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Juniper JN0-336 - Security, Specialist (JNCIS-SEC)

Last Update Jul 07, 2026

Juniper Certification Exams Pack

Everything from Basic, plus:
  • Exam Name: Security, Specialist (JNCIS-SEC)
  • 66 Questions Answers with Explanation Detail
  • Total Questions: 66 Q&A's
  • Single Choice Questions: 23 Q&A's
  • Multiple Choice Questions: 43 Q&A's


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Total Questions: 66
Free Practice Questions: 19

How does the SSL proxy service identify SSL traffic?

Options:

A.

by examining the URL

B.

by using AppID results

C.

by examining the destination port

D.

by reading the server certificate

Answer
B
Explanation

The correct answer is B. by using AppID results. Junos SSL proxy does not identify SSL/TLS sessions by assuming that encrypted traffic always uses TCP/443. That would be technically weak because SSL/TLS can run on nonstandard ports, and non-SSL applications can also use common HTTPS ports. Juniper’s SSL proxy documentation explains that SSL proxy works with application security services and that AppID is used in the encrypted-traffic inspection workflow. In earlier wording from Juniper AppSecure material, SSL proxy uses application identification services to determine whether a session is SSL encrypted; in current Junos documentation, SSL proxy and AppID are tightly linked so encrypted sessions can be identified, decrypted, inspected, and then re-encrypted for enforcement.

Option A is wrong because the URL is inside the HTTP payload, and in HTTPS much of the meaningful HTTP content is encrypted before SSL proxy inspection occurs. Option C is wrong because destination port is only a rough hint, not a reliable detection method. Option D is wrong because certificates are used in the SSL/TLS handshake and proxy trust model, but the service’s traffic classification relies on AppID results, not merely reading the server certificate. Reference topics: SSL Proxy, AppID, encrypted session detection, SSL/TLS inspection, application security services.

Which two statements are correct about the security associations of an IPsec VPN? (Choose two.)

Options:

A.

IPsec security associations are established during IKEv1 Phase 2 negotiations.

B.

IKEv1 security associations are established during IKEv1 Phase 2 negotiations.

C.

IPsec security associations are established during IKEv1 Phase 1 negotiations.

D.

IKEv1 security associations are established during IKEv1 Phase 1 negotiations.

Answer
A, D
Explanation

The correct answers are A and D. In IKEv1-based IPsec VPNs, there are two distinct negotiation phases. IKEv1 Phase 1 establishes the secure and authenticated IKE channel between peers. That means the IKE SA is built during Phase 1. Juniper describes Phase 1 as the negotiation of proposals for how to authenticate and secure the channel, including encryption algorithms, authentication algorithms, Diffie-Hellman group, and authentication method.

IKEv1 Phase 2 then uses that secure channel to negotiate the IPsec SAs that protect actual user traffic through the VPN. Juniper states that Phase 2 negotiates security associations to secure the data traversing the IPsec tunnel, and that the Phase 2 proposal includes the security protocol, such as ESP or AH, plus the selected encryption and authentication algorithms. Option B is wrong because IKEv1 SAs are not established in Phase 2; Phase 2 creates IPsec SAs. Option C is wrong because Phase 1 does not create the data-plane IPsec SA; it creates the secure IKE control channel used for Phase 2 negotiation. Reference topics: IPsec VPN, IKEv1 Phase 1, IKE SA, IKEv1 Phase 2, IPsec SA, ESP/AH proposals.

Which two statements accurately describe the role of hashing in VPNs? (Choose two.)

Options:

A.

Hashing compresses data in VPN communications.

B.

Hashing generates a fixed-size string of characters.

C.

Hashing encrypts data to ensure confidentiality.

D.

Hashing verifies that data has not been altered during transmission.

Answer
B, D
Explanation

The correct answers are B and D. In VPN cryptography, hashing is used for authentication and integrity checking, not confidentiality. Juniper’s IPsec documentation describes MD5 as producing a 128-bit hash, also called a digital signature or message digest, from a message of arbitrary length. It also describes SHA as producing a 160-bit hash from a message of arbitrary length. That directly supports option B because a hash function takes variable-length input and produces a fixed-size digest.

Option D is also correct because Juniper states that the resulting hash is used like a fingerprint of the input to verify content and source authenticity and integrity. Juniper’s IPsec overview further explains that Junos compares the calculated message digest against the expected digest to verify that the message has not been tampered with.

Option A is wrong because hashing is not compression; it is one-way digest generation. Option C is wrong because encryption protects confidentiality, while hashing validates integrity and authenticity. In IPsec, algorithms such as AES, DES, and 3DES provide encryption, while MD5, SHA-1, and SHA-2 provide hashing/HMAC-based authentication. Reference topics: IPsec VPN, hashing, HMAC, MD5, SHA, message digest, data integrity.

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Juniper JN0-336 FAQ'S

Find answers to the most common questions about the Juniper JN0-336 exam, including what it is, how to prepare, and how it can boost your career.

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