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ENCOR Question Bank, Part 1 (Domains 1 to 3)

55 original questions covering ENCOR 350-401 v1.2 domains 1.0 Architecture, 2.0 Virtualization and 3.0 Infrastructure. Answer each question before you open its explanation, and log every miss by the blueprint number shown under the question. Target: 44 of 55 (80%).

1.0 Architecture

1. Blueprint 1.1

In a three-tier campus design, which two functions belong at the distribution layer? (Choose two.)

  • A. Connecting end-user devices and IP phones
  • B. Summarizing routes and applying policy for the access blocks below it
  • C. Supplying PoE to wireless access points
  • D. Providing high-speed transport between buildings with no policy applied
  • E. Acting as the boundary between Layer 2 access VLANs and routed uplinks
Answer: B, E

The distribution layer aggregates access switches, is usually the Layer 2 to Layer 3 boundary in a traditional design, and is where route summarization and policy are applied so that changes in one access block do not ripple through the network. Connecting endpoints and supplying PoE (A and C) are access-layer jobs. Fast transport with minimal policy (D) describes the core.

2. Blueprint 1.1

Refer to the exhibit. VLAN 10 is trunked from both access switches to both distribution switches, and DS1 and DS2 are joined by a Layer 2 trunk. DS1 is the HSRP active router for VLAN 10. DS2 is the spanning-tree root bridge for VLAN 10.

graph TB
  DS1["DS1 HSRP active VLAN 10"] --- DS2["DS2 STP root VLAN 10"]
  DS1 --- AS1
  DS2 --- AS1
  DS1 --- AS2
  DS2 --- AS2

Users on AS1 report higher latency than expected. Which change aligns the Layer 2 and Layer 3 forwarding paths?

  • A. Make DS1 the spanning-tree root bridge for VLAN 10 so that it matches the HSRP active router
  • B. Enable PortFast on the AS1 uplinks
  • C. Configure HSRP preemption on DS2 only
  • D. Change the HSRP version from 1 to 2
Answer: A

With DS2 as root, each access switch forwards on its uplink to DS2 and blocks the uplink to DS1. Traffic from AS1 to the gateway therefore goes AS1 to DS2, then across the inter-distribution link to DS1. The fix is to put the STP root and the HSRP active role on the same switch for each VLAN, for example with spanning-tree vlan 10 root primary on DS1. PortFast (B) is for edge ports and must never be used on uplinks. Preemption on DS2 alone (C) does nothing without a higher priority, and the HSRP version (D) does not affect the path.

3. Blueprint 1.1

A router with dual route processors runs SSO with NSF. The active route processor fails. What must be true of the router's OSPF neighbors for traffic to keep flowing without the adjacencies resetting?

  • A. They must also have dual route processors
  • B. They must be NSF-aware (graceful restart helper capable)
  • C. They must be in a different OSPF area
  • D. They must run HSRP with the failing router
Answer: B

During an NSF restart the data plane keeps forwarding from the existing FIB while the new active RP rebuilds its routing state. The neighbors must act as graceful restart helpers and keep the adjacency up instead of tearing it down. They do not need redundant hardware themselves (A). HSRP (D) protects the gateway across separate routers and is unrelated. Area placement (C) has no effect.

4. Blueprint 1.1

Match each cloud service model to the statement that describes it.

Statement Service model
The provider runs the application; the customer only uses it and manages its own data and users ?
The provider supplies virtual machines, storage and networking; the customer installs and patches the operating system ?
The provider manages the OS and runtime; the customer deploys its own application code ?

Choices: IaaS, PaaS, SaaS

Answer

Application consumed as a service: SaaS. Virtual machines with a customer-managed OS: IaaS. Managed runtime where the customer brings code: PaaS. The easy way to remember it is to ask where the customer's responsibility stops: at the OS for IaaS, at the application for PaaS, and at the data for SaaS.

5. Blueprint 1.1

Which two statements describe a spine-leaf fabric? (Choose two.)

  • A. Every leaf connects to every spine
  • B. Leaf switches connect directly to each other for redundancy
  • C. Any two endpoints on different leaves are the same number of hops apart
  • D. Spine switches connect to servers and other endpoints
  • E. Spanning tree blocks all but one spine uplink on each leaf
Answer: A, C

In a spine-leaf design each leaf has an uplink to every spine, and nothing else connects to the spines. That makes leaf-to-leaf paths a consistent leaf, spine, leaf, which gives predictable latency. Leaves do not connect to each other (B), endpoints attach to leaves (D), and the uplinks are normally Layer 3 with ECMP, so spanning tree is not blocking them (E).

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