Question 1mediummatching
Full question →Match each WAN or interdomain concept to its most accurate description.
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mediummatchingObjective-mapped
Match each WAN or interdomain concept to its most accurate description.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is confusing the roles of WAN encapsulation protocols like PPP and tunneling protocols like GRE. Candidates often mistake PPPoE as a tunneling protocol rather than a method to encapsulate PPP frames over Ethernet. Another trap is assuming BGP is a LAN routing protocol, while it actually operates between autonomous systems at the interdomain level. Misunderstanding these distinctions can lead to incorrect matching of concepts to their descriptions, especially under time pressure.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
PPP encapsulates data on point-to-point WAN links and supports features like authentication and error detection.
What exam trap should I watch out for?
Common exam trap: answer the scenario, not the keyword: A common exam trap is confusing the roles of WAN encapsulation protocols like PPP and tunneling protocols like GRE. Candidates often mistake PPPoE as a tunneling protocol rather than a method to encapsulate PPP frames over Ethernet. Another trap is assuming BGP is a LAN routing protocol, while it actually operates between autonomous systems at the interdomain level. Misunderstanding these distinctions can lead to incorrect matching of concepts to their descriptions, especially under time pressure.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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