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NEW QUESTION # 37
Which statement is correct about the candidate configuration in the Junos OS?
Answer: C
Explanation:
The candidate configuration in Junos OS holds configuration changes made in configuration mode that have not yet been committed to the active configuration.
NEW QUESTION # 38
Which two statements about prefix lists in Junos are correct? (Choose two.)
Answer: B,D
Explanation:
Prefix lists in Junos OS are named collections of IP addresses or network prefixes defined under the [edit policy-options] hierarchy. One of their most powerful features is their versatility and reusability. Because they are defined as independent objects, a single prefix list can be referenced in multiple different routing policies across the device. This modularity ensures consistency; for instance, if a set of " internal " prefixes changes, an administrator only needs to update the list in one location for those changes to propagate to every policy that utilizes it.
Furthermore, prefix lists are designed to be used across different functional areas of the Junos architecture.
They are equally valid for use in routing policies (to control the import or export of routes between protocols like BGP or OSPF) and in firewall filters (to match source or destination addresses for transit or management traffic). When used in a routing policy, the prefix list typically performs an exact match on the prefix length unless modified by a match type like orlonger. In a firewall filter, it acts as a high-speed lookup table for the Packet Forwarding Engine. This dual-purpose capability makes prefix lists a foundational tool for architects seeking to implement scalable, automated security and routing logic within a unified configuration framework.
NEW QUESTION # 39
Which two statements are true about the Junos OS? (Choose two.)
Answer: A,C
Explanation:
In Junos OS, as with many network operating systems, the control plane is responsible for processes that determine how to route traffic. This includes maintaining routing tables, which store information about network paths and protocols. Therefore, routing tables are indeed stored in the control plane. Exception traffic refers to packets that cannot be processed by the normal fast-path processing of the Packet Forwarding Engine (PFE) in the forwarding plane, and thus are sent to the control plane for further processing. This might include packets destined for the router itself, packets that need to be fragmented, or packets that match certain firewall filter criteria, among other reasons. Routing tables are not stored in the forwarding plane. However, the forwarding plane contains the forwarding table (sometimes referred to as the forwarding information base or FIB), which is a distilled version of the routing table optimized for fast packet forwarding. The forwarding plane uses this information to perform the actual transfer of packets across the network device interfaces.
NEW QUESTION # 40
Which two statements are correct regarding Layer 2 network switches? (Choose two.)
Answer: B,C
Explanation:
In the Junos OS architecture and general networking standards, Layer 2 switches are designed to increase network efficiency by segmenting collision domains. Unlike legacy hubs, a switch creates a separate collision domain for each of its physical ports. This micro-segmentation allows for full-duplex communication, effectively eliminating the possibility of collisions on individual links. However, while switches segment collision domains, they maintain a single broadcast domain by default.
When a switch receives a broadcast frame, such as an ARP request, it must ensure the frame reaches all possible destinations within the local segment. Consequently, the switch floods the broadcast traffic out of all ports except the one on which it was received. This flooding behavior, while necessary for protocol discovery, makes Layer 2 networks susceptible to traffic loops. If redundant physical paths exist between switches without a loop-prevention mechanism like the Spanning Tree Protocol (STP), broadcast frames can circulate endlessly, leading to a broadcast storm that consumes all available bandwidth and processor resources on the Routing Engine. Furthermore, switches are highly active learners; they populate their Media Access Control (MAC) tables by observing the source addresses of incoming frames to ensure that subsequent unicast traffic is precisely forwarded rather than flooded. Therefore, understanding the management of broadcast domains and the risks of loops is a core competency for any Junos Associate.
Reference: Networking Fundamentals, Collision and Broadcast Domains, Layer 2 Switching Operations.
NEW QUESTION # 41
Exhibit:
You have configured multiple authentication methods on your Junos device, including RADIUS, TACACS+, and local user accounts. A user attempts to log in, but the RADIUS server is unavailable. Referring to the exhibit, which statement is correct?
Answer: D
Explanation:
In the Junos OS architecture, the authentication-order statement within the [edit system] hierarchy defines the sequence in which the device attempts to validate user credentials against external and internal databases. The order specified in the exhibit is [ radius tacplus password ] , meaning the device first queries the RADIUS server, followed by the TACACS+ server, and finally the local password database.
A critical distinction in Junos authentication logic is the difference between a server being " unavailable " and a server " rejecting " a user. If an authentication server responds with an explicit access-reject (meaning it received the request but the credentials were invalid), the authentication process terminates immediately to maintain security integrity. However, if the server is unreachable or fails to respond within the configured timeout period (unavailable), the Junos Control Plane automatically falls back to the next method in the defined sequence. In this specific scenario, since the RADIUS server is unavailable, the device will proceed to attempt authentication using the TACACS+ server. If that were also unavailable, it would finally check the local password database. This fallback mechanism ensures that administrators can still access the device even during external server outages, provided they have a local account configured as the final method in the list.
Reference: User Interfaces, System Authentication, Authentication Order and Fallback.
NEW QUESTION # 42
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