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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms |
| Topic 2: IP Multicast | 5-10% | - IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms |
| Topic 3: OSPF | 15-20% | - Configuration, verification and troubleshooting - Route summarization and redistribution - Neighbor formation, area design and LSA types |
| Topic 4: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Topic 5: Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging |
| Topic 6: IS-IS | 10-15% | - Configuration and route exchange - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics |
| Topic 7: Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Routing instances and route selection criteria - Basic routing policy and filter operation |
| Topic 8: Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control - DHCP snooping, Dynamic ARP Inspection and IP Source Guard |
| Topic 9: BGP | 15-20% | - Neighbor relationships and session establishment - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting |
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NEW QUESTION # 38
Which statement describes how a generated route determines its next hop?
Answer: B
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least-specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here.
NEW QUESTION # 39
You are required to ensure that Switch 1 will always be designated as the root bridge when participating in your switched network.
What do you need to do to satisfy this requirement?
Answer: D
Explanation:
Because root bridge election is decided primarily by comparing bridge priority values - with the switch advertising the numerically lowest priority always winning, and MAC address serving only as a fallback tiebreaker when priorities are tied - the only deterministic, reliable way to guarantee that a specific switch is elected root regardless of any other switch's hardware characteristics is to explicitly configure that switch with a lower bridge priority than every other participating switch in the topology. Relying on MAC address alone, as the first distractor suggests, is fundamentally unreliable: MAC addresses are burned in at the factory, cannot be predicted or controlled by the administrator, and any future hardware replacement or newly introduced switch with a numerically lower MAC address could unexpectedly seize the root role since MAC comparison only comes into play at equal priority in the first place, meaning a 'highest MAC' strategy does not even align with how the tiebreak actually favors the lowest value. Port priority and port cost are entirely separate STP parameters that influence which port on a non-root switch is selected as its root port, or which port is selected as designated versus blocking on a given segment; neither parameter has any bearing whatsoever on which switch is elected root bridge for the whole topology, since that decision is made purely from the Bridge ID comparison, independent of any per-port settings. Explicitly and deliberately lowering Switch 1's configured bridge priority is the only correct, industry-standard method. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Guaranteeing Root Bridge Placement via Bridge Priority.
NEW QUESTION # 40
Referring to the exhibit, which statement is correct?
Answer: A
Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.
NEW QUESTION # 41
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: D
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 # 42 
Click the Exhibit button.
Devices on VLAN 5 and VLAN 7 need to communicate with each other.
Referring to the exhibit, what will satisfy this requirement?
Answer: D
Explanation:
VLAN 5 and VLAN 7 are two entirely separate Layer 2 broadcast domains, each with its own distinct IP subnet, and devices in one VLAN can never reach devices in the other through switching alone - Layer 3 routing between the two subnets is mandatory for any inter-VLAN communication to occur, regardless of how the VLANs are configured at Layer 2. On a single EX Series switch, the correct and standard mechanism for enabling this routing without an external router is to create one integrated routing and bridging (IRB) logical interface for each VLAN, assign each IRB the appropriate gateway IP address for its respective subnet (192.168.5.1 for VLAN 5's irb.5 and 192.168.7.1 for VLAN 7's irb.7, for example), and ensure routing is active on the switch so that traffic arriving at one IRB's gateway address destined for the other VLAN's subnet is routed internally between the two IRB interfaces. Attempting to bind a single family inet interface with two distinct subnet addresses via secondary addressing conflates two separate broadcast domains onto one Layer 3 interface incorrectly and is not how VLAN routing is architected in Junos. Spanning tree exists purely to prevent Layer 2 loops and has no routing function whatsoever, so configuring it cannot enable inter-VLAN reachability. Placing both VLANs on a single trunk with Multiple VLAN Registration Protocol (MVRP) only automates VLAN membership propagation across trunk links; it does not provide any Layer 3 routing capability between the VLANs either. Reference topics: Junos Enterprise Switching - Routing VLANs, Configuring IRB Interfaces for Inter-VLAN Routing.
NEW QUESTION # 43
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