The answer is a collection of networks and routers under common administrative routing control. This is the correct definition because an autonomous system, or AS, represents a single administrative domain where a consistent routing policy is applied, forming the fundamental boundary concept in BGP. In BGP, the AS number identifies this domain, allowing routers to make path decisions based on which AS a route traverses, rather than individual router hops. On the CCNA 200-301 v2 exam, this concept tests your understanding of BGP’s core purpose: routing between separate organizations. A common trap is confusing an AS with a single network or router; remember that an AS can contain many subnets and hundreds of routers, all managed by one entity. A helpful memory tip is to think of an AS as a “company campus” — one company controls the entire campus, even if it has many buildings and roads, and BGP treats that entire campus as a single routing unit.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: an autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.. 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.
What is an autonomous system in basic BGP terminology?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A collection of networks and routers under common administrative routing control
An autonomous system is a collection of IP networks and routers under a common routing policy or administrative control. In practical terms, it is the domain boundary concept used in BGP discussions. BGP uses AS concepts to reason about routing between separate administrative networks.
This is one of the first BGP ideas learners need to understand.
Key principle: An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A collection of networks and routers under common administrative routing control
Why this is correct
This is correct because that is the basic meaning of an autonomous system.
Related concept
An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.
✗
A single switch VLAN
Why it's wrong here
This is wrong because a VLAN is a Layer 2 segmentation concept, not an autonomous system.
When this WOULD be correct
If the question were about defining network segments within a local area network (LAN) and asked for a term that describes a logical grouping of devices managed by a single switch, then 'a single switch VLAN' would be the correct answer.
✗
A specific OSPF area inside one router
Why it's wrong here
This is wrong because an AS is not the same as an OSPF area.
When this WOULD be correct
If the question were to ask about the components of OSPF and how they relate to routing within a single organization, then 'a specific OSPF area inside one router' could be the correct answer, as it pertains to the organization of routing information within that context.
✗
A type of wireless access point
Why it's wrong here
This is wrong because an AS is a routing-domain concept.
When this WOULD be correct
If the exam question asked for the definition of a wireless access point or its types, then option D would be correct. For example, a question could ask, 'Which of the following is a type of device used to extend a wireless network?'
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.
✓A collection of networks and routers under common administrative routing controlCorrect answer▾
Why this is correct
This is correct because that is the basic meaning of an autonomous system.
✗A single switch VLANWrong answer — click to see why▾
Why this is wrong here
Option B is incorrect because a single switch VLAN does not represent an autonomous system, which is defined as a collection of networks and routers under a single administrative control in BGP terminology.
★ When this WOULD be the correct answer
If the question were about defining network segments within a local area network (LAN) and asked for a term that describes a logical grouping of devices managed by a single switch, then 'a single switch VLAN' would be the correct answer.
Why candidates choose this
Candidates may confuse the concept of an autonomous system with simpler network configurations, such as VLANs, leading them to select this option due to familiarity with basic networking concepts.
✗A specific OSPF area inside one routerWrong answer — click to see why▾
Why this is wrong here
Option C is incorrect because an OSPF area is a logical grouping of routers that share link-state information, not an autonomous system, which encompasses multiple networks and routers under a single administrative control.
★ When this WOULD be the correct answer
If the question were to ask about the components of OSPF and how they relate to routing within a single organization, then 'a specific OSPF area inside one router' could be the correct answer, as it pertains to the organization of routing information within that context.
Why candidates choose this
Candidates may choose this option due to confusion between routing protocols and their components, leading them to associate OSPF areas with broader routing concepts like autonomous systems.
✗A type of wireless access pointWrong answer — click to see why▾
Why this is wrong here
Option D is incorrect because an autonomous system in BGP terminology refers to a collection of networks and routers, not a type of wireless access point, which is a completely different networking concept.
★ When this WOULD be the correct answer
If the exam question asked for the definition of a wireless access point or its types, then option D would be correct. For example, a question could ask, 'Which of the following is a type of device used to extend a wireless network?'
Why candidates choose this
Candidates may choose this option due to a misunderstanding of networking terminology, confusing BGP concepts with wireless networking devices, especially if they have encountered both topics in their studies.
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
A frequent exam trap is mistaking an autonomous system for a VLAN or an OSPF area. VLANs are Layer 2 broadcast domains and do not relate to routing domains or administrative control of routing policies. Similarly, OSPF areas segment a single routing domain to optimize routing but do not represent separate administrative entities. Confusing these concepts can lead to incorrect answers because BGP’s autonomous system concept specifically refers to a collection of networks and routers under a common administrative routing policy, which is distinct from VLAN or OSPF area segmentation.
Detailed technical explanation
How to think about this question
An autonomous system (AS) in BGP terminology is a collection of IP networks and routers under a single administrative entity that shares a common routing policy. This concept is fundamental to BGP because it allows the protocol to manage routing between different administrative domains rather than within a single network. Each AS is assigned a unique AS number (ASN) that identifies it globally on the Internet or within private networks using BGP.
BGP uses the AS concept to make routing decisions based on policies rather than just shortest path metrics. When BGP routers exchange routing information, they include the AS path attribute, which lists the AS numbers a route has traversed. This helps prevent routing loops and enforces routing policies between different autonomous systems. Cisco devices running BGP rely on this AS structure to control route advertisement and selection.
A common exam trap is confusing an autonomous system with other network segmentation concepts like VLANs or OSPF areas. Unlike VLANs, which segment Layer 2 domains, or OSPF areas, which segment a single routing domain, an AS represents an entire routing domain under one administrative control. Practically, this means BGP peers are established between routers in different ASes, not within the same AS, which is a key distinction for CCNA-level understanding.
KKey Concepts to Remember
An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.
BGP uses autonomous system numbers (ASNs) to identify and differentiate routing domains globally or privately.
The AS path attribute in BGP lists the sequence of autonomous systems a route has traversed to prevent routing loops.
BGP peers establish connections between routers in different autonomous systems, not within the same AS.
VLANs segment Layer 2 broadcast domains and do not represent autonomous systems or routing domains.
OSPF areas segment a single routing domain internally and are not equivalent to autonomous systems.
An autonomous system defines the boundary for routing policy enforcement in BGP inter-domain routing.
Understanding the distinction between AS, VLAN, and OSPF area is critical to correctly answering BGP-related questions.
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
An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review an autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control..
What is the correct answer to this question?
The correct answer is: A collection of networks and routers under common administrative routing control — An autonomous system is a collection of IP networks and routers under a common routing policy or administrative control. In practical terms, it is the domain boundary concept used in BGP discussions. BGP uses AS concepts to reason about routing between separate administrative networks.
This is one of the first BGP ideas learners need to understand.
What should I do if I get this 200-301 question wrong?
Review an autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
An autonomous system groups multiple IP networks and routers under one administrative routing policy for BGP routing control.
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