220-1201 Networking Tools — 20 Questions

Question 1

A small office has intermittent connectivity issues. The technician needs to verify that the Ethernet cable from the wall jack to the workstation meets T568A wiring standards. Which tool is most appropriate for this task?

Accepted Answer

Cable tester with wire map. A cable tester with wire-map functionality verifies that each pin is connected to the correct pin at the other end, confirming T568A or T568B compliance. A multimeter can only check continuity, not pin-to-pin mapping. A toner/probe identifies cables, and a crimper attaches connectors.

Answer

Multimeter

Answer

Toner and probe

Answer

Crimper

Question 2

During a site survey, a technician needs to measure the signal strength of a wireless access point from various locations in an office to ensure adequate coverage. Which tool should be used for this task?

Accepted Answer

Wi-Fi analyzer. A Wi-Fi analyzer (often a software tool on a laptop or mobile device) measures signal strength in dBm and can display coverage heat maps. A multimeter measures electrical signals, not RF. A spectrum analyzer measures RF interference but is more complex. A cable tester is for wired connections.

Answer

Multimeter

Answer

Spectrum analyzer

Answer

Cable tester

Question 3

A user complains that their wired connection drops randomly for a few seconds then reconnects. The technician suspects electromagnetic interference (EMI) from nearby power cables. Which tool can best confirm the presence of excessive EMI on the network cable?

Accepted Answer

Cable tester. A cable tester with a wire map function can detect signal degradation caused by EMI, often showing intermittent faults or crosstalk. A multimeter measures voltage/continuity but not EMI on data cables. A loopback plug tests NIC functionality, and a spectrum analyzer is overkill for simple EMI detection in this context.

Answer

Multimeter

Answer

Loopback plug

Answer

Spectrum analyzer

Question 4

During a network upgrade, a technician needs to document the physical path a cable takes from a workstation to the patch panel in the server room. Which tool is specifically designed to trace the exact cable route through walls and ceilings?

Accepted Answer

Toner and probe. A toner and probe set is the standard tool for tracing individual cables among many. The toner generates a signal on the wire, and the probe emits an audible tone when near the correct cable. Cable testers check continuity, crimpers attach connectors, and punch-down tools terminate cables—none trace routes.

Answer

Cable tester

Answer

Crimper

Answer

Punch-down tool

Question 5

A customer reports that their new laptop can connect to websites using IP addresses but cannot resolve domain names like 'www.example.com'. Which networking tool should be used to verify the DNS server configuration on the laptop?

Accepted Answer

ipconfig /all. This scenario describes a DNS resolution failure—the device can reach IP addresses but not domain names. The `ipconfig /all` command on Windows displays the configured DNS servers, allowing verification. Tools like `ping` test connectivity, `nslookup` queries DNS, and `tracert` traces routes, but only `ipconfig /all` shows the DNS server addresses assigned to the interface.

Answer

ping 8.8.8.8

Answer

nslookup www.example.com

Answer

tracert 8.8.8.8

Question 6

A technician is troubleshooting intermittent packet loss on a critical link between two buildings. The link uses single-mode fiber optic cable. Which tool is specifically designed to measure the length of the fiber and locate breaks or splices that could cause signal loss?

Accepted Answer

OTDR. An Optical Time-Domain Reflectometer (OTDR) sends laser pulses down the fiber and analyzes reflected light to measure distance and locate faults. A light meter measures overall signal power but not distance. A multimeter is for electrical circuits, and a cable tester is for copper, not fiber.

Answer

Light meter

Answer

Multimeter

Answer

Cable tester

Question 7

A technician is deploying a new VoIP phone and needs to ensure the Ethernet cable connecting the phone to the wall jack provides sufficient power for the phone to operate. The network switch supports Power over Ethernet (PoE). Which tool can verify that PoE is active on the cable?

Accepted Answer

PoE tester. A PoE tester specifically detects whether power is being delivered over the Ethernet cable and can indicate the voltage and power class. A multimeter can measure voltage if you know which pins to test, but a PoE tester is simpler and safer. A cable tester checks continuity, and a loopback plug tests NIC functionality.

Answer

Multimeter

Answer

Cable tester

Answer

Loopback plug

Question 8

A network administrator needs to determine the exact model and firmware version of a switch located in a remote wiring closet without physically visiting the site. The switch is configured with an IP address on the management VLAN. Which tool can be used to query the switch's SNMP agent for this information?

Accepted Answer

SNMP management tool. SNMP (Simple Network Management Protocol) allows querying network devices for information like model, firmware, and status. An SNMP manager or MIB browser can retrieve this data. A packet analyzer captures traffic but doesn't query specific OIDs. A port scanner only shows open ports, and a Wi-Fi analyzer is for wireless.

Answer

Packet analyzer (e.g., Wireshark)

Answer

Port scanner (e.g., Nmap)

Answer

Wi-Fi analyzer

Question 9

A server administrator reports that a critical server is unreachable from the network. The technician can ping the server's IP address from the local subnet but not from a remote subnet. Which command-line tool should be used to identify where packets are being dropped along the path?

Accepted Answer

tracert. Tracert (or traceroute) sends packets with increasing TTL values to map the route and show where hops fail, pinpointing the router or firewall dropping packets. Ping only tests end-to-end reachability, netstat shows active connections, and pathping combines ping and tracert but is slower.

Answer

ping -t

Answer

netstat -r

Answer

pathping

Question 10

A user reports that their computer cannot access any network resources, but the link light on the NIC is solid. The technician suspects a faulty cable. Which tool can quickly test the cable's continuity and detect a broken wire?

Accepted Answer

Cable tester. A cable tester sends signals through each wire in the cable and checks for continuity, shorts, or opens. A multimeter can test continuity but requires disconnecting the cable and testing each wire individually, which is less efficient. A toner/probe identifies cables, and a crimper repairs them.

Answer

Multimeter

Answer

Toner and probe

Answer

Crimper

Question 11

A technician is troubleshooting a user's computer that can reach internal servers by IP address but not by hostname. Other computers on the same subnet work correctly. Which tool should the technician use to check the computer's DNS resolution?

Accepted Answer

nslookup. The nslookup command queries DNS servers to resolve hostnames to IP addresses. Since internal IPs work but names don't, the issue is likely DNS-related, and nslookup can test whether the computer's DNS server is responding correctly.

Answer

Ping

Answer

ipconfig /flushdns

Answer

Netstat

Question 12

A user's laptop intermittently loses connection to the wireless network. The technician suspects channel congestion from nearby access points. Which tool should be used to identify the least congested Wi-Fi channel?

Accepted Answer

Wi-Fi analyzer. A Wi-Fi analyzer scans the airwaves to show nearby access points, their channels, and signal strength. This data helps the technician choose a channel with less interference, improving connection stability.

Answer

Ping

Answer

Tracert

Answer

Cable tester

Question 13

During a network cable installation, a technician needs to verify that a newly run Cat6 cable is properly terminated and free of shorts or opens. The cable is not yet connected to any switch or device. Which tool should the technician use?

Accepted Answer

Cable tester. A cable tester sends signals down each wire pair and checks for continuity, shorts, opens, and miswiring. Because the cable is not connected to live equipment, a cable tester is the correct tool for this verification.

Answer

Tone generator and probe

Answer

Multimeter

Answer

Loopback plug

Question 14

A small office has intermittent network dropouts. A technician suspects electromagnetic interference (EMI) from nearby fluorescent lights affecting the unshielded twisted-pair (UTP) cables. Which tool can best confirm the presence of EMI on the cable?

Accepted Answer

Cable certifier. A cable certifier (or advanced cable tester) can measure signal-to-noise ratio and detect excessive noise or interference on the cable. This tool provides quantitative data to confirm EMI issues, unlike simpler testers.

Answer

Tone generator

Answer

Ping

Answer

Wi-Fi analyzer

Question 15

A user reports that their wired desktop cannot connect to the network. The technician verifies the link light on the computer's NIC is off. Using a known-good patch cable does not resolve the issue. Which tool should be used to test the wall jack's wiring?

Accepted Answer

Tone generator and probe. A tone generator and probe allow a technician to trace the wall jack back to the patch panel and verify continuity. Since the link light is off and a known-good cable didn't help, the issue may be in the wall jack or its termination, and tracing the cable is the next step.

Answer

Cable tester

Answer

Loopback plug

Answer

Multimeter

Question 16

A company's IT department is deploying new VoIP phones. After connecting a phone to a PoE switch, the phone does not power on. The switch port is configured for PoE and shows no errors. Which tool should be used to verify that the Ethernet cable delivers power correctly?

Accepted Answer

Multimeter. A multimeter can measure voltage on the Ethernet cable's power pairs. Since the switch is configured for PoE and the cable appears intact, measuring voltage at the phone end can confirm whether power is reaching the device.

Answer

Cable tester

Answer

Tone generator

Answer

Wi-Fi analyzer

Question 17

A user reports that their new laptop can connect to the office Wi-Fi but cannot access any internet sites. Other devices on the same network work fine. Which tool should be used first to verify the laptop's IP configuration?

Accepted Answer

ipconfig. The ipconfig command displays the IP address, subnet mask, and default gateway assigned to a network adapter. Since the laptop connects to Wi-Fi but can't reach the internet, checking its IP configuration (e.g., whether it received a valid address via DHCP) is the logical first step.

Answer

Ping

Answer

Tracert

Answer

Netstat

Question 18

A network administrator is troubleshooting a slow connection between two buildings connected by a fiber optic link. The link is up but throughput is lower than expected. Which tool should be used to measure the exact signal loss in the fiber?

Accepted Answer

OTDR. An optical time-domain reflectometer (OTDR) sends light pulses into the fiber and measures backscatter to identify loss, splices, bends, and breaks. It provides a detailed profile of the fiber's condition, which is crucial for diagnosing throughput issues.

Answer

Multimeter

Answer

Tone generator

Answer

Wi-Fi analyzer

Question 19

A technician is deploying a new network in a warehouse and needs to measure the length of a spool of Cat6a cable before installation to ensure it does not exceed the 100-meter segment limit. Which tool should be used?

Accepted Answer

TDR (Time-Domain Reflectometer). A time-domain reflectometer (TDR) sends a pulse down the cable and measures the time it takes to reflect back, calculating the length accurately. This is essential for verifying cable runs stay within specification before installation.

Answer

Multimeter

Answer

Cable tester

Answer

Tone generator

Question 20

A technician is configuring a small office network and needs to assign a static IP address to a printer. The technician pings the intended IP address and gets no reply, but the printer still fails to communicate after configuration. Which tool should be used to verify that no other device on the network is using that IP address?

Accepted Answer

arp -a. The arp command shows the IP-to-MAC address mappings in the local ARP cache. If another device responded to a ping earlier, its MAC might be cached, or the technician can use arp -a to check for existing entries. However, a more reliable method is to use a network scanner or check the DHCP server logs. In this context, arp helps verify if the IP is already in use by checking the cache after a broadcast.

Answer

Ping -t

Answer

ipconfig /all

Answer

Netstat -r