Layer 2 and Layer 3 Strategies JN0-281 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   What is an advantage of using BGP in a data center Layer 3 design?

   • AIt is simpler to configure than OSPF.
   • BIt provides scalability and policy-based routing control.
   • CIt does not require IP addressing.
   • DIt is only used for external routing.
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   Why is EBGP commonly used in IP fabric designs?

   • AIt is the only routing protocol that supports VXLAN.
   • BIt provides fast convergence and scalability in a spine-and-leaf topology.
   • CIt eliminates the need for IP addresses on switches.
   • DIt automatically configures VLANs on all switches.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A network engineer is troubleshooting a Layer 2 loop in a data center access layer. The network uses STP, but the engineer suspects that a switch is not running STP. What is the most likely consequence of a switch not running STP in this environment?

   • ABroadcast storms and MAC address flapping
   • BThe switch will automatically shut down all ports
   • CRouting loops between the access switches
   • DThe switch will not forward any traffic
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5. 24application · medium

   A data center currently runs a large Layer 2 domain with STP enabled. The network team is experiencing slow convergence during link failures and wants to reduce the blast radius of broadcast storms. They are considering either MC-LAG or moving to a Layer 3 IP fabric. Which approach best addresses both concerns while keeping the existing Layer 2 server connectivity?

   • AMove all servers to a single aggregation switch to eliminate the need for STP entirely.
   • BKeep STP enabled but increase the bridge priority on the aggregation switches to speed up convergence.
   • CEnable RSTP on all switches to improve convergence while keeping the large Layer 2 domain.
   • DDeploy MC-LAG between the access and aggregation switches to eliminate STP blocking and provide fast failover.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A network engineer is designing a new data center fabric using a spine-and-leaf topology. They want to use a routing protocol that supports ECMP for optimal bandwidth utilization and can scale to a large number of leaf switches. They also prefer a protocol that is simple to configure and does not require a separate IGP for the underlay. Which routing protocol should they choose?

   • AEBGP with a private ASN per leaf
   • BOSPF with all switches in a single area
   • CStatic routes with a default route to the spine
   • DRIP with hop-count metric
   Reveal Solution Discussion Select an answer first