ACE-L7 Sample Questions

ACE-L7 Sample Questions & Answers

Data center architecture ties with campus networking for the biggest share, ahead of MPLS WAN routing tied with network automation, and the smallest portion on EOS plus the basics of routing at Layer 2 and Layer 3.

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Free ACE-L7 Sample Questions with Answers

Real questions from the Arista Certified Engineer Level 7 - Expert practice test — answers and explanations included. Showing 4 of 8 free samples.

  1. Question 1Beginner

    Network Foundations · LACP and MLAG

    A junior engineer is configuring an MLAG domain between two Arista 7050X3 switches. They are confused about the difference between the MLAG peer-link and the MLAG peer-address. What is the correct technical distinction between these two configurations?

    Show answer & explanation

    Correct answer: B

    In an Arista MLAG setup, the peer-link (usually a port-channel) is the physical/logical path that carries data traffic for single-homed hosts and MAC address synchronization. The peer-address is the IP address (typically on a dedicated SVI over the peer-link) used by the switches to establish the TCP connection for the MLAG control plane.

  2. Question 2Intermediate

    Network Foundations · IPv6 and QoS

    Enterprise QoS Redesign Case Study

    Background:
    You are a network architect for a financial enterprise upgrading its WAN edge routers to Arista devices. The enterprise connects to a Service Provider (SP) via a 10 Gbps physical link, but the contracted Committed Information Rate (CIR) is only 2 Gbps.

    Current Situation:
    The SP strictly drops any traffic exceeding the 2 Gbps rate limit. Users are complaining about poor application performance, significant packet loss during file transfers, and dropped VoIP calls during peak business hours.

    Requirements:

    1. Ensure that traffic leaving the Arista WAN edge router never exceeds the 2 Gbps SP limit.
    2. Prevent excessive packet drops for bursty TCP data traffic (like file transfers).
    3. Prioritize VoIP traffic so it is not delayed by data transfers.

    Based on Arista QoS capabilities, which configuration approach is the optimal solution for this scenario?

    flowchart TD A[Arista WAN Edge] -->|10 Gbps Physical| B(Service Provider) B -->|Strict 2 Gbps Policer| C[Internet/WAN] subgraph QoS Strategy D[Traffic Class] --> E{Rate > 2Gbps?} E -->|Yes| F[Action Required] end
    Show answer & explanation

    Correct answer: B

    Traffic shaping buffers excess traffic rather than dropping it, which smooths out bursts and prevents the SP's strict policer from dropping the packets. This solves the TCP packet loss issue. Combining shaping with a strict priority queue ensures that latency-sensitive VoIP traffic is transmitted first, bypassing the shaped data traffic buffers.

  3. Question 3Advanced

    Data Center Architecture · EVPN Route Types (RT2, RT3, RT5)

    When designing an Arista L3 Leaf-Spine data center fabric with an EVPN-VXLAN overlay, you must choose between Symmetric and Asymmetric Integrated Routing and Bridging (IRB) for inter-subnet routing. Which of the following statements accurately describes a key operational characteristic of Symmetric IRB?

    Show answer & explanation

    Correct answer: B

    In Symmetric IRB, routing occurs at both the ingress VTEP (from source subnet to L3 transit VNI) and the egress VTEP (from L3 transit VNI to destination subnet). This allows VTEPs to only host the VLANs and SVIs for locally connected endpoints, improving scalability. Asymmetric IRB routes only at the ingress VTEP and bridges at the egress VTEP, requiring all VTEPs to have all VLANs.

  4. Question 4Intermediate

    Data Center Architecture · L3LS with BGP Underlay

    You are deploying an Arista L3 Leaf-Spine (L3LS) architecture using eBGP for the underlay routing protocol. Following Arista Validated Design (AVD) best practices for ASN allocation, how should Autonomous System Numbers (ASNs) be assigned across the fabric?

    graph TD S1[Spine 1] --- L1[Leaf 1] S1 --- L2[Leaf 2] S1 --- L3[Leaf 3] S1 --- L4[Leaf 4] S2[Spine 2] --- L1 S2 --- L2 S2 --- L3 S2 --- L4 subgraph MLAG Pair 1 L1 -.- L2 end subgraph MLAG Pair 2 L3 -.- L4 end
    Show answer & explanation

    Correct answer: C

    In Arista best practices for eBGP underlays, all Spine switches share a single contiguous ASN. At the leaf layer, each MLAG pair (e.g., Leaf 1 and Leaf 2) shares a unique ASN. This allows ECMP to function optimally, prevents route loops between the spines, and ensures that MLAG peers can route correctly using iBGP over the peer-link if an uplink fails.

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