- A
Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy.
This is correct because an AS is defined as a group of networks under a single administrative control, using a common routing policy. It is the fundamental unit for inter-domain routing.
- B
Autonomous System (AS): A routing protocol used to exchange routes between different administrative domains.
Why wrong: This is incorrect because an AS is not a routing protocol; it is a collection of networks. The protocol used between ASes is BGP.
- C
Autonomous System (AS): A type of VPN that uses MPLS labels to forward traffic across a service provider network.
Why wrong: This is incorrect because an AS is not a VPN technology. MPLS VPNs use labels but are not synonymous with an AS.
- D
Autonomous System (AS): A software-defined approach to managing WAN connections that abstracts underlying hardware.
Why wrong: This is incorrect because an AS is not a software-defined WAN (SD-WAN) technology. SD-WAN is a separate concept that uses software to manage WAN connections.
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 data on point-to-point WAN links and supports features like authentication and error detection.. 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 interdomain 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
Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy.
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.
Key principle: PPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy.
Why this is correct
This is correct because an AS is defined as a group of networks under a single administrative control, using a common routing policy. It is the fundamental unit for inter-domain routing.
Related concept
PPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection.
- ✗
Autonomous System (AS): A routing protocol used to exchange routes between different administrative domains.
Why it's wrong here
This is incorrect because an AS is not a routing protocol; it is a collection of networks. The protocol used between ASes is BGP.
- ✗
Autonomous System (AS): A type of VPN that uses MPLS labels to forward traffic across a service provider network.
Why it's wrong here
This is incorrect because an AS is not a VPN technology. MPLS VPNs use labels but are not synonymous with an AS.
- ✗
Autonomous System (AS): A software-defined approach to managing WAN connections that abstracts underlying hardware.
Why it's wrong here
This is incorrect because an AS is not a software-defined WAN (SD-WAN) technology. SD-WAN is a separate concept that uses software to manage WAN connections.
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.
✓Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy.Correct answer▾
Why this is correct
This is correct because an AS is defined as a group of networks under a single administrative control, using a common routing policy. It is the fundamental unit for inter-domain routing.
✗Autonomous System (AS): A routing protocol used to exchange routes between different administrative domains.Wrong answer — click to see why▾
Why this is wrong here
Confuses the concept of an AS with the protocol (BGP) that operates between ASes.
Why candidates choose this
Candidates often associate AS with BGP and may think AS itself is a protocol.
✗Autonomous System (AS): A type of VPN that uses MPLS labels to forward traffic across a service provider network.Wrong answer — click to see why▾
Why this is wrong here
Misattributes MPLS VPN characteristics to the definition of an AS.
Why candidates choose this
Candidates may confuse AS with MPLS VPNs because both are used in service provider networks.
✗Autonomous System (AS): A software-defined approach to managing WAN connections that abstracts underlying hardware.Wrong answer — click to see why▾
Why this is wrong here
Confuses the definition of an AS with SD-WAN, which is a different technology.
Why candidates choose this
Candidates may mix up terms like 'autonomous' and 'software-defined' because both involve management abstraction.
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
Learners often mistake PPPoE as merely PPP over Ethernet media, overlooking that it establishes a distinct PPP session; similarly, they may treat GRE as a secured VPN when it is only a tunnel, and confuse BGP’s interdomain role with an IGP like OSPF.
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. It provides features like authentication, compression, and error detection, making it suitable for serial links. PPPoE (PPP over Ethernet) extends PPP functionality to Ethernet networks, enabling ISPs to manage subscriber sessions over broadband access by encapsulating PPP frames within Ethernet frames. Generic Routing Encapsulation (GRE) is a tunneling protocol that encapsulates a wide variety of network layer protocols inside virtual point-to-point links. GRE tunnels allow the transport of packets across incompatible networks or through intermediate routers that do not support the original protocol. Border Gateway Protocol (BGP) is a path-vector interdomain routing protocol used to exchange routing information between autonomous systems on the internet, making it essential for WAN edge routing and policy-based routing decisions. Understanding these protocols' distinct roles is critical in Cisco networking. PPP and PPPoE focus on link-layer encapsulation for WAN access, GRE provides a mechanism to tunnel traffic across diverse networks, and BGP governs routing policies between large networks. Misclassifying these can lead to configuration errors or routing issues in practical deployments, highlighting the importance of precise protocol knowledge for CCNA candidates.
KKey Concepts to Remember
- PPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection.
- PPPoE encapsulates PPP frames within Ethernet frames to enable PPP functionality over broadband Ethernet access networks.
- GRE creates virtual point-to-point tunnels by encapsulating packets, allowing transport of diverse protocols across incompatible networks.
- BGP operates as a path-vector protocol exchanging routing information between autonomous systems, enabling interdomain routing.
- PPP and PPPoE focus on link-layer encapsulation, while GRE provides tunneling at the network layer for protocol transport.
- BGP uses path attributes and policies to select optimal routes between autonomous systems, differing fundamentally from interior routing protocols.
- GRE tunnels do not provide encryption by default, distinguishing them from VPN protocols that secure WAN traffic.
- Misunderstanding the scope of BGP as an interdomain protocol versus PPP as a WAN encapsulation can cause configuration and conceptual errors.
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 data on point-to-point WAN links and supports features like authentication and error detection.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review pPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection., 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 data on point-to-point WAN links and supports features like authentication and error detection..
What is the correct answer to this question?
The correct answer is: Autonomous System (AS): A collection of networks under a single administrative domain with a unified routing policy. — 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.
What should I do if I get this 200-301 question wrong?
Review pPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
PPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection.
About these practice questions
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Last reviewed: May 17, 2026
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