IP Fabric Architectures (Spine/Leaf) JN0-281 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the overlay network in a spine-leaf architecture?

   • AThe network that connects the data center to the internet.
   • BThe physical cabling and switches that form the fabric.
   • CThe logical network, such as VXLAN, that provides tenant isolation and virtual networks.
   • DThe routing protocol used to exchange routes between switches.
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2. 17expert · hard

   A network engineer is troubleshooting a performance issue in a spine-leaf fabric. The fabric has 6 spines and 20 leaves. Traffic between two specific servers is consistently using only one spine, while other spines are underutilized. The engineer suspects an ECMP hashing issue. Which action is most likely to resolve the problem?

   • AChange the ECMP hash algorithm to use a different set of fields, such as source and destination IP addresses and Layer 4 ports.
   • BRemove one of the spines from the fabric to reduce the number of ECMP paths.
   • CIncrease the MTU on the spine switches to allow for larger packets.
   • DConfigure the leaf switches to use a single spine for all traffic to ensure consistent performance.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   What is the underlay network in a spine-leaf architecture?

   • AThe management network used to configure switches.
   • BThe physical IP fabric that provides connectivity between switches.
   • CThe virtual network created by virtual machines.
   • DThe logical network that provides tenant isolation, such as VXLAN.
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5. 19application · medium

   A data center operator currently runs a three-tier network and is experiencing unpredictable latency and throughput as server-to-server traffic grows. They are considering migrating to a spine-leaf architecture. The primary business driver is the ability to add capacity incrementally without redesigning the network. Which property of spine-leaf directly satisfies this requirement?

   • AAll leaf switches must be connected in a ring topology to allow for future expansion without adding new spine ports.
   • BThe network team must pre-install all cabling for the maximum possible fabric size, even if switches are not initially deployed.
   • CAdding a new leaf switch requires connecting it to every spine, and adding a new spine requires connecting it to every leaf, with no change to the existing cabling.
   • DThe fabric can be expanded by replacing existing spine switches with higher-capacity models, which requires recabling all leaf switches.
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6. 20application · medium

   A service provider is building a multi-tenant data center fabric. They need to isolate tenant traffic while using a shared physical network. The design uses VXLAN to create logical networks. In this architecture, which statement correctly describes the role of the spine and leaf switches?

   • ALeaf switches act as VXLAN tunnel endpoints (VTEPs) and handle tenant traffic, while spine switches provide the IP underlay connectivity between VTEPs.
   • BSpine switches are responsible for learning all MAC addresses of all tenants to make forwarding decisions.
   • CBoth spine and leaf switches must be configured with all tenant VLANs and VXLAN VNIs to forward traffic correctly.
   • DSpine switches perform VXLAN routing and encapsulation, while leaf switches only forward traffic based on the outer IP header.
   Reveal Solution Discussion Select an answer first