JN0-649 Enterprise Routing and Switching, Professional Practice Questions
Prepare for JN0-649 with more than an answer.
- Exam fee
- $400 USD
- Level
- Professional
- Valid for
- 3 years
Domains covered on the exam 8
- Interior Gateway Protocols (IGPs)15%
- Border Gateway Protocol (BGP)20%
- IP Multicast15%
- Ethernet Switching and Spanning Tree12%
- Layer 2 Authentication and Access Control10%
- IP Telephony Features8%
- Class of Service (CoS)12%
- Ethernet VPN (EVPN)8%
- 1
Which address range is used for source-specific multicast?
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Correct answer: C
- 2
Which three configuration parameters must match on all switches within the same MSTP region? (Choose three.)
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Correct answer: A, B, C
- 3
Which two statements are correct about the deployment of EVPN-VXLAN on QFX Series devices? (Choose two.)
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Correct answer: C, D
- 4
Case Study:
A rapidly growing e-commerce company, 'GlobalCart', is expanding its network. They currently operate a single Autonomous System (AS 65001) with 20 routers in a full iBGP mesh. The network engineering team is struggling to manage the configuration complexity and the high number of TCP sessions. The company plans to add 30 more routers within the next year. All routers are in a single administrative domain and require full visibility of all external routes. The lead architect wants a solution that simplifies configuration, reduces the number of iBGP peerings, and avoids partitioning the AS into sub-ASes.
Which BGP scaling solution should the architect implement to meet these requirements?
graph TD subgraph AS65001 [Current Full Mesh (AS 65001)] R1 --- R2 R1 --- R3 R1 --- R4 R2 --- R3 R2 --- R4 R3 --- R4 R1 --- R20(...) R2 --- R20(...) R3 --- R20(...) R4 --- R20(...) end subgraph Future [Future Growth] R21(...) R50(...) end AS65001 --> FutureShow answer details
Correct answer: C
Route reflectors (RRs) are the ideal solution for this scenario. They solve the n(n-1)/2 peering problem of a full mesh by allowing routers to peer only with the RRs. This drastically simplifies configuration and reduces TCP session overhead. RRs operate within a single AS, meeting the requirement to avoid sub-ASes (which confederations would require). Deploying two RRs provides redundancy. While automation helps manage a full mesh, it doesn't solve the underlying scalability issue of numerous peerings. BGP add-path is for load balancing, not scaling the control plane.
