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WAN Technologies for CompTIA Network+ N10-009

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.

9 min

3 sections · 7 exam key points

2 practice questions

Traditional WAN Technologies

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.

Broadband and Modern WAN Options

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.

Modern WAN Architecture: SD-WAN

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.

WAN Technology Comparison

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)

Key exam facts — Network+

T1 = 1.544 Mbps, 24 DS0 channels; T3 = 44.736 Mbps, 28 T1s
MPLS uses labels to forward packets — enables QoS and traffic engineering
ADSL = asymmetric (faster download), SDSL = symmetric (equal up/down)
DSL performance degrades with distance from the CO
SD-WAN centralizes WAN management and dynamically selects the best path
Satellite WAN has very high latency — problematic for real-time applications
Metro Ethernet extends Ethernet technology across a city — carrier-grade fiber

Common exam traps

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

Practice questions — WAN Technologies

These questions are representative of what you will see on Network+ exams. The correct answer and explanation are shown immediately below each question.

Q1.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?

A.Frame Relay

B.SD-WAN

C.T3 leased lines

D.ISDN

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.

Q2.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?

A.MPLS

B.ADSL

C.Metro Ethernet

D.T1

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.

Frequently asked questions — WAN Technologies

Is MPLS still relevant for Network+ studies?

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.

What WAN technologies are considered legacy on the Network+ exam?

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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