CCNA Internet Connection Types Questions

Fiber-optic provides low latency and symmetrical speeds, ideal for VoIP. Cable broadband can suffer from latency spikes due to shared bandwidth and has asymmetrical speeds. Fiber's dedicated connection ensures consistent call quality.

DSL requires a microfilter on every phone device to prevent interference from voice signals. Without it, the phone handset can cause noise that disrupts the DSL signal, leading to disconnects. This is a common DSL troubleshooting step.

Fiber optic internet provides symmetrical speeds (same upload and download) and can offer SLAs, making it ideal for business needs. Cable and DSL typically have asymmetrical speeds and no SLA, while satellite has high latency and is not suitable for business-critical applications.

Cable internet uses a shared bandwidth model where all subscribers in a neighborhood contend for the same upstream and downstream channels. During peak usage, congestion reduces throughput for everyone, especially with older DOCSIS 3.0 modems.

Satellite internet is the only viable option for locations far from wired infrastructure because it requires only a clear view of the sky. DSL, cable, and fiber all depend on physical cabling that is not available in such a remote area.

Fiber internet requires an Optical Network Terminal (ONT) to convert the optical signal to electrical signals for use by a router. A cable modem is for coax, a DSL modem is for phone lines, and a satellite modem is for satellite dishes.

DSL uses existing phone lines and is widely available in urban areas, making it a practical choice. Cable requires a coaxial outlet, satellite is prohibited, and fiber may not be available in all apartment buildings. DSL offers a balance of availability and cost.

Cable internet uses coaxial cables that can be susceptible to signal degradation when water enters the line, especially at connectors or splices. This is a common issue during rainstorms. DSL, fiber, and satellite are less affected by rain in this specific way, though satellite can have rain fade.

DSL uses standard telephone cables (RJ-11) to connect to the wall jack. Coaxial (RG-6) is for cable, fiber uses a specialized connector, and Ethernet (RJ-45) is used for LAN connections or some fiber modems.

Satellite internet is susceptible to rain fade, where heavy rain attenuates the signal, causing dropouts. Fiber and cable are underground and unaffected by rain, while DSL uses phone lines. This symptom is classic for satellite connections.

A red LOS light indicates no optical signal is reaching the ONT. Even if the cable looks intact, the most common cause is a dirty or damaged connector at the termination point. Cleaning the fiber end with a proper kit often resolves the issue.

Fiber-optic connections typically use an ONT that converts optical signals to electrical, and the router connects via Ethernet (RJ45). Coaxial is for cable, RJ11 for DSL, and fiber patch cables connect the ONT to the wall, not the router. Ethernet is the standard interface for modern fiber installations.

Cable internet uses a shared bandwidth model where many users in the same neighborhood contend for the same local loop capacity. During peak usage times (evenings), this contention leads to slower speeds. Wireless interference, router age, or ISP throttling are less likely to cause consistent evening slowdowns.

Cat5e cable is rated for 100 meters at 1 Gbps, so distance alone is not a problem. However, if the cable is damaged or poorly terminated, it can cause errors and speed reduction. The most common issue is a faulty cable or connection, not the distance itself.

Satellite internet inherently has high latency (typically 500-800 ms) due to the long distance the signal must travel to and from the satellite in geostationary orbit. This is a fundamental characteristic, not a fault. The other options could cause disconnections but not specifically high latency.

Satellite internet is the best choice for rural areas without wired infrastructure because it requires only a clear view of the sky. DSL and cable both depend on wired connections, and cellular may be unreliable in remote locations. Satellite provides coverage almost anywhere, though it has higher latency.

Fiber-optic internet provides symmetrical upload and download speeds, ideal for cloud applications. Cable broadband offers high download speeds but slower uploads, while DSL and satellite are slower and often asymmetrical. Fiber is the best fit when the infrastructure is already in place.

DSL speed is highly dependent on distance from the central office; at 12,000 feet, signal attenuation is significant, and the maximum achievable speed drops well below 10 Mbps. This distance is likely beyond the optimal range for higher-speed DSL tiers.

Satellite internet often uses a different MTU size than terrestrial connections, and the default MTU of 1500 can cause fragmentation issues. Additionally, the router must be configured for the satellite provider's specific MTU (usually around 1400-1450) to avoid packet loss.

A cable tester (specifically a signal level meter or spectrum analyzer) can measure signal strength, SNR, and other parameters on coaxial cables used for cable internet and TV. A tone generator is for tracing wires, a multimeter is for electrical measurements, and an OTDR is for fiber optic cables.

Cable internet uses a shared medium, so bandwidth is divided among users in the same neighborhood, causing slowdowns during peak usage. DSL and fiber are typically dedicated lines, and satellite latency is constant. This is a common complaint with cable broadband.

DSL uses copper telephone lines that can degrade when moisture infiltrates the wiring or splices, leading to intermittent connectivity during rain. Unlike cable or fiber, DSL is particularly susceptible to weather-related signal loss due to aging infrastructure.

Satellite internet is available almost anywhere with a clear view of the sky, making it ideal for rural areas without wired infrastructure. Cable, DSL, and fiber all require physical infrastructure that may not reach remote locations.

Fixed wireless (using point-to-point or point-to-multipoint antennas) can provide reliable, low-latency connections in areas without wired infrastructure, often using licensed or unlicensed spectrum. Satellite has high latency, cellular can be inconsistent, and dial-up is too slow.

Fixed wireless access (FWA) uses a directional antenna to connect to a nearby tower, offering more stability than a mobile hotspot. Satellite has high latency, DSL requires phone lines, and cable requires coaxial. FWA is ideal for rural areas without wired options.

Fiber-optic offers the lowest latency due to light transmission and dedicated bandwidth, essential for real-time trading. Cable broadband has higher latency due to shared bandwidth and signal conversion. Fiber's physical properties make it superior for latency-sensitive applications.

Fixed wireless internet requires a clear line-of-sight between the customer's antenna and the provider's tower. Obstructions like trees or buildings can severely degrade or block the signal, making this the most important requirement.

After a power outage, cable modems often need to re-establish communication with the headend, which can take several minutes. The blinking online light indicates the modem is trying to sync with the provider's network, which is normal after a power loss.

Fiber optic internet provides the highest speeds and lowest latency among common connection types, making it ideal for cloud applications. While installation may require new cabling, it offers symmetrical speeds and minimal signal degradation over long distances.