220-1201 Practice Test 19 — 15 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?

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

Accepted Answer

Cable tester with wire map. A cable tester with wire map is the correct tool because it verifies that each of the eight wires in the Ethernet cable is terminated to the correct pin on the RJ45 connector according to the T568A standard. This ensures proper continuity and pin-to-pin mapping, which is essential for reliable network connectivity. Intermittent issues often stem from miswired or broken pairs, which a wire map test can detect.

Answer

Multimeter

Answer

Toner and probe

Answer

Crimper

Question 2

A small office uses a single router with four LAN ports. The manager wants to connect 12 wired devices and ensure they can all communicate with each other without purchasing a new router. Which network device should be added to the existing setup?

Accepted Answer

Switch. A switch is the correct device because it operates at Layer 2 (Data Link layer) of the OSI model, using MAC addresses to forward frames only to the specific port where the destination device is connected. This allows the existing router to remain the gateway for internet access while the switch expands the number of available Ethernet ports, enabling all 12 wired devices to communicate within the same local network without purchasing a new router.

Answer

Hub

Answer

Router

Answer

Repeater

Question 3

A technician is called to a data center where a server with a RAID 6 array of six 8 TB drives has experienced a double drive failure. The technician replaces both failed drives. After the rebuild, the array reports as healthy but the performance is extremely slow during normal operations. What is the most likely cause?

Accepted Answer

The array is still rebuilding in the background, consuming I/O resources.. After a rebuild, the array may be performing a background consistency check or initialization that consumes I/O resources. RAID 6 rebuilds are intensive, and the controller may be verifying parity. This tests advanced RAID troubleshooting.

Answer

The new drives have a different rotational speed.

Answer

The RAID controller cache battery is dead.

Answer

The stripe size was changed during the rebuild.

Question 4

A technician is configuring a network for a branch office that will use a router to connect to the main office over the internet. The connection must be encrypted and authenticated to ensure data privacy. Which protocol should the technician configure on the router?

Accepted Answer

IPsec. IPsec is the correct protocol because it provides both encryption and authentication at the network layer, making it ideal for securing site-to-site VPN connections over the internet. It ensures data privacy by encrypting the entire IP packet and authenticates the communicating peers using protocols like IKE (Internet Key Exchange). This matches the requirement for a router-to-router connection where all traffic between branch and main office must be protected.

Answer

SSL/TLS

Answer

PPTP

Answer

L2TP

Question 5

A small office uses a single public IP address for internet access. The network administrator wants internal web servers to be reachable from the internet on port 80. Which network service should be configured on the router to allow this?

Accepted Answer

Port forwarding. Port forwarding (option B) is the correct answer because it allows the router to translate incoming traffic on a specific public IP address and port (e.g., TCP 80) to a specific internal private IP address and port of the web server. This is a form of Destination NAT (DNAT) that enables external hosts to reach internal services when only a single public IP is available.

Answer

DHCP

Answer

DNS

Answer

VPN

Question 6

A user configures their laptop to use a static IP address, subnet mask, and default gateway. They can ping other devices on the same subnet but cannot reach the internet. What network service is most likely missing from their configuration?

Accepted Answer

DNS server. A static IP configuration includes the IP address, subnet mask, and default gateway, but if the DNS server address is not manually set, the laptop cannot resolve domain names to IP addresses. Since the user can ping devices on the same subnet (local connectivity works) but cannot reach the internet, the missing DNS server prevents name resolution for external hosts, even though routing via the default gateway is functional.

Answer

DHCP server

Answer

NAT

Answer

Proxy server

Question 7

A customer calls to say their new smart TV can see the 2.4 GHz network but not the 5 GHz network, even though the router is dual-band. The technician checks the router settings and confirms both bands are enabled and broadcasting. What is the most likely reason the TV cannot see the 5 GHz network?

Accepted Answer

The TV’s wireless adapter does not support 5 GHz. The most common reason a device sees only the 2.4 GHz band is that its wireless adapter lacks 5 GHz support. Many older or budget smart TVs ship with single-band 2.4 GHz Wi-Fi chipsets, so even though the router broadcasts both bands, the TV’s hardware cannot detect or connect to the 5 GHz network.

Answer

The 5 GHz SSID is hidden

Answer

The 5 GHz channel is set to a DFS channel

Answer

The router’s 5 GHz radio is faulty

Question 8

A user's cable internet goes out completely after a power outage. The modem's power light is on, but the 'online' light is blinking. What is the most likely issue?

Accepted Answer

The modem is re-establishing its connection to the ISP.. After a power outage, the modem's power light being on indicates it has power, but the blinking 'online' light shows it has lost its upstream connection to the ISP. Cable modems use DOCSIS (Data Over Cable Service Interface Specification) to establish a link with the Cable Modem Termination System (CMTS). The blinking online light is the standard behavior during the re-initialization and ranging process, which can take several minutes as the modem negotiates frequencies, timing, and power levels with the CMTS.

Answer

The modem's firmware was corrupted during the outage.

Answer

The coaxial cable was damaged by the power surge.

Answer

The router's DHCP server failed.

Question 9

A customer reports that their new printer, configured with a static IP of 192.168.1.100, cannot be accessed from any computer on the network. The technician pings 192.168.1.100 from a workstation and gets no reply. The workstation's IP is 192.168.1.50 with a subnet mask of 255.255.255.0. What is the most likely cause?

Accepted Answer

The printer's static IP address conflicts with another device on the network.. The most likely cause is that the printer's static IP address (192.168.1.100) conflicts with another device on the same subnet. When two devices share the same IP, the network becomes unreachable for one or both due to ARP table instability. The ping fails because the workstation's ARP cache may resolve the IP to the wrong MAC address, or the printer may not respond at all if it detects the conflict via gratuitous ARP.

Answer

The printer's IP address is on a different subnet than the workstation.

Answer

The workstation's subnet mask is set to 255.255.0.0.

Answer

The printer's default gateway is misconfigured.

Question 10

A technician is troubleshooting a network where a user cannot access the internet. The user's workstation has an IP of 192.168.1.15, subnet mask 255.255.255.0, and default gateway 192.168.1.1. The technician pings 192.168.1.1 successfully but cannot ping 8.8.8.8. What is the most likely cause?

Accepted Answer

The router's WAN connection is down or misconfigured.. Successful pings to the default gateway (192.168.1.1) confirm that Layer 2 and Layer 3 connectivity within the local subnet is working, and that the workstation's IP, subnet mask, and default gateway are correctly configured. Failure to ping 8.8.8.8 (a public IP) indicates that traffic is not being routed beyond the local network, which points to an issue with the router's WAN connection or its routing configuration to the internet.

Answer

The workstation's subnet mask is incorrect.

Answer

The DNS server is not configured on the workstation.

Answer

The workstation's IP address is a duplicate.

Question 11

A technician is installing a new video card in a desktop PC used for graphic design. The card has one HDMI port, one DisplayPort, and two DVI ports. The user wants to connect two 1920x1080 monitors. Which combination of ports and cables will provide the best image quality and support for both monitors?

Accepted Answer

Use the HDMI port for one monitor and the DisplayPort for the other. The DisplayPort and HDMI ports both support digital video and audio, and at 1920x1080 resolution, both can deliver excellent image quality. However, DisplayPort is the preferred choice for the primary monitor in a graphic design setup because it supports higher color depths and refresh rates over longer cable lengths, and it is the native interface for modern video cards. Using HDMI for one monitor and DisplayPort for the other allows both monitors to run at their native resolution without signal degradation, while DVI (especially single-link DVI) is limited to 1920x1080 at 60 Hz and lacks the bandwidth for higher color fidelity or future upgrades.

Answer

Use the HDMI port for one monitor and a DVI port for the other

Answer

Use both DVI ports for the monitors

Answer

Use a DisplayPort splitter to run both monitors from the single DisplayPort

Question 12

A technician is deploying a point-to-point wireless bridge between two buildings 500 meters apart. The link must support at least 1 Gbps throughput. Both buildings have clear line of sight. Which antenna type and frequency combination is most appropriate?

Accepted Answer

Parabolic dish antennas on 5 GHz. A point-to-point bridge over 500 meters requiring 1 Gbps throughput needs high-gain, directional antennas and a frequency band with sufficient bandwidth. Parabolic dish antennas on 5 GHz provide the necessary high gain (typically 20-30 dBi) and utilize the wider 5 GHz channel bandwidth (up to 80 or 160 MHz) to achieve gigabit speeds, while maintaining a narrow beamwidth to focus the signal between the two buildings.

Answer

Omnidirectional antennas on 2.4 GHz

Answer

Yagi antennas on 2.4 GHz

Answer

Patch antennas on 5 GHz

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 is specifically designed to verify proper termination and detect faults like shorts, opens, or miswires in copper Ethernet cables. Since the cable is not connected to any network device, a cable tester can independently validate the integrity of each wire pair by sending signals and checking continuity, which is exactly what this scenario requires.

Answer

Tone generator and probe

Answer

Multimeter

Answer

Loopback plug

Question 14

A user reports that their wired connection is intermittent. They are using a Cat5e cable connected to a 1000BASE-T switch. The link light on the switch port is blinking rapidly. What is the most likely cause of the intermittent connection?

Accepted Answer

The cable is damaged or has a loose connector. A rapidly blinking link light typically indicates active data transmission, but when paired with an intermittent connection, it often points to physical-layer issues. A damaged Cat5e cable or loose connector can cause frequent link flaps and CRC errors, leading to the rapid blinking as the switch repeatedly attempts to re-establish the link. This is the most likely cause because the symptom (blinking link light) aligns with physical-layer problems rather than configuration or load issues.

Answer

The switch port is set to half-duplex

Answer

The network card is configured for 10 Mbps

Answer

The switch is overloaded with traffic

Question 15

A small office uses a network printer that is shared via a print server. Users report that print jobs are not reaching the printer. The technician pings the print server successfully but cannot connect to the printer's web interface using its IP address. Which protocol is most likely blocked or malfunctioning?

Accepted Answer

HTTP. The technician can ping the print server (ICMP success) but cannot connect to the printer's web interface via its IP address. The web interface uses HTTP (port 80) or HTTPS (port 443). Since ICMP is working but HTTP is not, the most likely issue is that HTTP traffic is being blocked by a firewall or the HTTP service on the printer is malfunctioning. This directly points to HTTP as the blocked or malfunctioning protocol.

Answer

TCP

Answer

UDP

Answer

SNMP