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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: OSPF | 15-20% | - Neighbor formation, area design and LSA types - Route summarization and redistribution - Configuration, verification and troubleshooting |
| Topic 2: IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics - Configuration and route exchange |
| Topic 3: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| Topic 4: High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting |
| Topic 5: IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting - IGMP operation and configuration |
| Topic 6: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| Topic 7: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control |
| Topic 8: Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Routing tables, static routes and route preference - Basic routing policy and filter operation |
| Topic 9: BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment - Route advertisement, attributes and path selection |
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NEW QUESTION # 171
Referring to the exhibit, why is the route for 10.5.5.5 hidden?
Answer: A
NEW QUESTION # 172
You are verifying a new BGP peering session with an ISP. You issue the show bgp summary command, but the output shows the peer in the Active state.
Which statement is correct in this scenario?
Answer: B
Explanation:
The BGP finite state machine defined in RFC 4271 progresses through Idle, Connect, Active, OpenSent, OpenConfirm, and finally Established. The Active state is entered either directly after Idle, when the local router begins retrying a TCP connection setup toward the configured peer, or after a previous Connect attempt has failed and the ConnectRetry timer has expired, prompting the router to keep trying to complete the underlying TCP three-way handshake. Seeing a peer parked in Active therefore means the local device has a fully valid neighbor configuration and is persistently attempting to reach the remote address on TCP port 179, but the handshake is not succeeding - common root causes include a firewall or ACL blocking TCP 179 between the two endpoints, an unreachable or incorrect peer IP address, the remote BGP process not running or not listening, or an asymmetric routing path preventing the SYN/ACK from returning. It does not indicate a misconfiguration on the local box in the sense of a missing statement (that would typically leave the session as Idle), nor does it indicate an established, functioning session exchanging UPDATE messages (that state is Established), and it is not a deliberately idle/disabled condition, which Junos reports plainly as Idle.
Recognizing Active as 'trying to connect' rather than 'connected' is essential for correct BGP troubleshooting sequencing. Reference topics: Junos Enterprise Routing - BGP Fundamentals, BGP Finite State Machine and Session Verification.
NEW QUESTION # 173
Which two statements are correct about generated routes? (Choose two.)
Answer: A,D
Explanation:
A is correct because generated routes require a contributing route. A contributing route is a route that matches the destination prefix of the generated route and has a valid next hop. A generated route is only installed in the routing table if there is at least one contributing route available. This ensures that the generated route is reachable and useful. If there is no contributing route, the generated route is not added to the routing table.
B is correct because generated routes show a next hop in the routing table. A generated route inherits the next hop of its primary contributing route, which is the most preferred route among all the contributing routes. The next hop of the generated route can be either an IP address or an interface name, depending on the type of the contributing route. The next hop of the generated route can also be modified by a routing policy.
NEW QUESTION # 174 
Click the Exhibit button.
You have three Juniper Networks EX Series Switches in an STP domain as shown in the exhibit.
Which statement describes the switch that will be elected as the root bridge?
Answer: D
Explanation:
Root bridge election in Spanning Tree Protocol is governed entirely by the Bridge Identifier, an 8-byte value formed by concatenating the configured bridge priority (the higher-order, more significant portion of the comparison) with the switch's MAC address (used strictly as a tiebreaker when priorities are identical). Every participating switch compares Bridge IDs, and the switch advertising the numerically lowest Bridge ID is elected root. In this exhibit, the three switches have distinctly different priority values - EX-1 at the Junos
/IEEE default of 32768, EX-2 at 8192, and EX-3 at 16384 - meaning the comparison is decided entirely at the priority stage and never needs to proceed to a MAC address tiebreak at all. Since 8192 is numerically the lowest of the three priority values, EX-2 is elected root bridge purely on the strength of its lower priority, regardless of what its MAC address happens to be. This is precisely why the correct answer cites priority rather than MAC address as the deciding factor: MAC address only becomes relevant as a tiebreaker in the specific case where two or more switches share an identical priority value, which is not the situation presented here. Understanding that priority is evaluated first and is independently sufficient to decide the outcome whenever it differs is a foundational and heavily tested Spanning Tree concept on the JNCIS-ENT exam.
Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Bridge ID and Root Bridge Election.
NEW QUESTION # 175
Which two statements describe OSPF DR and BDR behavior? (Choose two.)
Answer: B,D
Explanation:
The Backup Designated Router exists specifically to provide immediate failover redundancy for the Designated Router role on a multi-access broadcast or NBMA segment: the BDR maintains full adjacencies with every other router on the segment concurrently with the DR, precisely so that if the DR ever fails or is withdrawn, the BDR can be promoted directly to DR essentially instantaneously, without needing to wait through a fresh, full DR/BDR election process, and a new BDR election then takes place separately among the remaining DROther routers to fill the now-vacant backup role. This immediate promotion behavior confirms the first statement as correct. The Designated Router's other core responsibility on the segment is originating the Type 2 Network LSA, which describes the multi-access network itself as a pseudonode, listing every router attached to that segment; this LSA type exists specifically to avoid the full-mesh explosion of Router LSA adjacency listings that would otherwise be needed to describe a shared broadcast segment, and only the DR - never the BDR, and never any DROther - is responsible for generating and maintaining this particular LSA under normal, stable conditions, which confirms the third statement while directly ruling out the fourth. There is no such thing as the DR 'electing' an area border router; ABR status is instead a role a router acquires organically by having interfaces in more than one OSPF area, entirely independent of any DR
/BDR election process on any individual segment. Reference topics: Junos Enterprise Routing - OSPF, DR
/BDR Roles and Type 2 Network LSA Origination.
NEW QUESTION # 176
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