/0/0 experiences slow transfer speeds. What is the cause of this issue?
Answer: C. C. duplex incompatibility
A massive collision count on a full-duplex interface is the classic symptom of a duplex incompatibility between connected devices. Queuing drops or congestion would show output drops, while a speed conflict typically results in a downed line protocol.
Q7. Refer to the exhibit. An engineer wants the EtherChannel to go down unless at least two links are active. Which configuration on Switch1 meets this requirement?
Answer: B. Switch1(config-if)# port-channel min-links 2
The port-channel min-links command forces the EtherChannel interface to down state if active member links drop below the threshold. LACP port-priority only controls which links are placed in standby, while max-bundle limits the total active links allowed.
Q8. Refer to the exhibit. A Cisco WLC administrator is creating a new wireless network with enhanced SSID security. The new network must operate at 2.4 GHz with 54 Mbps of throughput. Which set of tasks must the administrator perform to comple…
Answer: C. C. Uncheck the Broadcast SSID check box and set the Radio Policy to 802.11g only.
The 802.11g standard operates in the 2.4 GHz band and provides up to 54 Mbps throughput. Enhanced SSID security implies hiding the network, so unchecking Broadcast SSID fulfills this requirement while the radio policy enforces the correct frequency and speed.
Q9. Refer to the exhibit. Which action establishes the OSPF neighbor relationship by allowing the routers to form an adjacency?
Answer: A. A. modify hello interval
OSPF requires neighboring routers to have matching Hello and Dead timers to form an adjacency. Modifying the hello interval resolves the timer mismatch shown in the exhibit, allowing the routers to successfully synchronize their link-state databases.
Q10. Refer to the exhibit. If the network environment is operating normally, which type of device must be connected to interface fastethernet 0/1?
Answer: C. C. router
Configuring an interface with IP ARP inspection trust designates it as a trusted port for Dynamic ARP Inspection. Trusted ports are typically used for uplinks connecting to other routers or switches, preventing legitimate traffic from being dropped.
Q11. Refer to the exhibit. Router R14 is in the process of being configured. Which configuration must be used to establish a host route to PC 10?
Answer: B. B. ip route 10.80.65.10 255.255.255.255 10.73.65.66
A host route requires a 255.255.255.255 subnet mask. Options using wildcard masks or broader masks fail to create a single-host entry. The next hop must be on a connected subnet.
Q12. Refer to the exhibit. An administrator received a call from a branch office regarding poor application performance hosted at the headquarters. Ethernet 1 is connected between Router1 and the LAN switch. What identifies the issue?
Answer: B. B. There is a duplex mismatch.
A high collision count combined with CRC errors indicates a duplex mismatch. Modern switched Ethernet operates in full-duplex, meaning collisions should not occur under normal operation.
Q13. Refer to the exhibit. A network administrator assumes a task to complete the connectivity between PC A and the File Server. Switch A and Switch B have been partially configured with VLANs 10, 11, 12, and 13. What is the next step in the co…
Answer: B. B. Add VLAN 13 to the trunk links on Switch A and Switch B for VLAN propagation
Trunk links must explicitly allow specific VLANs to carry their traffic across switches. If a trunk omits a VLAN, frames assigned to it will not cross the link.
Q14. Refer to the exhibit. To which device does Router1 send packets that are destined to host 10.10.13.165?
Answer: B. B. Router3
Routers use the longest-prefix match to determine the best path. The destination IP falls within the specific subnet associated with Router3.
Q15. Refer to the exhibit. What is represented by R1 and SW1 within the JSON output?
Answer: B. B. value
In JSON, strings inside arrays act as values mapped to their respective keys. Keys map to arrays, while the items inside those arrays are the values.
Q16. Refer to the exhibit. Which configuration issue is preventing the OSPF neighbor relationship from being established between the two routers?
Answer: C. C. R1 interface Gi1/0 has a larger MTU size.
OSPF neighbors must have matching interface maximum transmission unit sizes. An MTU mismatch prevents adjacency from reaching the full state.
Q17. Refer to the exhibit. What is the effect of this configuration?
Answer: C. C. The switch port interface trust state becomes untrusted.
Dynamic ARP inspection treats switch ports as untrusted by default. Without an explicit trust command, the interface remains untrusted.
Q18. Refer to the exhibit. What is the next hop for traffic entering R1 with a destination of 10.1.2.126?
Answer: A. A. 10.165.20.126
The destination IP falls within the 10.1.2.0/25 subnet. The routing table identifies this subnet with an EIGRP route via the specified next hop. Longest-prefix match dictates that this route is chosen over any less specific entries.
Q19. Refer to the exhibit. A packet sourced from 172.16.32.254 is destined for 172.16.32.8. What is the subnet mask of the preferred destination route?
Answer: C. C. 255.255.255.192
The destination IP falls within the 172.16.32.0/26 subnet, which corresponds to a 255.255.255.192 subnet mask. The longest-prefix match rule selects this route because it is the most specific matching entry in the routing table.
Q20. Refer to the exhibit. A network engineer updates the existing configuration on interface FastEthernet1/1 on switch SW1. It must establish an EtherChannel by using the same group designation with another vendor switch. Which configuration m…
Answer: C. C. interface fastethernet 1/1 channel-group 2 mode active
Connecting to a non-Cisco switch requires a standards-based protocol like LACP. The command channel-group mode active explicitly enables LACP negotiation on the physical interface. Proprietary protocols like PAgP will fail with third-party hardware.
Q21. Refer to the exhibit. Load-balanced traffic is coming in from the WAN destined to a host at 172.16.1.190. Which next-hop IP address is used by the router to forward the request?
Answer: C. C. 192.168.7.35
The destination address belongs to the 172.16.1.184/29 subnet. According to the routing table, this specific prefix is reachable via the selected next-hop address. Longest-prefix match ensures the router chooses this exact route over broader network summaries.
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