How does Junos determine which next hops are eligible for ECMP?

Next hops with the same IP address but different interfaces

Next hops that are learned from the same routing protocol

Next hops that have the same route preference and metric

Next hops that are directly connected to the router

A network engineer is troubleshooting uneven traffic distribution across two equal-cost links on a Junos router. The traffic consists of many short-lived UDP flows from many different source IPs to a single destination IP and port. The engineer suspects the hash key is not providing enough entropy. Which change to the hash key configuration would most likely improve distribution?

Disable the hash key and use round-robin per-packet.

Include the protocol field only.

Include the destination IP only.

Include the source port in the hash key.

A network engineer is monitoring a Junos router that has per-flow load balancing enabled across two equal-cost paths. They notice that a single TCP flow is consistently using only one path, while other flows are distributed. What is the expected behavior?

This is a sign of a routing loop, and the router should be rebooted.

This is a misconfiguration, and the router should be set to per-packet load balancing to use both paths for the flow.

This indicates a hash collision, and the router should be reconfigured to use per-packet load balancing.

This is normal because per-flow load balancing ensures that all packets of a flow use the same path to maintain packet ordering.

What is the primary characteristic of per-flow load balancing?

It ensures that all packets of a given flow use the same path

It sends each packet over a different path to maximize utilization

It randomly selects a path for each packet

It uses the source MAC address to determine the path

A network administrator is configuring load balancing on a Junos router that runs BGP. The router receives two equal-cost BGP routes to the same destination prefix from two different peers. The administrator wants to use both paths for traffic forwarding. Which configuration is required?

Enable 'load-balance per-packet' under forwarding-options only.

Configure 'advertise-inactive' under the BGP group.

Set 'multipath' under the BGP group and enable 'load-balance per-flow' under forwarding-options.

Use a routing policy to set 'load-balance per-flow' on the BGP export.

Juniper NetworksCertified Associate, Data Center

Domain 3Objective 4

Load Balancing JN0-281 Practice Questions (Page 1)

Part of the Protocol-Independent Routing domain, which makes up ~16% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–10 in this domain), expect 1–2 from this objective — we provide 16 practice questions to prepare you well beyond it. (estimate)

16questions here

4free pages

6concepts

Questions 1–5

1foundation · easy
How does Junos determine which next hops are eligible for ECMP?
Select an answer first
2application · medium
A network engineer is troubleshooting uneven traffic distribution across two equal-cost links on a Junos router. The traffic consists of many short-lived UDP flows from many different source IPs to a single destination IP and port. The engineer suspects the hash key is not providing enough entropy. Which change to the hash key configuration would most likely improve distribution?
Select an answer first
3expert · easy
A network engineer is monitoring a Junos router that has per-flow load balancing enabled across two equal-cost paths. They notice that a single TCP flow is consistently using only one path, while other flows are distributed. What is the expected behavior?
Select an answer first
4foundation · easy
What is the primary characteristic of per-flow load balancing?
Select an answer first
5application · medium
A network administrator is configuring load balancing on a Junos router that runs BGP. The router receives two equal-cost BGP routes to the same destination prefix from two different peers. The administrator wants to use both paths for traffic forwarding. Which configuration is required?
Select an answer first

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