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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - Ethernet switching concepts - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 2: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 3: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 4: Routing Protocols | - IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control |
| Topic 5: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Topic 6: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
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NEW QUESTION # 96
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?
Answer: A
Explanation:
Nonstop active routing's defining architectural feature is that the backup Routing Engine runs a fully live, active instance of the routing protocol daemon (rpd) in parallel with the primary Routing Engine's rpd instance, continuously, from the moment NSR and its prerequisite GRES are established - not merely at the instant a switchover begins. As protocol adjacencies form, routes are learned, and the RIB is updated on the primary Routing Engine, that same protocol and RIB state is mirrored in real time to the backup Routing Engine's rpd process through an internal synchronization mechanism, so the backup's protocol state remains a live, up-to-date replica of the primary's at essentially every moment during normal operation. When a switchover occurs, the backup Routing Engine simply assumes the primary role with protocol adjacencies, routing tables, and forwarding state already fully populated and current, allowing it to continue operating without re-establishing neighbor relationships or re-learning the network topology, which is what makes the switchover genuinely nonstop and invisible to neighboring routers. This is fundamentally different from graceful restart, where the restarting router must rebuild its state by requesting help from cooperating neighbors after the fact. The Packet Forwarding Engine plays no role in synchronizing protocol-layer information such as LSAs or BGP updates; that is strictly an rpd-to-rpd function coordinated through the Routing Engine synchronization infrastructure. Reference topics: Junos Enterprise Routing - High Availability, Nonstop Active Routing Architecture and rpd Synchronization.
NEW QUESTION # 97
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
Answer: A,C
Explanation:
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands. set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non- default virtual routing and forwarding (VRF) instance. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing instance by the name mgmt_junos.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic.
NEW QUESTION # 98
Which statement is true about the configuration shown in the exhibit?
Answer: D
NEW QUESTION # 99
Click the Exhibit button. An OSPF broadcast segment has four routers with roles as shown in the exhibit. R1 is currently offline, and default OSPF settings are in place.
In this scenario, what happens when R1 comes back online?
Answer: B
Explanation:
OSPF's Designated Router election, as defined in RFC 2328 and implemented unchanged in Junos, is explicitly non-preemptive. Router priority is used only at the moment an election actually takes place -- that is, when no DR or BDR currently exists on the segment. Once a DR and BDR have been elected and are functioning, a router with a numerically higher priority that joins the segment afterward does not trigger a new election and does not displace the incumbent DR or BDR, no matter how much higher its priority value is. In this scenario, R2 (priority 150) and R3 (priority 100) were already elected DR and BDR respectively while R1 was offline. When R1, whose priority of 200 would have made it the preferred DR had it been present during the original election, returns to the segment, it simply forms a full adjacency with the existing DR and BDR and takes on the DROther role like R4, without any re-election occurring. This design choice exists specifically to prevent unnecessary and disruptive Network LSA regeneration and adjacency churn every time a high-priority router reboots or rejoins a stable broadcast network.
The only ways R1 could become DR going forward are if the current DR fails (promoting the BDR to DR and triggering a new BDR election) or if the entire segment's OSPF process is restarted, forcing a fresh election from a clean state.
NEW QUESTION # 100
Referring to the exhibit, all possible firewall filters are configured along the path from Server A to Server B. In which order will Switch 1 process transmit (Tx) and receive (Rx) firewall filters?
Answer: C
Explanation:
Because Server A resides in VLAN 10 and Server B resides in VLAN 20, traffic between them cannot remain a purely Layer 2 switched flow; it must be routed between the two VLANs, which on Switch 1 means the packet traverses the switch's internal routing engine (via an IRB interface) between the ingress and egress switching stages. Junos processes firewall filters along this path in a strict, layered order that mirrors the packet's actual journey through the device. First, any filter applied at the physical ingress port level (Rx-Port) is evaluated as the frame first arrives on ge-0/0/10. Next, any filter applied to the ingress VLAN (Rx-VLAN, i.e., VLAN 10) is evaluated as the frame is classified into its source broadcast domain. Because the destination subnet requires routing, the packet is then handed to the routing engine, where any input/ingress routed filter (Rx- Router) applied to the receiving IRB interface is evaluated next, followed by any output/egress routed filter (Tx-Router) applied as the now-routed packet is handed from the routing engine back out toward VLAN 20. Finally, the packet passes through any egress VLAN filter (Tx-VLAN, for VLAN 20) and then the egress physical port filter (Tx-Port) on ge-0/0/20 immediately before transmission to Server B. This complete six-stage sequence -- Rx-Port, Rx-VLAN, Rx-Router, Tx- Router, Tx-VLAN, Tx-Port -- reflects every filter-evaluation checkpoint a routed, inter-VLAN packet passes through on an EX Series Layer 3 switch.
NEW QUESTION # 101
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