Which Two Technologies Are Categorized as Private WAN Infrastructures? (Choose Two.)
Introduction To Cisco 200-301 Official Cert Guide
A Wide Area Network (WAN) connects geographically dispersed networks, enabling businesses to link offices across cities or countries. Unlike Local Area Networks (LANs), WANs rely on service providers and various transmission technologies.
The word private in this context describes who the infrastructure serves, not whether your own company owns the cables. A private WAN carries one organization's traffic across a provider's network in a way that keeps it separated from everyone else's: the capacity is provisioned for you, the path stays inside the provider's controlled network, and your traffic never mixes with public Internet traffic. That separation is what the exam is testing when it asks you to categorize WAN technologies.
WAN infrastructures can be categorized as:
- Public WANs (Internet-based, less secure, e.g., VPN over Internet)
- Private WANs (Dedicated connections, more secure, e.g., MPLS, Leased Lines)
- For the Cisco 200-301 exam, knowing the difference is essential.
- Public vs. Private WAN Infrastructures
Public WANs
- Use shared infrastructure (Internet)
- Less expensive but less secure
- Examples: Broadband, 4G/5G, Public VPNs
Private WANs
- Use dedicated connections
- More secure and reliable
- Higher cost but better performance
- Examples: MPLS, Leased Lines
- The Cisco 200-301 Official Cert Guide emphasizes private WANs for enterprise-grade reliability.
Two Key Private WAN Technologies
The two main private WAN technologies — see also the two key technologies for private WAN infrastructures — are:
- A. MPLS (Multiprotocol Label Switching)
- Uses labels to route traffic efficiently
- Provides Quality of Service (QoS) for critical applications
- Used by enterprises for secure inter-office connectivity
Why MPLS is Private:
- Traffic does not traverse the public Internet
- Service providers offer dedicated paths
How MPLS Actually Moves Traffic
Instead of making a full routing decision at every hop, an MPLS provider network attaches a short label to each packet as it enters at the provider edge. Core routers then forward purely by swapping labels along a pre-built label-switched path, which keeps forwarding fast and predictable. In the common Layer 3 VPN service built on top of MPLS, each customer's routes are kept in a separate routing table on the provider edge routers, so one customer's traffic can never leak into another's. The provider can also mark traffic classes along the path, which is how voice and video get priority treatment end to end — something best-effort Internet transport cannot promise.
Leased Lines (T1/E1, T3/E3, etc.)
- Point-to-point dedicated connections
- Fixed bandwidth with guaranteed uptime
- Common in enterprises requiring stable connectivity
Why Leased Lines are Private:
- No sharing with other customers
- Secure and predictable performance
A leased line is the oldest private WAN design and still the easiest to picture: the provider provisions a dedicated point-to-point circuit between two of your sites, and every bit of its bandwidth is yours around the clock, whether you use it or not. Classic capacities come from the carrier hierarchies — a T1 delivers 1.544 Mbps and an E1 2.048 Mbps, with T3/E3 lines bundling many of those channels together — while modern leased services are usually delivered over Ethernet hand-offs at much higher rates. Because nothing is shared, latency and throughput stay constant, and the provider backs the circuit with a service-level agreement.
The two private options differ in topology and economics, even though the exam groups them together:
| Characteristic | MPLS | Leased Line |
|---|---|---|
| Topology | Any-to-any (full mesh through the provider cloud) | Point-to-point between two sites |
| Forwarding | Label switching across the provider core | Dedicated circuit, no sharing |
| Bandwidth | Provisioned per site, scalable | Fixed by the circuit you lease |
| QoS | Provider classes of service across the WAN | All capacity is yours, so no contention |
| Best fit | Many branch offices that all need to reach each other | Two sites needing a simple, predictable link |
These technologies are heavily covered in the Cisco 200-301 Official Cert Guide as core private WAN solutions.
Why These Technologies Are Considered Private
- No Public Internet Exposure: Traffic stays within the provider’s network.
- Dedicated Bandwidth: No contention with other users.
- Higher Security: Reduced risk of eavesdropping.
The Cisco 200-301 exam tests your ability to distinguish these from public alternatives.
|
Feature |
MPLS / Leased Lines (Private) |
Internet VPN (Public) |
|
Security |
High (Dedicated paths) |
Lower (Encryption-dependent) |
|
Reliability |
Guaranteed SLAs |
Best-effort delivery |
|
Cost |
Higher |
Lower |
|
Performance |
Consistent |
Variable |
Understanding this comparison is vital for the Cisco 200-301 exam.
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At Study4Pass, we provide:
- Detailed Exam Guides (Aligned with Cisco 200-301 Official Cert Guide)
- Practice Questions (Including WAN technology comparisons)
- Hands-on Labs (For real-world understanding)
Our resources ensure you grasp private vs. public WAN infrastructures effectively.
Exam Traps: Options That Are Not Private WANs
The distractors in this question family are almost always public-infrastructure options, and one of them catches people out every time. DSL, cable broadband, and 4G/5G services all ride shared, public access networks, so they are public WAN infrastructures no matter how a business uses them. The real trap is the VPN: a site-to-site VPN encrypts your traffic, but the tunnel still crosses the public Internet, so a VPN over the Internet counts as a public WAN infrastructure with security added — not a private one. Encryption changes who can read the traffic; it does not change whose infrastructure carries it. When a question asks which technologies are categorized as private, look for the answers whose traffic stays off the public Internet entirely: MPLS and leased lines.
Related guides
- Which two WAN infrastructure services are examples of private connections?
- What are two security features commonly found in a WAN design?
Official source: Cisco Learning Network – CCNA
Conclusion
MPLS (Multiprotocol Label Switching) and Leased Lines are the two key private WAN technologies. These technologies offer dedicated, secure, and reliable connectivity, making them ideal for enterprises. For more in-depth Cisco Certification CCNA (200-301) preparation, refer to the "Cisco 200-301 Official Cert Guide" and leverage Study4Pass for expert training materials.
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Sample Questions for Cisco 200-301 Exam Prep Practice Tests
Actual exam question from Cisco's 200-301 Exam
Which command is used to verify the status of VLANs and the ports assigned to them on a Cisco switch?
A) show vlan
B) show ip interface brief
C) show running-config
D) show cdp neighbors