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Advanced Enterprise Campus Practice Questions

15 original scenario questions covering ENSLD 2.1 to 2.5. Answer every one before opening any explanation. Target: 12 of 15 (80%).

1. A design requires that voice calls survive the loss of a distribution switch with under a second of disruption. Which design change helps most to meet the target with HSRP gateways? Blueprint 2.1.a

  • A. Keep the default HSRP timers and add a third gateway
  • B. Disable preemption so that no second failover occurs
  • C. Move to GLBP and rely on host load balancing
  • D. Use millisecond HSRP timers together with BFD for HSRP
Answer: D

Default HSRP timers need up to 10 seconds to detect a dead active router. Millisecond timers and BFD detect failure much faster. A third gateway does not change detection time, GLBP has the same failure detection issue, and disabling preemption does not speed up the first failover.

2. Hosts in VLAN 20 are slow even though both distribution switches are up. The HSRP active router for VLAN 20 is Dist 2, and the STP root for VLAN 20 is Dist 1. What is the most likely cause? Blueprint 2.1.a

  • A. HSRP and STP roots are misaligned, so frames cross the inter-distribution link
  • B. BFD is configured with a short interval
  • C. The VLAN uses VRRP instead of HSRP
  • D. Graceful restart is enabled on both switches
Answer: A

Hosts reach the STP root first, but the gateway is on the other switch, so traffic crosses the link between the distribution switches. The fix is to align the roles. The other options do not describe a path problem.

3. A company wants to remove blocked spanning tree uplinks and the need for an FHRP in a building. It accepts that both distribution chassis share one control plane. Which design fits? Blueprint 2.1.b

  • A. Two independent distribution switches with HSRP
  • B. GLBP on both distribution switches
  • C. StackWise Virtual on the distribution pair with multichassis EtherChannel to access
  • D. Rapid PVST+ with root guard on all ports
Answer: C

A virtual switch pair presents one logical switch, so the access layer uses a single bundle with no blocked links and one gateway. A and B keep separate gateways. D keeps blocked ports. Dual-active detection should be configured to guard against split-brain.

4. During a supervisor switchover on a core switch, its OSPF neighbours reset their adjacencies and traffic is lost for several seconds. The switch has dual supervisors with SSO. What is missing? Blueprint 2.1.c

  • A. NSF with graceful restart (or NSR) and helper support on neighbours
  • B. A third supervisor
  • C. A shorter OSPF dead interval
  • D. Spanning tree PortFast
Answer: A

SSO synchronises the standby but does not by itself keep routing adjacencies. Graceful restart or NSR lets neighbours hold routes during the switchover. A shorter dead interval makes the problem worse.

5. A network team enables aggressive BFD on every link and graceful restart on every neighbour. During supervisor switchovers sessions still drop. Which statement best explains this? Blueprint 2.1.d

  • A. BFD only works with static routes
  • B. BFD increases the OSPF dead interval
  • C. Graceful restart requires a larger MTU
  • D. A BFD session that cannot survive the switchover declares the neighbour down and defeats graceful restart
Answer: D

If BFD runs in the control plane and stops during the switchover, the peer sees failure and tears down the session, so the helper discards the routes. Either use a platform where BFD survives the switchover, or do not use BFD on those pairs.

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