ACE-L7 sample questions

Question 1

When implementing complex changes on an Arista switch in a production environment, you decide to use the `configure session` command instead of standard configuration mode. Which TWO of the following are primary benefits of using configuration sessions in Arista EOS? (Select TWO)

Accepted Answer

It applies all configuration changes atomically when the commit command is issued.

Accepted Answer

It supports a timer-based commit feature that automatically rolls back changes if not confirmed.

Answer

It allows multiple users to collaborate on the same session concurrently.

Answer

It permanently bypasses SysDB validation to speed up configuration application.

Answer

It automatically synchronizes the configuration to all MLAG peers without additional setup.

Question 2

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?

Accepted Answer

The peer-link carries data plane traffic and MLAG control traffic, while the peer-address is the IP address used to establish the MLAG control plane TCP session.

Answer

The peer-link is an out-of-band management connection, while the peer-address is used for in-band BGP peering.

Answer

The peer-link is only used for Spanning Tree BPDU synchronization, while the peer-address carries all user data traffic.

Answer

The peer-link is a virtual interface created automatically, while the peer-address is the physical MAC address of the neighboring switch.

Question 3

## 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?

```mermaid
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
```

Accepted Answer

Apply egress traffic shaping at 2 Gbps on the Arista router, combined with a strict priority queue for the VoIP traffic class.

Answer

Apply a traffic policer at 2 Gbps on the egress interface of the Arista router to match the SP's configuration.

Answer

Configure TCP Random Early Detection (RED) on the ingress interfaces and police VoIP traffic to 100 Mbps.

Answer

Configure 802.1Qbb Priority-based Flow Control (PFC) on the WAN interface to pause the SP when the 2 Gbps limit is reached.

Question 4

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?

Accepted Answer

Symmetric IRB routes traffic at both the ingress and egress VTEPs using a dedicated Layer 3 transit VNI mapped to the tenant VRF.

Answer

Symmetric IRB requires every VTEP in the fabric to be configured with every VLAN and SVI, regardless of whether local hosts require them.

Answer

Symmetric IRB uses only EVPN Route Type 3 (IMET) to distribute MAC addresses, avoiding the need for Route Type 2.

Answer

Symmetric IRB strictly bridges traffic at the ingress VTEP and routes traffic at the egress VTEP, relying on the destination MAC of the host.

Free ACE-L7 sample questions

When implementing complex changes on an Arista switch in a production environment, you decide to use the `configure session` command instead of standard configuration mode. Which TWO of the following are primary benefits of using configuration sessions in Arista EOS? (Select TWO)

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?

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