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| Section | Weight | Objectives |
|---|---|---|
| OSPF | 15-20% | - Route summarization and redistribution - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting |
| Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| 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 |
| IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Configuration and route exchange - Scalable enterprise deployment and troubleshooting |
| High Availability and Resiliency | 5-10% | - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing - Network resiliency design and troubleshooting |
| Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity - Tunnel types, encapsulation and operation |
| IP Multicast | 5-10% | - Multicast routing monitoring and troubleshooting - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms |
| BGP | 15-20% | - Route advertisement, attributes and path selection - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting |
| Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control |
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NEW QUESTION # 75
Which statement describes how a generated route determines its next hop?
Answer: A
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 # 76
Your GRE tunnel is not transitioning to the Upstatus. What would be the first step in troubleshooting the problem?
Answer: B
NEW QUESTION # 77
You need to configure a Juniper Networks EX Series Switch to be able to accept both tagged and untagged traffic on the same access port.
Which feature will allow you to accomplish this task?
Answer: B
Explanation:
Voice VLAN is the Junos feature specifically designed to allow a single access port to simultaneously handle two distinct traffic streams: untagged data traffic from a PC or workstation using the port's normal access VLAN, and separately tagged voice traffic generated by an IP telephone that is typically daisy-chained between the switch port and the connected PC. When voice VLAN is configured on an access interface, the switch instructs the attached IP phone (commonly via LLDP-MED) which VLAN ID to tag its voice traffic with, and the switch is then able to correctly classify and prioritize that tagged voice traffic into its designated voice VLAN while simultaneously continuing to treat any untagged frames arriving on that same physical port as belonging to the port's regular, untagged access VLAN - precisely satisfying the requirement to accept both tagged and untagged traffic together on one access port. Native VLAN, by contrast, is a trunk- port-only concept that designates which VLAN untagged frames on a trunk should be associated with; it has no applicability to an access port and does not enable simultaneous tagged traffic acceptance there. Default VLAN simply refers to the VLAN an interface belongs to absent other configuration and carries no dual- traffic capability. IRB interfaces provide Layer 3 gateway functionality for a VLAN and are unrelated to how tagged versus untagged frames are accepted at Layer 2 on a given physical port. Reference topics: Junos Enterprise Switching - VLANs, Configuring Voice VLAN on Access Interfaces.
NEW QUESTION # 78
Which three statements are correct about OSPF packet types? (Choose three.)
Answer: B,C,E
NEW QUESTION # 79
Which IS-IS PDU should be used by a router to list all LSPs that it believes should exist in the link-state database?
Answer: C
Explanation:
The Complete Sequence Number PDU (CSNP) is the IS-IS mechanism used to summarize the entire contents of a router's link-state database, listing the LSP ID, sequence number, checksum, and remaining lifetime for every LSP the sending router currently believes should exist in the database for that level. On broadcast (LAN) circuits, the elected Designated Intermediate System periodically transmits CSNPs to all routers on the segment as a database-synchronization mechanism; any receiving router compares the summarized list against its own local database, and any discrepancy - an LSP it is missing entirely, or one for which it holds an older sequence number - triggers a targeted request for the specific, updated LSP content. On point-to-point circuits, a single CSNP is exchanged once when the adjacency first comes up, serving the identical synchronization purpose without needing periodic repetition. The Partial Sequence Number PDU (PSNP), by contrast, is used to acknowledge receipt of specific LSPs or to explicitly request specific LSPs identified as missing or outdated after a CSNP comparison, making it a partial, targeted PDU rather than a complete database listing. The LSP itself is the PDU that actually carries the detailed topology and reachability information being advertised, rather than a database summary. The IS-IS Hello PDU (IIH) is used purely for neighbor discovery and adjacency maintenance and carries no link-state database summary information whatsoever. Reference topics: Junos Enterprise Routing - IS-IS, CSNP and Link-State Database Synchronization.
NEW QUESTION # 80
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