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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: OSPF | 15-20% | - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting - Route summarization and redistribution |
| Topic 2: Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| Topic 3: Layer 2 Switching and VLANs | 15-20% | - VLAN concepts, configuration, trunking and tagging - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| Topic 4: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| Topic 5: IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange |
| Topic 6: Layer 2 Security | 10-15% | - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard |
| Topic 7: BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| Topic 8: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms |
| Topic 9: IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
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NEW QUESTION # 19 
Click the Exhibit button.
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: A
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.
Reference topics: Junos Enterprise Switching - Layer 2 Switching and Firewall Filter Processing Order for Routed VLAN Traffic.
NEW QUESTION # 20
Referring to the output shown in the exhibit, which two statements are true?
Answer: B,D
NEW QUESTION # 21
You are asked to deploy nonstop active routing (NSR) on a dual-Routing Engine platform. In this scenario, what are two additional requirements for proper operation? (Choose two.)
Answer: A,B
Explanation:
Nonstop active routing is specifically engineered to be completely transparent to the rest of the network:
rather than relying on neighboring routers to preserve state during a Routing Engine switchover the way graceful restart does, NSR keeps a fully synchronized instance of the routing protocol process (rpd) running continuously on the backup Routing Engine, mirroring protocol adjacencies, the RIB, and session state in real time. Because neighbors never observe a session reset or restart signal during an NSR-driven switchover, there is no dependency on those neighbors supporting or enabling graceful restart extensions at all - this is the core architectural advantage that distinguishes NSR from GR and is precisely why the first and third answer choices are incorrect distractors. What NSR does require locally is Graceful Routing Engine Switchover (GRES) enabled first, since NSR is built as an extension on top of GRES and depends on it to synchronize kernel and interface state between the two Routing Engines before protocol-level synchronization can occur. Additionally, Juniper's official guidance mandates that both Routing Engines run the identical Junos OS software version; mismatched versions between the primary and backup Routing Engine can introduce incompatible internal data structures or feature behavior during state replication, jeopardizing the integrity of a switchover and is explicitly called out as a hard operational requirement rather than a mere best practice. Reference topics: Junos Enterprise Routing - High Availability, Nonstop Active Routing Requirements and GRES Dependency.
NEW QUESTION # 22
Which statement describes how Rapid Spanning Tree Protocol (RSTP) identifies an alternate port?
Answer: D
Explanation:
RSTP, as defined in IEEE 802.1w, introduces explicit, well-defined port roles that go beyond legacy 802.1D STP's simpler root/designated/blocking model, and the alternate port role is one of RSTP's key refinements.
An alternate port is a port that receives BPDUs from a bridge other than the one through which the local switch's actual root port reaches the root bridge - in other words, it represents a second, redundant path toward the root bridge learned from a different upstream bridge than the one currently providing the best (root port) path. Because the existing root port already provides the lowest-cost, actively used path to the root, the alternate port is deliberately held in the discarding (non-forwarding) state during normal, stable operation, functioning purely as a pre-computed, ready-to-use backup; critically, RSTP's major performance advantage over legacy STP is that if the current root port fails, the switch can transition its alternate port directly and almost instantly into the forwarding root port role without needing to pass through the lengthy listening and learning timer-based states that classic STP required, since the alternate port's suitability as a backup was already continuously verified through ongoing BPDU reception. It is not simply 'not receiving BPDUs' (an alternate port receives BPDUs continuously, just inferior ones relative to the current root port), it is not itself the least-cost path (that describes the root port), and it does not forward based on designated-port overload, which is not a concept that exists in RSTP's port-role logic at all. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, RSTP Port Roles: Alternate and Backup Ports.
NEW QUESTION # 23
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure. By default, what impact will this failure have on traffic forwarding between the switches?
Answer: A
Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating. When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link-status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors -- full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation -- reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption.
NEW QUESTION # 24
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