CCNA Network Infrastructure and Connectivity Practice Test 4 — 15 Questions

Question 1

Which TWO statements are true about IPv6 link-local addresses?

Accepted Answer

They are automatically configured on all IPv6-enabled interfaces.. Option A is correct because every IPv6-enabled interface automatically generates a link-local address (via stateless autoconfiguration) as soon as IPv6 is enabled, without requiring DHCPv6 or manual configuration. Option E is correct because link-local addresses are defined by the prefix fe80::/10, meaning the first 10 bits are 1111111010, which is why addresses typically appear as fe80::/64 on a link. Option B is wrong because link-local addresses are non-routable and scoped only to a single link, so routers do not forward them beyond that segment. Option C is wrong because the interface ID is not always EUI-64; it can be randomly generated (RFC 4941 privacy extensions) or manually configured. Option D is wrong because IPv6 hosts use a router's link-local address as the next-hop/default gateway, but the link-local address itself is not the default gateway address assigned to hosts.

Answer

They are routable across the entire IPv6 internet.

Answer

They always use the EUI-64 format for the interface ID.

Answer

They are used as the default gateway address for IPv6 hosts.

Question 2

Drag and drop the wireless terms on the left to the correct descriptions on the right.

Accepted Answer

SSID: The network name broadcast by the access point to identify the wireless network.. SSID, BSSID, and Beacon are correctly matched. However, Channel is incorrectly described as '2.4 GHz or 5 GHz bands' — these are frequency bands, not channels. A channel is a specific subdivision within a band, such as 2.4 GHz channel 6. Therefore, option C is not a correct pairing.

Answer

Channel: A specific frequency range used for wireless communication, such as 2.4 GHz or 5 GHz bands.

Question 3

Drag and drop the Wi-Fi features on the left to the correct descriptions on the right.

Accepted Answer

MIMO: Uses multiple antennas to improve throughput and range. 802.11ax (Wi-Fi 6) uses OFDMA to divide channels into smaller subcarriers, allowing simultaneous transmission to multiple clients and improving efficiency in dense environments. WPA3-Personal employs Simultaneous Authentication of Equals (SAE) to replace the vulnerable pre-shared key handshake, providing secure password-based authentication resistant to offline dictionary attacks. A Basic Service Set (BSS) is the fundamental building block of a WLAN, consisting of a single access point (AP) and all associated wireless clients. A Wireless LAN Controller (WLC) centralizes AP management, handling configuration, firmware updates, and seamless roaming across multiple APs. Channel bonding (80 MHz) combines two 40 MHz channels, doubling the channel width to increase throughput; it is commonly used in 802.11ac (Wi-Fi 5) to achieve higher data rates.

Question 4

A user reports intermittent connectivity to the corporate web server at 10.1.1.100. The user's PC (IP 192.168.1.50/24, gateway 192.168.1.1) can ping the gateway and other local hosts, but pings to the web server time out every few seconds. The network administrator runs a traceroute from the PC and checks the local ARP cache. What is the most likely cause of the intermittent connectivity?

Accepted Answer

The web server at 10.1.1.100 has a duplicate IP address conflict with another device on the same subnet.. The correct answer is B: the web server at 10.1.1.100 has a duplicate IP address conflict with another device on the same subnet. Intermittent connectivity that comes and goes every few seconds is a classic symptom of an IP conflict, because two devices alternately answer ARP requests for the same address, causing the PC's ARP cache to flip between different MAC addresses and traffic to be delivered inconsistently. A traceroute would typically show the path reaching the destination network but with erratic or dropped responses, and the ARP cache would reveal changing MAC entries for 10.1.1.100. Option A is wrong because if the gateway did not route to 10.1.1.0/24, connectivity would fail consistently rather than intermittently. Option C is wrong because an incorrect subnet mask would cause consistent failure to reach remote networks, not periodic timeouts. Option D is wrong because a powered-off server or faulty NIC would produce continuous unreachability, not intermittent responses.

Answer

The default gateway 192.168.1.1 is not configured to route traffic to the 10.1.1.0/24 network.

Answer

The user's PC has an incorrect subnet mask configured, preventing communication with the web server.

Answer

The web server is powered off or has a faulty network interface card.

Question 5

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

Remove the faulty SFP module from the switch port.. The correct sequence is: remove the faulty SFP module (A), install the new SFP module (C), connect the fiber cable (B), and finally verify using 'show interfaces' and 'show interfaces transceiver' commands (D). This order ensures proper handling and avoids damage.

Question 6

Drag and drop the following steps into the correct order to install a new fiber optic link between two switches, including SFP insertion and basic troubleshooting.

Accepted Answer

Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on both switches.. The correct installation order follows best practice: insert the SFP and connect the cable on one switch before moving to the other. This minimizes the time the SFP module is exposed and prevents potential damage. Option A is the only correct sequence. Option B exposes both SFPs before cabling, increasing risk of contamination. Option C attempts to connect cables before inserting SFPs, which is impractical and can cause damage. Option D verifies link on Switch A before the other end is connected, which will show a down state and is not a valid step sequence.

Answer

Insert SFP into Switch A, then insert SFP into Switch B, then connect fiber cable to both SFPs, then verify link status on both switches.

Answer

Connect fiber cable to SFP on Switch A, then insert SFP into Switch A, then connect fiber cable to SFP on Switch B, then insert SFP into Switch B, then verify link status on both switches.

Answer

Insert SFP into Switch A, connect fiber cable to SFP on Switch A, then verify link status on Switch A, then insert SFP into Switch B and connect fiber cable to SFP on Switch B, then verify link status on Switch B.

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.

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 8

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 9

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 10

Drag and drop the following steps into the correct order to replace a faulty fiber optic SFP module and verify the interface on a Cisco IOS-XE switch. Assume the fiber cable is already disconnected from the SFP module.

Accepted Answer

Remove the old SFP module, insert the new SFP module, connect the fiber cable, verify interface status with 'show interfaces', and check for errors with 'show interfaces counters errors'.. The correct order for replacing a faulty SFP module is: first remove the old module, then insert the new one, then connect the fiber cable, and finally verify the interface status and check for errors. Option A follows this sequence exactly. Options B, C, and D each have steps out of order: B connects the cable before removing the old module; C connects the cable before inserting the new module; D verifies the interface before connecting the cable, which would result in the interface being down during verification.

Answer

Connect the fiber cable, remove the old SFP module, insert the new SFP module, verify interface status with 'show interfaces', and check for errors with 'show interfaces counters errors'.

Answer

Remove the old SFP module, connect the fiber cable, insert the new SFP module, verify interface status with 'show interfaces', and check for errors with 'show interfaces counters errors'.

Answer

Remove the old SFP module, insert the new SFP module, verify interface status with 'show interfaces', connect the fiber cable, and check for errors with 'show interfaces counters errors'.

Question 11

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 12

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 13

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 14

Drag and drop the following steps into the correct order to describe the TCP three-way handshake between a PC (192.168.1.10) and a web server (192.168.2.20). Note: Only three of the four steps are part of the actual handshake. Omit the step that is not part of the three-way handshake.

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 15

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.