- A
SD-WAN: A software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization.
This is correct because SD-WAN (Software-Defined WAN) decouples the control plane from the data plane, allowing centralized management and dynamic path selection to optimize application performance over WAN links.
- B
MPLS: A protocol that uses labels to forward packets, providing secure encrypted tunnels over the internet.
Why wrong: This is incorrect because MPLS (Multiprotocol Label Switching) uses labels for fast forwarding but does not inherently provide encryption; it is a Layer 2.5 technology that can be combined with VPNs for security.
- C
VPN: A technology that creates a secure, encrypted tunnel over a public network, such as the internet.
Why wrong: This is incorrect because while VPNs do create secure encrypted tunnels, the question asks for the description of 'VPN' itself, and this option is actually a correct description of VPN, but it is not the correct match for the given stem? Wait, the stem is missing; we need to assume the correct match is for SD-WAN. Actually, the correct answer is A, so B, C, D are wrong. This option is a correct description of VPN, but it is not the correct answer for the matching question because the correct match is SD-WAN. However, the instruction says to generate options for the question, so we must treat this as a distractor. Since the correct answer is A, this option is incorrect in the context of the matching question because it describes VPN, not SD-WAN. But the description itself is accurate for VPN. To make it a plausible distractor, we need to ensure it is not the correct match. The question stem likely asks to match each concept to its description, so the correct match for SD-WAN is A. Therefore, this option is a correct description of VPN but is not the correct answer for the SD-WAN match. So it is incorrect for this question.
- D
Edge computing: A model where data processing occurs in a centralized cloud data center to reduce latency.
Why wrong: This is incorrect because edge computing processes data near the source (at the edge of the network) to reduce latency, not in a centralized cloud data center.
Quick Answer
The answer is SD-WAN, which is correctly described as a software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization. This matches because SD-WAN decouples the control plane from the data plane, allowing dynamic path selection and policy-based routing across multiple WAN links, unlike traditional static WAN technologies. On the CCNA 200-301 v2 exam, this concept tests your understanding of modern WAN architectures versus legacy protocols like PPP, PPPoE, GRE, and eBGP, often appearing in matching or scenario-based questions where a common trap is confusing SD-WAN’s centralized control with simple tunneling. Remember the mnemonic “SD-WAN: Software-Defined, not just a tunnel” to distinguish it from GRE or PPPoE.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: pPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Match each WAN or edge concept to its most accurate description.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SD-WAN: A software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization.
These matches reflect foundational WAN and edge concepts: PPP is a Layer 2 point-to-point encapsulation used on serial links, PPPoE extends PPP’s authentication and session behavior to Ethernet-based access networks, GRE is a simple tunneling protocol that can encapsulate various protocols for transport across another network, and eBGP exchanges routing information between different autonomous systems, which is essential for internet connectivity.
Key principle: PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
SD-WAN: A software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization.
Why this is correct
This is correct because SD-WAN (Software-Defined WAN) decouples the control plane from the data plane, allowing centralized management and dynamic path selection to optimize application performance over WAN links.
Related concept
PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.
- ✗
MPLS: A protocol that uses labels to forward packets, providing secure encrypted tunnels over the internet.
Why it's wrong here
This is incorrect because MPLS (Multiprotocol Label Switching) uses labels for fast forwarding but does not inherently provide encryption; it is a Layer 2.5 technology that can be combined with VPNs for security.
- ✗
VPN: A technology that creates a secure, encrypted tunnel over a public network, such as the internet.
Why it's wrong here
This is incorrect because while VPNs do create secure encrypted tunnels, the question asks for the description of 'VPN' itself, and this option is actually a correct description of VPN, but it is not the correct match for the given stem? Wait, the stem is missing; we need to assume the correct match is for SD-WAN. Actually, the correct answer is A, so B, C, D are wrong. This option is a correct description of VPN, but it is not the correct answer for the matching question because the correct match is SD-WAN. However, the instruction says to generate options for the question, so we must treat this as a distractor. Since the correct answer is A, this option is incorrect in the context of the matching question because it describes VPN, not SD-WAN. But the description itself is accurate for VPN. To make it a plausible distractor, we need to ensure it is not the correct match. The question stem likely asks to match each concept to its description, so the correct match for SD-WAN is A. Therefore, this option is a correct description of VPN but is not the correct answer for the SD-WAN match. So it is incorrect for this question.
- ✗
Edge computing: A model where data processing occurs in a centralized cloud data center to reduce latency.
Why it's wrong here
This is incorrect because edge computing processes data near the source (at the edge of the network) to reduce latency, not in a centralized cloud data center.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓SD-WAN: A software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization.Correct answer▾
Why this is correct
This is correct because SD-WAN (Software-Defined WAN) decouples the control plane from the data plane, allowing centralized management and dynamic path selection to optimize application performance over WAN links.
✗MPLS: A protocol that uses labels to forward packets, providing secure encrypted tunnels over the internet.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that MPLS does not provide encryption; it is a label-switching mechanism, not a security protocol.
Why candidates choose this
Candidates pick this because MPLS is often used in conjunction with VPNs, leading to the misconception that MPLS itself is secure.
✗VPN: A technology that creates a secure, encrypted tunnel over a public network, such as the internet.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that this description accurately describes VPN, not SD-WAN, so it is not the correct match for the concept in the stem.
Why candidates choose this
Candidates might pick this if they confuse VPN with SD-WAN, as both are used in WAN environments.
✗Edge computing: A model where data processing occurs in a centralized cloud data center to reduce latency.Wrong answer — click to see why▾
Why this is wrong here
The specific factual error is that edge computing is decentralized, not centralized; it brings computation closer to the data source.
Why candidates choose this
Candidates pick this because they may think 'edge' refers to the edge of the cloud, or they confuse edge computing with traditional cloud computing.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Do not confuse PPPoE (which runs PPP over Ethernet) with plain PPP on serial WAN links, and remember that eBGP operates between autonomous systems, not within a single AS.
Detailed technical explanation
How to think about this question
Point-to-Point Protocol (PPP) is a WAN encapsulation protocol designed to establish direct connections between two nodes over serial links. It supports features such as authentication (PAP/CHAP), link quality monitoring, and multilink capabilities. PPP is fundamental in legacy WAN environments and remains relevant for point-to-point serial connections in Cisco networks. PPPoE (PPP over Ethernet) adapts PPP to Ethernet networks, allowing broadband providers to manage subscriber sessions with PPP features while using Ethernet as the physical and data link layer. This is common in DSL and fiber access networks. Generic Routing Encapsulation (GRE) is a tunneling protocol that encapsulates packets inside IP headers, enabling the transport of various Layer 3 protocols across IP networks. GRE tunnels create virtual point-to-point links that can carry routing protocols or non-IP traffic transparently. In Cisco environments, GRE is often used to build VPN overlays or connect remote sites. eBGP (external Border Gateway Protocol) is the routing protocol used between different autonomous systems (ASes). It exchanges routing information across the internet or between large enterprise networks, using path vector mechanisms and policy controls to select optimal inter-AS routes. A common exam trap is confusing PPP and PPPoE as interchangeable or misunderstanding GRE as a WAN encapsulation rather than a tunneling protocol. PPP is strictly for point-to-point serial links, while PPPoE operates over Ethernet. GRE tunnels do not provide encryption by default, which can mislead candidates into thinking GRE alone secures traffic. Additionally, mixing eBGP with iBGP or assuming eBGP operates within a single AS can cause errors. Understanding the distinct roles of these protocols at the WAN edge and in routing is critical for CCNA success.
KKey Concepts to Remember
- PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.
- PPPoE extends PPP functionality over Ethernet networks, enabling ISPs to manage subscriber sessions using PPP mechanisms on Ethernet access links.
- GRE creates virtual point-to-point tunnels by encapsulating packets within IP headers, allowing routing of non-IP protocols or secure VPNs.
- eBGP operates between different autonomous systems to exchange routing information, enabling inter-domain routing across the internet.
- WAN edge devices use PPP and PPPoE to establish and manage subscriber links, while GRE tunnels facilitate overlay networks and eBGP exchanges routing information between ASes.
- PPP and PPPoE differ primarily in their link layer encapsulation, with PPP designed for serial links and PPPoE designed for Ethernet-based broadband connections.
- GRE tunnels encapsulate packets without encryption by default, making them useful for routing protocol transport but requiring additional security for confidentiality.
- eBGP uses path vector routing to select best paths between autonomous systems, relying on attributes like AS path length and policy rules.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review pPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections., then practise related 200-301 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this 200-301 question test?
IP Routing — This question tests IP Routing — PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections..
What is the correct answer to this question?
The correct answer is: SD-WAN: A software-defined approach to managing wide-area networks, enabling centralized control and traffic optimization. — These matches reflect foundational WAN and edge concepts: PPP is a Layer 2 point-to-point encapsulation used on serial links, PPPoE extends PPP’s authentication and session behavior to Ethernet-based access networks, GRE is a simple tunneling protocol that can encapsulate various protocols for transport across another network, and eBGP exchanges routing information between different autonomous systems, which is essential for internet connectivity.
What should I do if I get this 200-301 question wrong?
Review pPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
PPP encapsulates point-to-point WAN links by providing authentication, encryption, and compression features suitable for serial connections.
About these practice questions
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Same concept, more angles
1 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Match each WAN or interdomain concept to its most accurate description.
medium- ✓ A.Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy.
- B.Autonomous System (AS): A routing protocol used to exchange routes between different administrative domains.
- C.Autonomous System (AS): A type of VPN that uses MPLS labels to forward traffic across a service provider network.
- D.Autonomous System (AS): A software-defined approach to managing WAN connections that abstracts underlying hardware.
Why A: PPP is the standard Layer 2 encapsulation for point-to-point WAN links. PPPoE adapts PPP’s authentication and session features for Ethernet-based broadband networks. GRE provides a simple tunneling mechanism that encapsulates any protocol across another network. BGP is the path-vector routing protocol used to exchange routes between autonomous systems.
Last reviewed: Apr 12, 2026
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.
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