ACE-L7 Arista Certified Engineer Level 7 - Expert Practice Questions
Prepare for ACE-L7 with more than an answer.
- Exam fee
- $295 USD
- Passing score
- Pass/Fail (no numeric score disclosed)
- Level
- Expert
- Valid for
- 2 years
Domains covered on the exam 5
- Network Foundations10%
- Data Center Architecture25%
- Campus Networking25%
- WAN Routing and MPLS20%
- Network Automation20%
- 1
In an Arista BGP EVPN deployment, different Route Types (RT) are used to signal various types of information across the control plane. Which TWO of the following statements correctly map an EVPN Route Type to its primary function? (Select TWO)
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Correct answer: A, C
EVPN Route Type 2 (MAC/IP Advertisement Route) is the core mechanism used to advertise MAC addresses and optionally their associated IP addresses. This provides host-level reachability across the overlay fabric.
EVPN Route Type 5 (IP Prefix Route) is used to advertise IP prefixes rather than individual host MAC/IPs. This is crucial for routing to external networks or advertising entire subnets across the fabric.
- 2
True or False: Arista's MLAG ISSU (In-Service Software Upgrade) allows an administrator to upgrade the EOS version on one MLAG peer switch without causing a full Layer 2 topology recalculation or dropping traffic for dual-homed endpoints.
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Correct answer: A
True. MLAG ISSU is a key feature in Arista EOS that allows one switch in an MLAG pair to be upgraded and rebooted while the other switch continues to forward traffic for dual-homed LACP hosts, resulting in zero downtime and avoiding Spanning Tree recalculations.
- 3
As an Arista network architect, you are explaining the fundamental architecture of Arista EOS to a new engineering team. You need to describe how state is propagated between independent software agents running on the switch. Which architectural component is strictly responsible for serving as the central in-memory database that maintains the real-time state of the system and facilitates inter-process communication between these agents?
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Correct answer: C
SysDB (System Database) is the core architectural component of Arista EOS. It acts as an in-memory database that stores the complete state of the switch. All independent software agents communicate exclusively by writing to and reading from SysDB, rather than communicating directly with each other. NetDB is the network-wide state database used by CloudVision, while NetDL is the modern data lake architecture for broader AI/ML integrations.
- 4
When implementing complex changes on an Arista switch in a production environment, you decide to use the
configure sessioncommand instead of standard configuration mode. Which TWO of the following are primary benefits of using configuration sessions in Arista EOS? (Select TWO)Show answer details
Correct answer: B, D
Configuration sessions in EOS allow administrators to stage multiple commands. These commands are validated and applied atomically (all at once) when the 'commit' command is issued. If any command fails validation during commit, the entire batch is rejected, ensuring the switch does not enter an inconsistent state.
Configuration sessions support the 'commit timer' feature. If an administrator issues a commit with a timer and loses connectivity due to the change, the switch will automatically revert the session changes when the timer expires, restoring access.
