A network engineer is troubleshooting a MACsec link between two Juniper devices. The link is up, but the 'show security macsec associations' output shows 'Secure' as 'No'. Both devices have the same pre-shared key configured. What is the most likely cause of this issue?

The interface is administratively down.

MKA is not enabled on one or both interfaces.

MACsec is configured in 'must-secure' mode on one side only.

The pre-shared key is too short.

What is a common method for initially establishing a MACsec secure association when a RADIUS server is not available?

Using a pre-shared key (PSK) configured on both ends of the link

Using a digital certificate from a public CA

Using the device's serial number as the key

Using a static ARP entry to exchange keys

A network engineer is verifying MACsec operation on a Juniper device. The 'show security macsec associations' output shows 'Secure: Yes'. What does this indicate?

The pre-shared key is correctly configured but MKA is not running.

The device is ready to establish MACsec but has not done so yet.

The interface is up but not yet encrypting.

The link is encrypted and protected by MACsec.

A network engineer is setting up MACsec between two Juniper devices. They want to use a pre-shared key but are unsure whether to enable MKA. What is the role of MKA in this setup?

MKA is optional and only needed for troubleshooting.

MKA encrypts the data traffic on the link.

MKA replaces the need for a pre-shared key.

MKA authenticates the peers and derives session keys for encryption.

Which benefit does MACsec provide that IPsec does not?

It authenticates users before granting network access

It provides end-to-end encryption across multiple hops

It secures traffic at the application layer

It protects all traffic on a link, including control and management protocols

Juniper NetworksCertified Professional, Security (JNCIP-SEC)

Domain 3Objective 4

MACsec JN0-637 Practice Questions (Page 4)

Part of the Layer 2 Security domain, which makes up ~14% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~5–8 in this domain), expect 1–2 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

21questions here

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4concepts

Questions 16–20

16application · medium
A network engineer is troubleshooting a MACsec link between two Juniper devices. The link is up, but the 'show security macsec associations' output shows 'Secure' as 'No'. Both devices have the same pre-shared key configured. What is the most likely cause of this issue?
Select an answer first
17foundation · easy
What is a common method for initially establishing a MACsec secure association when a RADIUS server is not available?
Select an answer first
18application · easy
A network engineer is verifying MACsec operation on a Juniper device. The 'show security macsec associations' output shows 'Secure: Yes'. What does this indicate?
Select an answer first
19application · easy
A network engineer is setting up MACsec between two Juniper devices. They want to use a pre-shared key but are unsure whether to enable MKA. What is the role of MKA in this setup?
Select an answer first
20foundation · easy
Which benefit does MACsec provide that IPsec does not?
Select an answer first

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