Free Internet Connection Technologies practice questions

A wireless ISP (WISP) delivers broadband over radio between fixed points, using a tower on an elevated structure and a customer antenna mounted on the roof or a pole. It exists specifically to fill the coverage gap in rural and semi-rural areas where running fiber or coax is too expensive and DSL performs poorly. The roof-mounted antenna aimed at a tower is the signature of a WISP install. Cable is incorrect because it requires a hybrid fiber-coaxial cable plant running to the home, which is unavailable in this scenario. Fiber is incorrect because it delivers data as pulses of light through a glass strand run to the premises, not over the air to a roof antenna. DSL is incorrect because it uses the existing telephone copper lines and, as stated, is unusable at this location. When a scenario places a customer beyond wired broadband but within reach of a tower and mentions a roof antenna with a clear path, the answer is a WISP.

The ONT is the demarcation point between the provider's network and the customer's network. When the ONT shows a steady optical status light and a good power light, it confirms a healthy optical signal is arriving from the provider. That means everything on the fiber side is working, so the fault lies on the customer's side of the demarcation point, in the router, its configuration, or the local network. The provider's OLT equipment is incorrect because a fault there would typically cause the ONT's optical alarm to light rather than showing a steady healthy signal. The fiber drop cable from the splitter is incorrect because a damaged or disconnected drop would show as a lost optical signal or a red alarm at the ONT, not a steady light. The passive optical splitter node is incorrect for the same reason, and because a splitter fault would generally affect multiple homes at once. The demarcation point defines who fixes what: confirm the ONT status, then work outward into the customer's equipment.

A WISP link depends on a clear line of sight between the customer's antenna and the tower. Radio waves at WISP frequencies travel in roughly straight lines and are absorbed or blocked by obstacles. Trees are the classic seasonal culprit: a link installed in winter with a clear path can degrade in spring when leaves fill in, because wet foliage absorbs the signal. This produces exactly the described pattern of a link that worked in winter but slows once the season changes. A failing PoE injector is incorrect because injector failure typically causes a total outage from loss of power to the outdoor radio, not seasonal, weather-correlated slowness. Updating router firmware for the season is incorrect because firmware is unrelated to seasonal signal degradation and firmware does not change with the calendar. A provider changing the tower's frequency band is incorrect because that is not something tied to spring foliage and would not selectively affect one customer whose path just leafed in. Seasonal and weather-driven changes to line of sight are a common source of intermittent WISP complaints.

The optical network terminal (ONT) is the device that terminates the fiber line at the customer's location and performs optical-to-electrical conversion, handing off a standard Ethernet connection that a router can understand. Without the ONT, the light traveling down the fiber is useless to standard networking equipment. A cable modem is incorrect because it modulates and demodulates signals on a coaxial copper line using DOCSIS, not light on fiber. The OLT (optical line terminal) is incorrect because it sits at the provider's facility, not the customer premises; the OLT-to-ONT relationship defines the link, with the OLT at the provider end and the ONT at the customer end. A PoE injector is incorrect because it supplies power over an Ethernet cable to a device such as a WISP outdoor radio and does no optical conversion. While the ONT is sometimes casually called a 'fiber modem,' that nickname is technically imprecise, and the exam expects you to know the term ONT specifically.

A point-to-multipoint design places one access point at the tower that serves many customers, and everyone connected to that access point shares its capacity. When many subscribers pull data through the same access point at once, such as on a weekday evening, each user's share drops. This contention produces exactly the described symptom: fast at noon, slow at 8 p.m., with no fault in the customer's own equipment. Point-to-point link degradation from antenna drift is incorrect because a point-to-point link connects only two dedicated sites and would show consistent degradation, not a time-of-day pattern tied to other users. Fresnel zone interference from temperature drops is incorrect because Fresnel zone obstruction comes from physical objects intruding on the signal path, not from the time of day or evening temperatures. PoE injector overheating is incorrect because injectors either work or fail; they do not throttle performance predictably at peak hours, and their failure typically causes complete outages rather than time-based slowdowns. Evening slowdowns on point-to-multipoint service are the provider's capacity problem to solve.

Fiber supports symmetrical speeds far more easily than other technologies, often providing the same upload and download rate, such as 1 Gbps up and 1 Gbps down. For a business uploading large files daily, symmetrical upload is the deciding advantage because cable connections are usually asymmetrical, with much slower upload than download. The claim that fiber uses a shared node with other subscribers is incorrect as a distinguishing benefit; cable is the technology known for its shared coaxial segment, and while fiber PON architecture does share a splitter, that is not what makes it better for uploads. The statement that fiber degrades less with distance from the tower is incorrect because fiber does not use a tower; that distance-and-tower concept applies to WISP, and distance-based degradation is a DSL trait relative to the central office. Weather tolerance is incorrect because weather sensitivity is a concern for wireless technologies like satellite and WISP, not a primary fiber-versus-cable differentiator. When a scenario emphasizes equal upload and download on a wired connection, the answer is fiber.

A red optical alarm at the ONT indicates the optical signal from the provider is not reaching the customer. Since the ONT and the fiber line are provider-owned equipment on the provider's side of the demarcation point, and the connector is properly seated and undamaged, the correct move is to contact the provider so they can test the link from the OLT to see whether the signal is reaching the customer. Replacing the customer's router is incorrect because a router problem would not cause an optical alarm on the ONT; the alarm points to the fiber side, not the local network. Swapping the Ethernet cable is incorrect for the same reason, as the Ethernet handoff sits on the customer side and cannot cause a loss of optical signal. Opening the ONT enclosure to reseat an optical module is incorrect because a technician does not open or service provider-owned equipment; doing so risks damage and eye injury from invisible laser light. The technician's value on this call is confirming the physical status of the ONT so the provider knows the problem is upstream.

A WISP's customer premises equipment is an outdoor radio that draws power over a single Ethernet cable through Power over Ethernet. Because the CPE lives outdoors and depends on one PoE cable, a very common cause of total outage is a dead PoE injector or its small wall adapter, not the radio link itself. When troubleshooting a WISP outage, checking power to the outdoor unit is often more productive than blaming the sky, so the injector is inspected first. The customer's internal Wi-Fi router settings are incorrect as the first check because a WISP behaves like ordinary broadband from the router inward and the router is checked last, working from the inside out. The tower's point-to-multipoint access point is incorrect because that is provider-side equipment; a technician cannot readily inspect it and would only suspect it after ruling out local power and cabling. The provider's wireless backhaul link is likewise provider-owned and inaccessible to the on-site technician, so it is not the first thing to check. Sorting the complaint into the local gear group versus the wireless path group is most of the troubleshooting work.

A green connector body polished at an angle indicates an APC (angled physical contact) connector, and many fiber-to-the-home installs use SC/APC connectors at the ONT. The critical handling rule is that you never mix APC and UPC connectors, because the mismatched tip geometries will not mate properly and will degrade the signal. SC/UPC that can mate with any APC port is incorrect because UPC and APC tips are polished differently and must never be intermixed; the description of a green angled connector is APC, not UPC. LC/UPC requiring an ST adapter is incorrect because the green angled body identifies an APC polish, not UPC, and LC and ST are entirely different connector form factors that are not bridged that way. ST/APC using a bayonet-style twist lock is incorrect because ST is an older round bayonet connector, while the square push-pull SC connector is the type common on ONTs and provider equipment. Remembering that APC connectors have a green body and angled polish, and that they must not be mixed with UPC, prevents signal-degrading mismatches on real installs.

Most residential fiber uses a passive optical network (PON) architecture, in which a single feeder fiber from the provider runs to a passive splitter that divides the light among many homes, often 32 or more. Because many homes hang off one feeder fiber and splitter, a cut or fault upstream of the splitter can knock out an entire street at once. When several neighbors report an outage simultaneously, the problem is almost certainly on the provider's side, upstream at the shared feeder or splitter, not in any single customer's equipment. Each customer's individual router configuration is incorrect because it is statistically implausible for many independent routers to fail at the same moment; a shared symptom points to a shared cause. The Ethernet handoff at each separate ONT is incorrect for the same reason, as those handoffs are independent per home and would not fail together. The APC connector inside each home's ONT is incorrect because those are individual physical connections that would only affect one home, not the whole street. The shared, split nature of PON explains why widespread simultaneous outages are a provider-side issue.