CCNA Network Infrastructure and Connectivity Practice Test 16 — 15 Questions

Question 1

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.. First install the SFP, then attach the cable, ensure both ends are connected, then verify link and check for errors to confirm proper installation.

Answer

Attach the fiber optic cable to the SFP.

Answer

Verify the link status using the 'show interfaces' command.

Answer

Check for errors using the 'show interfaces counters errors' command.

Question 2

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 assumes the fiber cable is already disconnected as a safety prerequisite. After removal of the old SFP, insert the new SFP, then reconnect the fiber cable. Finally, verify the interface status with 'show interfaces' and check for errors with 'show interfaces counters errors' to ensure proper operation.

Question 3

Which TWO statements accurately describe the characteristics and deployment considerations for fiber optic cabling in a modern enterprise network?

Accepted Answer

When using a 10GBASE-SR SFP+ transceiver over OM3 multimode fiber, the maximum supported distance is 300 meters.. The correct statements are that 10GBASE-SR over OM3 multimode fiber supports up to 300 meters and that fiber optic cabling is immune to electromagnetic interference (EMI), making it ideal for electrically noisy environments. Single-mode fiber actually has a smaller core diameter than multimode, making option A incorrect. Multimode fiber is designed for shorter links, so option B is wrong. Standard 1000BASE-LX SFP transceivers over single-mode fiber are limited to 5 km, not 10 km, so option C is inaccurate.

Answer

Single-mode fiber (SMF) typically uses a larger core diameter than multimode fiber (MMF).

Answer

Multimode fiber (MMF) is generally preferred for longer-distance links, such as between buildings on a campus network.

Answer

A 1000BASE-LX SFP transceiver operating over single-mode fiber can support distances up to 10 km.

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.. These pairings correctly match cable types to their typical maximum distances or connector types. OM3 multimode fiber supports 300 meters at 10 Gbps, not 550 meters (OM4 supports 550 meters). Single-mode fiber typically uses LC connectors, and RG-6 coaxial cable uses F-type connectors.

Question 5

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

Accepted Answer

Client sends SYN. The TCP three-way handshake starts with the client sending a SYN, followed by the server responding with SYN-ACK, and finally the client sending an ACK to establish the connection.

Answer

Server sends ACK

Question 6

Which of the following correctly describes the sequence of the TCP three-way handshake between a client and a server?

Accepted Answer

Client sends SYN, Server responds with SYN-ACK, Client sends ACK. The TCP three-way handshake establishes a reliable connection in three steps: the client sends a SYN, the server replies with SYN-ACK, and the client acknowledges with an ACK. Option A correctly depicts this. Option B omits the server's SYN, leaving synchronization incomplete. Option C reverses the roles by having the server initiate, which never occurs in a standard handshake. Option D begins with a SYN-ACK, which is not a valid initial packet; the handshake must start with a SYN.

Answer

Client sends SYN, Server responds with ACK, Client sends SYN-ACK

Answer

Server sends SYN, Client responds with SYN-ACK, Server sends ACK

Answer

Client sends SYN-ACK, Server responds with SYN, Client sends ACK

Question 7

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 starts with the client initiating the connection by sending a SYN, followed by the server acknowledging with SYN-ACK, and finally the client confirming with an ACK. This sequence establishes a reliable connection before data transfer.

Answer

Server sends ACK to client

Question 8

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 three-way handshake starts with SYN, then SYN-ACK, then ACK, after which the connection is established and data can flow.

Question 9

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

Accepted Answer

Client sends SYN (seq=x). The TCP three-way handshake begins with the client sending a SYN (A) to initiate the connection. The server replies with a SYN-ACK (B) to acknowledge the client's SYN and provide its own sequence number. Finally, the client sends an ACK (C) to confirm the server's SYN, completing the handshake. Option D, "Server sends ACK (ack=x+1)," is not part of the three-way handshake; an ACK from the server would be redundant at this stage and actually occurs during the four-way connection termination, not establishment.

Answer

Server sends ACK (ack=x+1)

Question 10

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 three-way handshake between specific IP addresses follows the same SYN, SYN-ACK, ACK sequence, with the client (PC) initiating and the server responding, leading to a connection ready for application data.

Question 11

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, then broadcasting a request if needed, the target replies with its MAC, and the source updates its cache to send data directly.

Question 12

Which single OSI model layer is responsible for both end‑to‑end reliable data delivery and segmenting data into smaller units?

Accepted Answer

Transport layer (Layer 4). The Transport layer (Layer 4) is the only layer that ensures end‑to‑end reliable delivery using protocols like TCP that provide acknowledgements, sequencing, and retransmissions. At the same time, it segments large application data streams into smaller segments suitable for transmission. The Data Link layer (Layer 2) handles hop‑by‑hop framing but not end‑to‑end reliability. The Network layer (Layer 3) routes packets but does not guarantee delivery. The Session layer (Layer 5) manages sessions, not reliability or segmentation.

Answer

Data Link layer (Layer 2)

Answer

Network layer (Layer 3)

Answer

Session layer (Layer 5)

Question 13

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. The OSI model layers map to specific PDUs and example protocols: Physical layer deals with bits and electrical signals; Data Link with frames (e.g., Ethernet); Network with packets (e.g., IP); Transport with segments (e.g., TCP); and Application with data (e.g., HTTP). Each layer encapsulates data from above, and the PDU names reflect how data is packaged at that layer.

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

Answer

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

Question 14

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

Accepted Answer

Enter configuration mode, enable debugs, monitor logs, analyze data, apply fixes and verify.. First enter configuration mode, then enable debugs to capture errors, monitor logs, analyze the data, and finally apply fixes and verify.

Answer

Enable debugs, enter configuration mode, monitor logs, analyze data, apply fixes and verify.

Answer

Monitor logs, enter configuration mode, enable debugs, analyze data, apply fixes and verify.

Answer

Enter configuration mode, monitor logs, enable debugs, analyze data, apply fixes and verify.

Question 15

Which of the following shows the correct order of steps to troubleshoot a suspected duplex mismatch and CRC errors on a Cisco IOS-XE interface?

Accepted Answer

Enter global configuration mode, then interface configuration mode for the affected interface, set duplex to full and speed to match the connected device, exit configuration mode, and verify the interface status.. The proper troubleshooting flow requires moving through the correct configuration hierarchy: from privileged EXEC mode you first enter global configuration mode. Then you specify the affected interface to enter interface configuration mode, where the duplex and speed settings are applied. After making the changes, you exit all configuration modes back to privileged EXEC and use show commands to verify the interface status. Option A follows this exact sequence. Option B is wrong because it tries to enter interface configuration without global config. Option C mistakenly attempts to set duplex/speed globally, which is not allowed. Option D not only omits global config but also exits to the wrong mode, leaving you in global configuration instead of privileged EXEC for verification.

Answer

Enter interface configuration mode directly, set duplex and speed, then exit to privileged EXEC mode and verify the interface status.

Answer

Enter global configuration mode, set duplex and speed globally, then exit and verify the interface status.

Answer

Enter interface configuration mode, set duplex and speed, then exit to global configuration mode and verify the interface status.