Pass the Juniper JNCIS-SEC JN0-336 Questions and answers with ExamsMirror

The correct answers are A and B. The exhibit shows show chassis cluster statistics. Under Control link statistics, Control link 0 has heartbeat packets sent and received, with heartbeat packet errors: 0. That is the clearest indication that the control link is operating normally. Juniper describes chassis-cluster control-plane verification as checking control-link heartbeat packets sent and received, along with heartbeat errors. If both send and receive counters are incrementing and errors are zero, the control link is functioning.

Option A is also correct because under Fabric link statistics, Child link 0 shows probes sent and probes received. Juniper uses fabric-link probe counters to verify fabric-link operation; nonzero sent and received probe counters indicate that the link is participating in fabric monitoring. Option C is not the safest conclusion from this exhibit alone. Child link 1 shows zero probes sent and received, but the output does not prove that a second fabric child link is configured and failing; it could simply be unused or not configured in this deployment. Option D is directly contradicted by the healthy heartbeat counters. Reference topics: HA Clustering, chassis cluster statistics, control-link heartbeat, fabric-link probes, cluster health verification.

The correct answers are A and C. In SSL forward proxy, the SRX sits between internal clients and external SSL/TLS servers. Juniper’s SSL proxy configuration documentation shows that a forward proxy profile is created when root-ca is configured and server-certificate is not configured. This root CA is used by the SRX to generate substitute certificates for intercepted SSL sessions, so internal clients must trust the CA used by the firewall. Juniper’s procedure specifically includes generating or loading a local certificate and applying it as the root-ca in the SSL proxy profile.

Option C is also correct because forward proxy terminates the client-side SSL session and establishes a separate SSL session toward the destination server. Juniper states that the SSL proxy acts as an SSL server to the client and establishes a new SSL session to the server; from the server’s perspective, the SRX is the SSL client. Option B is wrong because forward proxy intercepts the server certificate and creates a substitute certificate; forwarding the actual server certificate unchanged is associated with reverse proxy behavior. Option D is wrong because Encrypted Traffic Insights is not the required forward-proxy mechanism here. Reference topics: SSL Proxy, SSL forward proxy, root CA, client protection, certificate interception.

The correct answers are A and B. In SRX chassis clustering, the fabric link, represented by fab interfaces, is the data-plane connection between the two cluster nodes. Juniper describes the fabric as the back-to-back data connection used when traffic on one node must be processed on the other node or must exit through an interface on the other node; session-state information also passes over the fabric. This is especially visible in active/active clustering, where ingress and egress interfaces can reside on different nodes and transit traffic must cross the fabric link.

Option B is also correct because the fabric link still exists in active/passive clustering for cluster data-plane synchronization and inter-node state handling, even though active/passive designs minimize fabric transit traffic because only one node normally forwards traffic at a time. Juniper specifically states that active/passive mode minimizes traffic over the fabric link, not that the fabric link is unused.

Options C and D are not the intended answers. The cluster is identified by a configured cluster ID, and each chassis is identified by a node ID, but the fabric interface names themselves are not where the cluster ID is reflected. Reference topics: HA Clustering, fabric link, active/active clustering, active/passive clustering, session synchronization, inter-node traffic.

The correct answers are B and C. To form an SRX chassis cluster, both devices must be assigned the same cluster ID and different node IDs. Juniper states that the cluster ID identifies the cluster, while the node ID identifies the individual node within that cluster. A valid two-node SRX chassis cluster uses node 0 on one chassis and node 1 on the other chassis. Juniper’s example shows the operational-mode commands as set chassis cluster cluster-id 1 node 0 reboot on the first device and set chassis cluster cluster-id 1 node 1 reboot on the second device.

Option A is wrong because cluster-id 0 disables clustering rather than forming a cluster. It also shows configuration-mode prompt #, while this chassis cluster node assignment is performed from operational mode. Option D is doubly wrong: cluster-id 0 disables clustering, and node 2 is invalid because SRX chassis cluster node IDs are limited to 0 and 1. The exam options omit the reboot keyword, but the only logically valid pair is still SRX1 as node 0 and SRX2 as node 1 under the same nonzero cluster ID. Reference topics: HA Clustering, chassis cluster ID, node ID, operational-mode cluster enablement.

The correct answer is B. LDAP. In Juniper identity-aware firewall deployments, the SRX Series Firewall integrates with Microsoft Active Directory so that user and group information can be used in security policy decisions. Juniper’s Active Directory identity-source documentation states that the LDAP protocol helps identify the groups to which users belong, and that username and group information are queried from the LDAP service running on the Active Directory domain controller. It also explains that the device uses Lightweight Directory Access Protocol to obtain user and group information required for Active Directory identity-source operation.

Option A, SSH, is wrong because SSH is a device management protocol, not the protocol SRX uses to query Active Directory user/group membership. Option C, DNS, is wrong because DNS can resolve names but does not provide Active Directory group mapping to the firewall. Option D, NETCONF, is wrong because NETCONF is used for network device configuration and automation, not Windows domain-controller identity queries. In a complete identity-aware firewall workflow, SRX may also use WMI/DCOM-related mechanisms to read Windows event-log data, but among the available protocol choices, LDAP is the correct answer because it is the directory protocol used to query user and group information. Reference topics: Active Directory identity source, LDAP, domain controller communication, user and group mapping.

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.

The correct answer is C. device policy rules. In Junos Space Security Director, a firewall rule that must apply uniquely to one SRX Series device belongs in the device-specific policy layer, not in global or group-level policy. Juniper’s Security Director documentation states that a device can have a device-specific policy and can also be part of multiple group policies; the rule processing order places policies applied before device-specific policies first, then device-specific policies, then policies applied after device-specific policies. Juniper also explains that rules applied before device-specific policies take priority and cannot be overridden, while rules applied after device-specific policies can be overridden by adding a rule in the device-specific policy.

Option A is wrong because all-devices prerules are global mandatory rules applied before device-specific policy, not unique device exceptions. Option B is wrong because group policy prerules apply to a group of devices, not one specific SRX. Option D is wrong because all-devices postrules are still global policy rules, although they can be overridden. For a unique policy requirement on one SRX device, device policy rules are the precise Security Director construct. Reference topics: Security Director, firewall policies, device-specific policies, policy rule precedence, global/group/device rule hierarchy.

The correct answers are A and D. For identity-aware security policies, Junos can obtain user identity information from supported identity sources such as Active Directory and Juniper Identity Management Service (JIMS). Active Directory is the direct identity-source option where the SRX integrates with Microsoft Windows Active Directory and uses directory information for user and group mapping. Juniper’s identity-aware firewall documentation states that the firewall obtains user information from identity sources including Active Directory and JIMS, and then uses that identity data in policy decisions.

JIMS is also correct because it centralizes identity collection and provides SRX enforcement points with user, device, IP address, and group-mapping information. Juniper describes JIMS as providing SRX firewalls with high-scale identity data so they can make user-firewall policy decisions. Option B, TACACS+, is wrong because TACACS+ is primarily an administrative authentication, authorization, and accounting protocol, not the LDAP identity-source service used for identity-aware firewall mappings. Option C, RADIUS, is also wrong in this context because RADIUS can authenticate users, but it is not the LDAP directory integration service being tested here. Reference topics: Identity-Aware Firewall, Active Directory identity source, JIMS, LDAP user/group mapping, SRX authentication table.

The correct answers are B and C. Adaptive Threat Profiling allows SRX Series Firewalls to act either as inline enforcement devices or as tap-based sensors. In an inline deployment, the SRX is directly in the traffic path and can enforce policy actions such as blocking, denying, or adding threat indicators to Security Intelligence feeds for real-time mitigation. In a tap deployment, the SRX observes copied traffic from a TAP/SPAN-style feed and contributes intelligence without being the active forwarding device. Juniper’s ATP Cloud documentation states that Adaptive Threat Profiling enables SRX devices to be deployed as sensors on Tap ports, identifying and sharing intelligence to inline devices for real-time enforcement. It also describes a “Tap-based SRX Series Firewall sensor” and contrasts it with an inline device.

Option A, bridge, is not the deployment mode being tested here. Bridge/transparent forwarding is a firewall deployment style, not the named Adaptive Threat Profiling mode. Option D, promiscuous, is also wrong; promiscuous mode is an interface behavior, not the ATP Adaptive Threat Profiling deployment model. Reference topics: ATP Cloud, Adaptive Threat Profiling, tap sensors, inline enforcement, Security Intelligence feeds.

The correct answer is A. fab. In SRX Series chassis clustering, the fabric interface, shown as fab0/fab1, is the data-plane HA link used between cluster nodes. Juniper states that SRX chassis clusters use the fabric interface for session synchronization and traffic forwarding, and that the fabric link synchronizes dynamic runtime state, including session-state objects created by NAT, ALG, authentication, and IPsec processing. This is what enables stateful failover and session continuity when traffic processing moves between nodes.

Option B, fxp0, is wrong because fxp0 is the out-of-band management interface, not the chassis-cluster synchronization path. Option C, fxp1, is tempting but wrong for this question: fxp1 is the control-link interface used for control-plane cluster functions such as heartbeats and cluster control communication, not the main session-state synchronization path. Option D, swfab, is not the standard SRX chassis-cluster fabric interface name used for this function. Juniper’s clustering configuration examples specifically define fab0 and fab1 as the interfaces used for the fabric connection and data-plane RTO/session synchronization.