CCNA Network Infrastructure and Connectivity Practice Test 4 — 15 Questions

Question 1

Drag and drop the following steps into the correct order to replace a faulty SFP on a Cisco switch and verify the fiber link.

Accepted Answer

Physically replace the SFP, then connect the cable, and finally verify the link and check for errors.. The only correct sequence is to physically replace the SFP first, then connect the fiber cable, and finally verify the link and check for errors. Option A correctly follows this order. Option B incorrectly connects the cable before replacing the SFP, which risks damaging the connector. Option C verifies the link before making any change, which is pointless. Option D connects the cable then verifies before replacing the SFP, which is illogical. Therefore, only option A is correct.

Answer

Connect the cable, then physically replace the SFP, and finally verify the link and check for errors.

Answer

Verify the link and check for errors, then physically replace the SFP, and finally connect the cable.

Answer

Connect the cable, then verify the link and check for errors, and finally physically replace the SFP.

Question 2

Drag and drop the following steps into the correct order to replace a faulty SFP module on a Cisco switch and verify the fiber interface.

Accepted Answer

Disconnect the fiber cable from the SFP module.. The correct SFP replacement procedure ends with verification of the interface (e.g., using 'show interfaces'), but the given options only cover disconnecting the cable, removing the module, inserting the new module, and reconnecting the cable. The explanation mentions verification but no corresponding option exists, making the question internally inconsistent.

Question 3

Drag and drop the following steps into the correct order to install a new fiber optic cable, insert the SFP, and verify the link on a Cisco switch.

Accepted Answer

Install the SFP module into the switch port.. The correct sequence is to first install the SFP module (A), then attach the fiber optic cable to the SFP (B), then verify the link status using 'show interfaces' (C), and finally check for errors using 'show interfaces counters errors' (D). All four steps are required in this order.

Question 4

Drag and drop the cable types on the left to the correct maximum distance or connector type on the right.
PAIRS:
  Cat5e  →  100 meters (max distance)
  Cat6a  →  100 meters (max distance)
  Single-mode fiber  →  LC connector
  Multimode fiber (OM3)  →  300 meters (max distance at 10 Gbps)
  Coaxial cable (RG-6)  →  F-type connector

Accepted Answer

Cat5e: Maximum distance of 100 meters for Ethernet.. The correct pairing from the list is Cat5e to 100 meters. Option A correctly states this. Option B is incorrect because Cat6 supports 10GBASE-T only up to 55 meters, not 100 meters. Option C is true about single-mode fiber in general, but the prompt pairs single-mode fiber with LC connector, not distance. Option D is incorrect because OM3 multimode fiber supports 300 meters at 10 Gbps, not 550 meters.

Answer

Cat6: Maximum distance of 100 meters for 10GBASE-T (up to 55 meters for 10 Gbps).

Answer

Fiber optic single-mode: Maximum distance of 40 km or more with laser-based transceivers.

Answer

Fiber optic multi-mode: Maximum distance of 550 meters for 10GBASE-SR.

Question 5

Drag and drop the following steps into the correct order to describe the TCP three-way handshake between a client and a server.

Accepted Answer

Client sends SYN to server. The TCP three-way handshake begins with the client sending a SYN to the server. The server responds with a SYN-ACK, which combines the acknowledgment of the client's SYN with its own SYN. Finally, the client sends an ACK to acknowledge the server's SYN. Option D is incorrect because the server never sends a standalone ACK; its ACK is always combined with its SYN.

Answer

Server sends ACK to client

Question 6

Drag and drop the following steps into the correct order to sequence the TCP three-way handshake between a client and server.

Accepted Answer

Client sends SYN to server. The TCP three-way handshake consists of exactly three steps: (1) Client sends SYN to initiate the connection, (2) Server responds with SYN-ACK to acknowledge and synchronize, and (3) Client sends ACK to acknowledge the server's SYN. Option D (Client sends SYN-ACK) is not part of the three-way handshake; the client never sends a SYN-ACK. Therefore, the correct sequence is A → B → C, and D is incorrect.

Answer

Client sends SYN-ACK to server

Question 7

Drag and drop the following steps into the correct order to replace a faulty SFP on a Cisco switch and verify the fiber link.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

PC sends SYN to server (192.168.2.20). The TCP three-way handshake consists of three steps: SYN (client to server), SYN-ACK (server to client), and ACK (client to server). The fourth step (server ACK) is not part of the standard handshake. The correct order is A, B, C, with D omitted.

Answer

Server sends ACK to PC (192.168.1.10)

Question 8

Drag and drop the following steps into the correct order to describe the ARP resolution process when a host needs to send data to another host on the same Ethernet network.

Accepted Answer

Check ARP cache for the destination IP address. ARP resolution begins with checking the cache (step A). If no entry exists, the source broadcasts an ARP request (step B). The destination host responds with a unicast ARP reply containing its MAC address (step C). Finally, the source updates its cache and sends the data frame directly (step D). All steps are correct and occur in this order.

Question 9

Drag and drop the OSI layer names on the left to the correct PDU names and example protocols on the right.

Accepted Answer

Physical: Bits, Ethernet; Data Link: Frames, MAC; Network: Packets, IP; Transport: Segments, TCP; Session: Data, NetBIOS; Presentation: Data, SSL/TLS. Both options A and D correctly map each OSI layer to its correct PDU and example protocol(s). Physical layer: Bits, Ethernet; Data Link: Frames, MAC; Network: Packets, IP; Transport: Segments, TCP; Session: Data, NetBIOS; Presentation: Data, SSL/TLS. Option B incorrectly swaps the PDUs for Data Link and Network (should be frames and packets). Option C incorrectly swaps the PDUs for Network and Transport (should be packets and segments).

Answer

Physical: Bits, Ethernet; Data Link: Packets, IP; Network: Frames, MAC; Transport: Segments, TCP; Session: Data, NetBIOS; Presentation: Data, SSL/TLS

Answer

Physical: Bits, Ethernet; Data Link: Frames, MAC; Network: Segments, TCP; Transport: Packets, IP; Session: Data, NetBIOS; Presentation: Data, SSL/TLS

Question 10

Drag and drop the following troubleshooting steps into the correct order to isolate CRC errors, duplex mismatches, and flapping on a Cisco IOS-XE interface.

Accepted Answer

Use show commands to gather interface statistics and identify errors.. The correct troubleshooting order is: first, use show commands to gather interface statistics and identify CRC errors, duplex mismatches, and flapping (Step A). Next, apply configuration changes to resolve the identified issues (Step C). Then, clear interface counters to reset the statistics (Step B). Finally, verify the fix by monitoring interface statistics after clearing counters (Step D). This order ensures that after applying changes, you clear the old error data so that verification shows only new errors, confirming the fix. Clearing counters before verification provides a clean baseline.

Question 11

Drag and drop the following steps into the correct order to troubleshoot a suspected duplex mismatch and CRC errors on an interface using Cisco IOS-XE CLI commands.

Accepted Answer

1. Connect to the device via console or SSH
2. Enter privileged EXEC mode
3. Use 'show interfaces' to check for CRC errors and duplex mismatch
4. Enter global configuration mode
5. Use 'interface' command to enter the specific interface
6. Use 'speed 100' to set speed manually
7. Use 'duplex full' to set duplex manually
8. Use 'end' to exit configuration mode
9. Use 'copy running-config startup-config' to save. To troubleshoot duplex mismatch and CRC errors, the correct order is: first connect to the device and enter privileged EXEC mode, then use 'show interfaces' to diagnose the issue. Next, enter global configuration mode, select the interface, set the speed manually (e.g., 'speed 100'), then set the duplex manually (e.g., 'duplex full') to prevent the duplex from reverting to auto-negotiation. Finally, exit configuration mode with 'end' and save the running configuration with 'copy running-config startup-config'. Only option C follows this sequence exactly. Option A incorrectly sets duplex before speed. Option B performs the show command after making changes, which defeats the troubleshooting purpose. Option D sets duplex before speed and saves before exiting configuration mode, which is incorrect.

Answer

1. Connect to the device via console or SSH
2. Enter privileged EXEC mode
3. Use 'show interfaces' to check for CRC errors and duplex mismatch
4. Enter global configuration mode
5. Use 'interface' command to enter the specific interface
6. Use 'duplex full' to set duplex manually
7. Use 'speed 100' to set speed manually
8. Use 'end' to exit configuration mode
9. Use 'copy running-config startup-config' to save

Answer

1. Connect to the device via console or SSH
2. Enter privileged EXEC mode
3. Enter global configuration mode
4. Use 'interface' command to enter the specific interface
5. Use 'duplex full' to set duplex manually
6. Use 'speed 100' to set speed manually
7. Use 'end' to exit configuration mode
8. Use 'show interfaces' to check for CRC errors and duplex mismatch
9. Use 'copy running-config startup-config' to save

Answer

1. Connect to the device via console or SSH
2. Enter privileged EXEC mode
3. Use 'show interfaces' to check for CRC errors and duplex mismatch
4. Enter global configuration mode
5. Use 'interface' command to enter the specific interface
6. Use 'duplex full' to set duplex manually
7. Use 'speed 100' to set speed manually
8. Use 'copy running-config startup-config' to save
9. Use 'end' to exit configuration mode

Question 12

Drag and drop the following steps into the correct order to replace a faulty SFP on a Cisco switch and verify the fiber link.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Enter global configuration mode, enter interface configuration mode, assign IPv4 address, exit to enable mode, ping IPv6 host. Although the order in option A is the required sequence for configuring an IPv4 address, the final step of pinging an IPv6 EUI-64 address does not verify that the IPv4 configuration is working. The router would need IPv6 explicitly configured and the ping command would need to specify IPv6. Therefore, the marked answer is not correct as written.

Answer

Enter interface configuration mode, assign IPv4 address, enter global configuration mode, exit to enable mode, ping IPv6 host

Answer

Enter global configuration mode, assign IPv4 address, enter interface configuration mode, exit to enable mode, ping IPv6 host

Answer

Enter global configuration mode, enter interface configuration mode, assign IPv4 address, ping IPv6 host, exit to enable mode

Question 13

Drag and drop the steps into the correct order to generate an IPv6 EUI-64 address from a MAC address.

Accepted Answer

Obtain the MAC address of the host interface.. The process to generate an IPv6 EUI-64 address from a MAC address is: first, obtain the MAC address of the host interface. Then, flip the U/L bit (7th bit) of the first byte and insert FFFE between the OUI and NIC portions. These two steps may be performed in either order; they do not affect each other. Finally, combine the resulting 64-bit interface identifier with the IPv6 prefix (e.g., FE80::/10 for link-local) to form the full IPv6 address.

Question 14

Drag and drop the following steps into the correct order to replace a faulty SFP on a Cisco switch and verify the fiber link.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Configure static IPv4 address on Windows → Generate IPv6 EUI-64 address on router → Verify static IP on Windows. Configuring a static IPv4 address on Windows and generating an IPv6 EUI-64 address on a Cisco router are independent tasks with no dependency between them. Verification of the Windows static IP only requires that the Windows configuration has been completed before verification. Therefore, any order that places the Windows configuration before verification is acceptable. Both A (Windows → Router → Verify) and B (Router → Windows → Verify) satisfy this condition. The original explanation's claim that 'host tasks should precede router tasks' is not a technical requirement.

Answer

Configure static IPv4 address on Windows → Verify static IP on Windows → Generate IPv6 EUI-64 address on router

Answer

Generate IPv6 EUI-64 address on router → Verify static IP on Windows → Configure static IPv4 address on Windows

Question 15

Drag and drop the IPv6 address types on the left to their corresponding scope and prefix on the right.

Accepted Answer

Global Unicast: 2000::/3, Internet scope. The correct matches are as follows: Global Unicast has prefix 2000::/3 and Internet scope (Option A). Link-Local has prefix FE80::/10 and link-local scope, automatically assigned (Option B). Unique Local has prefix FC00::/7 and unique local scope, private and not routable on the Internet (Option C). Multicast has prefix FF00::/8 and multicast scope, used for one-to-many communication (Option D). All four options are correctly paired. Note that the scope for multicast is defined within the prefix, but the description is accurate.

Answer

FE80::/10; link-local scope, automatically assigned on each interface

Answer

FC00::/7; unique local scope, private, not routable on the Internet

Answer

FF00::/8; multicast scope, one-to-many communication