In an EVPN-VXLAN fabric, what is the role of the underlay network?

It terminates VXLAN tunnels and performs MAC learning.

It provides the routing protocol for the overlay, such as MP-BGP EVPN.

It carries the VXLAN encapsulated overlay traffic between leaf switches.

It is used only for management traffic and does not carry data traffic.

When configuring ECMP load balancing on a Juniper switch, which statement is true?

ECMP load balancing is automatically enabled when multiple equal-cost routes are present.

ECMP requires the use of BGP as the underlay routing protocol.

The load-balancing algorithm can be configured to use per-flow or per-packet methods.

The default load-balancing algorithm uses the source and destination MAC addresses.

Why are loopback addresses used in an EVPN-VXLAN overlay?

They provide a stable source and destination IP address for VXLAN tunnels, independent of physical interface state.

They are used to route traffic between VLANs on the same leaf switch.

They are required for the underlay routing protocol to form adjacencies.

They allow the switch to respond to ICMP echo requests from any interface.

In an EBGP underlay for a spine-leaf fabric, what is the typical purpose of configuring a private AS number on each leaf and spine switch?

To allow the switches to exchange loopback routes for overlay traffic.

To ensure that the underlay routing table remains small by summarizing routes.

To create a unique autonomous system for each switch, enabling EBGP sessions between all spine-leaf pairs.

To enable BGP route reflection between the spine and leaf switches.

Juniper NetworksCertified Specialist, Data Center (JNCIS-DC)

Domain 1Objective 1

Underlay Network Design JN0-481 Practice Questions (Page 1)

Part of the Data Center Architectures (IP Fabrics, EVPN-VXLAN) domain, which makes up ~5% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~2–3 in this domain), expect 1–1 from this objective — we provide 9 practice questions to prepare you well beyond it. (estimate)

9questions here

2free pages

5concepts

Questions 1–5

1foundation · easy
In an EVPN-VXLAN fabric, what is the role of the underlay network?
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2foundation · easy
When configuring ECMP load balancing on a Juniper switch, which statement is true?
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3foundation · easy
What is the recommended load-balancing mode for most data center underlay deployments?
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4foundation · easy
Why are loopback addresses used in an EVPN-VXLAN overlay?
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5foundation · easy
In an EBGP underlay for a spine-leaf fabric, what is the typical purpose of configuring a private AS number on each leaf and spine switch?
Select an answer first

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