The Juniper ATP C&C (Command and Control) cloud feed provides a dynamic list of known active C&C servers. These servers are fundamental to botnet operations, acting as the central point for controlling infected machines. They are also frequently used as distribution points for malware downloads. SRX Series Firewalls leverage this specific feed to identify and block traffic to and from these malicious servers, thereby disrupting botnet communications and preventing malware infections from these known sources.

A. infected host cloud feed: This feed identifies already compromised hosts within the protected network, not the external servers that are the source of the threats.

B. Geo IP feed: This feed is used for creating policies based on the geographical location of an IP address, not for identifying specific threat types like botnet servers.

D. blocklist feed: This is a generic term. The C&C feed is a specific type of blocklist provided by Juniper ATP, making "C&C cloud feed" the more precise and accurate answer.

1. Juniper Networks TechLibrary

"Understanding Juniper ATP Cloud Feeds": This official documentation explicitly defines the C&C feed: "The Command and Control (C&C) feed is a list of known active C&C servers. SRX Series devices can use this feed to take action against traffic to and from these malicious servers." It also defines the Infected Host feed as a list of clients on your network that are infected.

URL: https://www.juniper.net/documentation/us/en/software/junos/security-policies/topics/concept/juniper-atp-cloud-feeds-understanding.html

2. Juniper Networks TechLibrary

"Security Intelligence Overview": This document describes how SRX Series devices use various threat intelligence feeds. It details the C&C feed's role in blocking communication with botnet command and control servers.

URL: https://www.juniper.net/documentation/us/en/software/junos/security-intelligence/topics/concept/security-intelligence-overview.html

Static NAT establishes a permanent, one-to-one mapping between a specific private IP address and a specific public IP address. This configuration is required when an internal device, such as a server, must be accessible from the public network using a consistent, dedicated public IP address. The mapping is bidirectional, allowing connections to be initiated from either the internal or external network. This directly addresses the scenario's need for one-to-one mappings for a set of servers.

A. source NAT with PAT: This is a many-to-one mapping, translating multiple private IPs to a single public IP using different ports. It is unsuitable for providing dedicated public IPs to servers.

B. destination NAT: While static NAT uses a destination NAT component for inbound traffic, "static NAT" is the more precise term describing the complete, persistent, one-to-one mapping required by the scenario.

C. NAT-T: NAT Traversal (NAT-T) is a method used to allow IPsec VPN traffic to pass through a NAT device; it is not a type of address mapping configuration.

1. Juniper Networks TechLibrary

"Static NAT Overview": "Static NAT provides a one-to-one mapping of a local address to a global address. Because the mapping is static

static NAT allows external devices to initiate connections to internal hosts..." Juniper Networks

"Static NAT Overview

" Junos OS Documentation

2. Juniper Networks TechLibrary

"Source NAT Overview": "Source NAT translates the source IP address of packets that leave a private network... Source NAT is most often used to translate private source IP addresses to public IP addresses." (This describes outbound

typically many-to-one translation). Juniper Networks

"Source NAT Overview

" Junos OS Documentation

3. Juniper Networks TechLibrary

"Understanding NAT Traversal for IPsec": "NAT-T is a method for getting around the IP address translation problems encountered when IPsec traffic passes through a NAT device..." Juniper Networks

"Understanding NAT Traversal for IPsec

" Junos OS Documentation

The question's notation (address/mask) for a wildcard match is unconventional for Junos. The only logical interpretation that yields two correct answers, as requested, is to treat the octets in the mask set to 255 as fixed and the octet set to 0 as a wildcard.

Given the base address 192.168.0.12 and the mask 255.255.0.255, the matching pattern requires the first octet to be 192, the second to be 168, and the fourth to be 12. The third octet can be any value. The resulting pattern is 192.168.X.12. Both 192.168.1.12 and 192.168.22.12 fit this pattern.

A. 192.168.1.21: The fourth octet (21) does not match the required value of 12 from the base address.

B. 192.168.0.1: The fourth octet (1) does not match the required value of 12 from the base address.

1. Juniper Networks TechLibrary - Junos OS Security Configuration Guide

"Understanding Wildcard Addresses": This official documentation clarifies the standard behavior of wildcard addresses in Junos OS. It states

"In a wildcard address

address bits are set to 0 to indicate a match and to 1 to indicate a 'don't care' bit." This shows that the question uses a non-standard

inverted logic for its mask. To achieve the result intended by the question (192.168.X.12)

the correct Junos wildcard mask would be 0.0.255.0.

URL: https://www.juniper.net/documentation/us/en/software/junos/security-policies/topics/concept/security-wildcard-address-understanding.html

By default, all SRX Series devices are equipped with two built-in concurrent user licenses for the Juniper Secure Connect VPN application. This allows for a baseline level of remote access functionality out of the box. To support more than two simultaneous remote access VPN users, an administrator must purchase and install additional subscription-based licenses. These licenses are available in various tiers and are managed through the Juniper Agile Licensing (JAL) portal.

A. 3: This is incorrect. The default license count is explicitly stated as two, not three.

B. 4: This is incorrect. While licenses can be purchased to exceed this number, the default is not four.

D. 5: This is incorrect. The default number of included licenses is two, not five.

1. Juniper Networks TechLibrary

"Licenses for Juniper Secure Connect": "By default

SRX Series devices are enabled with two concurrent user licenses for Juniper Secure Connect. You must purchase license to use more than two concurrent users."

URL: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/concept/juniper-secure-connect-licenses.html

2. Juniper Networks TechLibrary

"Juniper Secure Connect Overview": This document also confirms the default licensing. "By default

SRX Series devices are enabled with two concurrent user licenses for Juniper Secure Connect."

URL: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/concept/juniper-secure-connect-overview.html

On a Juniper SRX Series device, the security policy lookup process follows a strict hierarchical order. For any given traffic session, the device first evaluates the zone-based policies that are specific to the source and destination zone pair. If a matching policy is found within the zone context, it is applied, and the evaluation process stops. Only if no matching zone-based policy is found does the device proceed to evaluate the global policies. This ensures that specific rules for traffic between zones take precedence over more general, global rules.

B. The most restrictive policy is applied regardless of the policy level. This is incorrect. The SRX device applies the first matching policy it encounters in its lookup sequence, not the most restrictive one.

C. A global policy is always evaluated first. This is incorrect. Global policies are evaluated only after the device has checked for and failed to find a matching zone-based policy.

D. The first policy rule is applied regardless of the policy level. This statement is imprecise. The evaluation is structured by policy level (zone-based, then global), not just the order of rules in the configuration.

Juniper Networks TechLibrary

Security Policies Overview: "For a given session

the SRX Series device checks for a matching security policy in the following order: 1. Zone-based policies: Policies that are specific to a pair of zones. 2. Global policies: Policies that apply to all zones." Juniper Networks TechLibrary - Security Policies Overview

Juniper Networks TechLibrary

Understanding Unified Security Policies: This document details the integration of various security features into a single policy structure

which adheres to the fundamental zone-then-global lookup order. Juniper Networks TechLibrary - Understanding Unified Security Policies

Interface-based source NAT is the most appropriate and efficient solution for a Juniper SRX Series device when only a single public IP address is available from the ISP. This configuration method instructs the SRX to use the IP address of its egress (external-facing) interface as the source address for all translated traffic originating from the internal network. This method implicitly uses Port Address Translation (PAT) to allow multiple internal hosts to share the single public IP address simultaneously by mapping each session to a unique port number. It is the standard and simplest configuration for this common scenario.

A. pool-based NAT with PAT: While a pool could be configured with a single IP, "interface-based" NAT is the more direct and specific Juniper feature designed for using the egress interface's IP address.

B. pool-based NAT with address shifting: This is a form of static NAT that requires a one-to-one mapping between private and public IP addresses, making it unsuitable for sharing a single IP among many hosts.

D. pool-based NAT without PAT: Without PAT, a single public IP could only be used by one internal host at a time, as there would be no mechanism to differentiate between concurrent sessions.

1. Juniper Networks TechLibrary

"Understanding Source NAT." This document explicitly describes the two types of source NAT: interface source NAT and source NAT with an address pool. It states

"With interface source NAT

the IP address of the egress interface is used as the source address for the translated traffic." This directly matches the scenario in the question.

URL: https://www.juniper.net/documentation/us/en/software/junos/nat/topics/concept/nat-source-understanding.html

2. Juniper Networks TechLibrary

"Example: Configuring Source NAT (Interface)." This configuration example demonstrates the exact use case. The overview states

"In this example

you configure source NAT to use the IP address of the egress interface as the translation address."

URL: https://www.juniper.net/documentation/us/en/software/junos/nat/topics/example/nat-source-interface-configuring.html

3. Juniper Networks TechLibrary

"Source NAT Rule Configuration Overview." This guide details the source-nat stanza

showing the distinct interface and pool options

reinforcing that "interface" is the specific choice when using the egress interface's IP.

URL: https://www.juniper.net/documentation/us/en/software/junos/nat/topics/topic-map/security-source-nat-rules.html (See the section on Rule Action).

Global NAT address persistence is a feature configured on a source NAT pool. When enabled, it ensures that the Junos device assigns the same translated IP address from the pool for all sessions originating from a specific internal host's IP address. This creates a consistent, or "sticky," mapping between an internal IP and its translated external IP, which is maintained for as long as at least one active session for that host exists.

B: This statement describes the default behavior when address persistence is not enabled. Without persistence, a different IP from the pool can be used for different sessions.

C: The "address-persistence" feature, as defined and configured in Junos OS, applies specifically to source NAT pools, not destination NAT pools.

D: This option is incorrect because it refers to a destination NAT pool and describes non-persistent behavior, which is contrary to the purpose of the feature.

1. Juniper Networks TechLibrary

"Understanding NAT Address Persistence": "Address persistence enables the device to use the same mapped IP address for all sessions from a particular internal IP address... With address persistence enabled for a source NAT pool

for a given original source IP address

the same translated source IP address is allocated for all sessions."

URL: https://www.juniper.net/documentation/us/en/software/junos/nat/topics/concept/nat-address-persistence-understanding.html

2. Juniper Networks TechLibrary

"address-persistence (Security Source NAT)": This configuration guide shows that address-persistence is a statement configured under the [edit security nat source pool pool-name] hierarchy.

URL: https://www.juniper.net/documentation/us/en/software/junos/nat/topics/ref/statement/security-edit-address-persistence.html

The Internet Key Exchange (IKE) protocol establishes a security association (SA) in two distinct phases. The IKE SA, also known as the Phase 1 SA, is created during the first phase of negotiations. Its purpose is to provide a secure, authenticated channel for the subsequent Phase 2 negotiations. A key characteristic of this IKE SA is that it is bidirectional, meaning a single SA handles control traffic in both directions between the two IPsec peers. This is in contrast to IPsec SAs (Phase 2), which are unidirectional.

B: IKE security associations are bidirectional. It is the IPsec SAs, established in Phase 2 to protect data traffic, that are unidirectional.

C: This describes the creation of IPsec SAs. The IKE SA must be established first, during Phase 1, to protect these Phase 2 negotiations.

1. Juniper Networks TechLibrary

"Understanding IKE and IPsec SAs": "The IKE SA is a bidirectional SA that is used for the IKE protocol... In IKEv1

IKE SAs are established in Phase 1." This document explicitly states that IKE SAs are established in Phase 1 and are bidirectional.

URL: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/concept/ipsec-understanding-ike-ipsec-sas.html

2. Juniper Networks TechLibrary

"IPsec Overview": "IKE creates a secure channel for the peers to communicate by negotiating SAs in two phases... Phase 1—The peers establish a secure channel. They authenticate each other and negotiate the way to encrypt further communication... The outcome of a successful Phase 1 exchange is an IKE SA." This confirms the IKE SA is the outcome of Phase 1.

URL: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/concept/ipsec-overview.html

Dead Peer Detection (DPD) is a method used by IKE peers to determine if a peer is unresponsive. The interval parameter specifies the time in seconds between sending DPD probes to the peer. According to the official Juniper Networks documentation for the dead-peer-detection configuration statement, the default interval for sending these probes is 10 seconds. This value ensures a balance between timely detection of a dead peer and minimizing unnecessary network traffic.

A. 20 seconds: This is a valid configurable value within the allowed range (2-60 seconds), but it is not the default setting.

B. 5 seconds: This is the default value for the DPD threshold (the number of unanswered probes before a peer is declared dead), not the interval.

D. 40 seconds: This is a valid configurable value within the allowed range, but it is not the default setting.

1. Juniper Networks TechLibrary

dead-peer-detection (Security IKE): This official documentation page explicitly states the default value for the DPD interval.

URL: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/ref/statement/security-edit-dead-peer-detection.html

Quote: Under the interval option description

it states: "Interval at which DPD requests are sent to the peer. Range: 2 through 60 seconds. Default: 10 seconds."

By default, Juniper SRX Series devices operate in flow mode. This is the standard mode for a stateful firewall, where the device inspects traffic based on connection states or "flows." The first packet of a new session is checked against the security policy, and if permitted, a session is created in the session table. Subsequent packets belonging to that session are processed quickly based on the existing state.

Additionally, SRX Series devices, running the Junos OS, fully support stateless firewall filters. These filters evaluate each packet individually against a set of rules without considering connection state. They are commonly used to protect the Routing Engine (RE) or to filter traffic at the interface level before it undergoes flow-based processing.

C: Packet mode is a non-default operational mode that disables stateful firewalling, causing the SRX to function more like a traditional stateless router.

D: SRX devices inherently support stateless firewall filters as a fundamental feature of the Junos operating system.

1. Juniper Networks TechLibrary

"Flow-Based and Packet-Based Processing." This document explicitly states

"By default

SRX Series devices operate in flow mode." It details how flow mode enables stateful security features

which is the primary function of an SRX device.

URL: https://www.juniper.net/documentation/us/en/software/junos/flow-packet-processing/topics/concept/flow-based-packet-based-processing-understanding.html

2. Juniper Networks TechLibrary

"Firewall Filters Overview." This guide describes the functionality of stateless firewall filters on Junos devices

including the SRX Series. It confirms that these filters are available to "filter data packets that are transiting the device" and to "protect the Routing Engine from malicious traffic."

URL: https://www.juniper.net/documentation/us/en/software/junos/firewall-filters/topics/concept/firewall-filter-overview.html