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| Section | Weight | Objectives |
|---|---|---|
| IP Multicast | 5-10% | - Multicast routing monitoring and troubleshooting - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms |
| OSPF | 15-20% | - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types - Route summarization and redistribution |
| IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Configuration and route exchange - Adjacency establishment, levels and metrics |
| High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms |
| BGP | 15-20% | - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection |
| Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features |
| Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging |
| Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria |
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
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NEW QUESTION # 151
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: D
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 # 152
You are asked to explore deploying IS-IS in your network. What are two considerations in this scenario? (Choose two.)
Answer: B,D
NEW QUESTION # 153
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 # 154
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
Answer: A,D
Explanation:
Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity.
In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/redundant-trunk-groups.html
NEW QUESTION # 155
Which two statements describe the purpose of a BGP notification message? (Choose two.)
Answer: C,D
Explanation:
A BGP NOTIFICATION message is one of the four core message types defined in RFC 4271, alongside OPEN, UPDATE, and KEEPALIVE, and it serves a very specific and narrow purpose within the protocol: whenever a BGP speaker detects an unrecoverable, fatal condition in the session -- such as a malformed OPEN message, an unsupported capability, a hold-timer expiration, a finite-state-machine error, or an administratively initiated reset -- it transmits a NOTIFICATION message to its peer immediately before closing the underlying TCP connection and tearing down the session entirely. This confirms that a NOTIFICATION always signals the termination of the session upon a fatal error, never a routine, in-session update. Structurally, every NOTIFICATION message carries a defined error code and error subcode field, which together precisely classify the category and specific nature of the fault that triggered the termination (for example, 'Cease' with a subcode indicating administrative shutdown, or 'Update Message Error' with a subcode indicating a malformed attribute), giving the receiving peer's administrator concrete diagnostic information about exactly why the session was torn down.
Updating route attributes while keeping a session alive is the role of the UPDATE message, not NOTIFICATION, and refreshing a neighbor's table without resetting the session describes the optional Route Refresh capability (a separate, distinct BGP mechanism), neither of which describes NOTIFICATION's function.
NEW QUESTION # 156
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