Wide Area Network (WAN) technologies connect geographically dispersed sites and are tested on CompTIA Network+ N10-009 across multiple domains. You must identify WAN technology types, their characteristics, speeds, use cases, and common terminology. Network+ N10-009 emphasizes modern WAN technologies including MPLS, SD-WAN, broadband options, and cellular — alongside legacy technologies that still appear on the exam.
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Leased lines (T1/E1, T3/E3) provide dedicated point-to-point connections with guaranteed bandwidth. A T1 carries 24 DS0 channels at 1.544 Mbps. A T3 = 28 T1s = 44.736 Mbps. E1 (European equivalent) = 2.048 Mbps. Leased lines are expensive but offer consistent, private connectivity — used for critical site-to-site links.
MPLS (Multiprotocol Label Switching) is a packet-forwarding technology that uses labels rather than IP addresses to route traffic, enabling high-speed forwarding and traffic engineering. MPLS networks create a managed private WAN where the provider guarantees SLAs for latency, jitter, and packet loss. Widely used by enterprises for site-to-site connectivity with QoS support.
Frame Relay and ATM are legacy packet-switched WAN technologies still mentioned in exam objectives but rarely deployed today. Frame Relay used virtual circuits (PVCs and SVCs); ATM used fixed 53-byte cells optimized for voice and video.
DSL (Digital Subscriber Line) uses existing telephone lines. ADSL (Asymmetric DSL) provides faster download than upload — typical for residential and SOHO. SDSL (Symmetric DSL) offers equal upload and download — used for business. VDSL offers higher speeds over shorter distances. DSL speeds and quality degrade with distance from the central office (CO).
Cable broadband uses the cable television (CATV) infrastructure with DOCSIS (Data Over Cable Service Interface Specification). Shared medium — bandwidth is split among subscribers in the neighborhood. Faster than DSL in most deployments; DOCSIS 3.1 supports multi-gigabit speeds.
Fiber optic WAN (Metro Ethernet, FTTH/FTTP) provides the highest speeds and lowest latency. Fiber is used in carrier networks and increasingly brought to business premises. Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) are the carrier-grade fiber standards.
Cellular/wireless WAN: 4G LTE provides 10–100 Mbps; 5G can exceed 1 Gbps. Used for remote sites, branch offices, and backup WAN connections. Satellite WAN has high latency (600ms+ geostationary) but covers remote areas; LEO satellite (Starlink) dramatically reduces latency.
SD-WAN (Software-Defined WAN) decouples WAN management from the underlying transport, allowing centralized policy control over multiple connection types (MPLS, broadband, LTE). SD-WAN dynamically routes traffic over the best available path based on real-time performance metrics — critical applications go over MPLS, bulk traffic over broadband.
SD-WAN key benefits: cost reduction (replacing expensive MPLS with broadband), centralized management via a controller, application-aware routing, automatic failover, and end-to-end encryption over any transport. The Network+ exam tests SD-WAN as a current WAN technology alongside MPLS and broadband.
| Technology | Type | Typical Speed | Key Characteristic |
|---|---|---|---|
| T1 Leased Line | Dedicated | 1.544 Mbps | Guaranteed bandwidth, expensive |
| MPLS | Managed packet | 10 Mbps–10 Gbps | Label-based, SLA-guaranteed, QoS |
| ADSL | Broadband | 1–24 Mbps down | Asymmetric, distance-limited |
| Cable (DOCSIS) | Broadband | 100 Mbps–1+ Gbps | Shared medium |
| Fiber/Metro Ethernet | Dedicated | 1 Mbps–100 Gbps | Lowest latency, highest speed |
| 4G LTE | Cellular | 10–100 Mbps | Mobile, good coverage |
| 5G | Cellular | 100 Mbps–1+ Gbps | Ultra-low latency, high density |
| SD-WAN | Overlay | Varies by transport | Centralized management, path selection |
| Satellite (GEO) | Wireless | 25–100 Mbps | High latency (500–600ms) |
MPLS is the same as the internet
MPLS is a managed private WAN service where the carrier controls routing — traffic stays on the provider's network with guaranteed SLAs, unlike the public internet
SD-WAN replaces MPLS connectivity
SD-WAN is an overlay that manages multiple WAN connections; many organizations use SD-WAN to intelligently combine MPLS, broadband, and LTE rather than eliminating MPLS entirely
5G only applies to mobile phones
5G is also used for fixed wireless access (FWA) providing home and business internet, and as a WAN backup connection for enterprise sites
These questions are representative of what you will see on Network+ exams. The correct answer and explanation are shown immediately below each question.
A company has multiple branch offices connected via MPLS and wants to reduce WAN costs while maintaining application performance visibility and centralized management. Which technology should be deployed?
Explanation: SD-WAN reduces WAN costs by enabling branches to use lower-cost broadband alongside or instead of expensive MPLS, while providing centralized management and application-aware routing. Frame Relay is legacy. T3 leased lines are more expensive than MPLS. ISDN is obsolete.
Which WAN technology uses the existing telephone copper infrastructure but provides faster speeds than a standard POTS line, with download speeds typically faster than upload?
Explanation: ADSL (Asymmetric Digital Subscriber Line) runs over existing telephone copper wiring with asymmetric bandwidth — faster download than upload. MPLS is a managed packet WAN. Metro Ethernet uses fiber. T1 is a dedicated leased line.
Yes. MPLS is explicitly listed in the Network+ N10-009 exam objectives and remains widely deployed in enterprise networks. You need to understand what MPLS does (label-based forwarding, QoS, managed WAN) and how it differs from internet-based connectivity. It is being supplemented or replaced by SD-WAN in many organizations, but knowing both is required.
Legacy WAN technologies that still appear on Network+ include: Frame Relay (virtual circuits, PVC/SVC), ATM (fixed 53-byte cells), ISDN (BRI/PRI), and analog modem (POTS). You need to recognize them and their characteristics, but they are rarely deployed today.
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