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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Multiprotocol Label Switching (MPLS) | 12-18% | - Segment routing basics - Configuration and monitoring - LDP and RSVP - Terminology and forwarding - Labels and LIB |
| Topic 2: Protocol-Independent Routing | 10-15% | - Load balancing - Filter-based forwarding - Routing instances and RIB groups - Static, aggregate, and generated routes - Martian addresses |
| Topic 3: Layer 2 Bridging and VLANs | 8-12% | - Service provider switching features - Bridging concepts - VLANs and trunking |
| Topic 4: High Availability | 5-8% | - NSR and GRES concepts - Graceful restart - Nonstop active routing |
| Topic 5: Intermediate System to Intermediate System (IS-IS) | 10-15% | - PDUs and TLVs - Configuration and monitoring - Metrics and wide metrics - Adjacencies and levels |
| Topic 6: IPv6 | 8-12% | - OSPFv3 and BGP for IPv6 - Address types and format - Static and dynamic routing - Autoconfiguration |
| Topic 7: Border Gateway Protocol (BGP) | 20-25% | - Policy and route filtering - IBGP and EBGP - Configuration and troubleshooting - Path selection and attributes - Basic operation and message types |
| Topic 8: Open Shortest Path First (OSPF) | 15-20% | - Areas and router types - Link-state database - Configuration and troubleshooting - LSA types and operation |
| Topic 9: Spanning Tree Protocols | 8-12% | - Configuration and convergence - BPDU and protection features - STP, RSTP, MSTP, VSTP - Port roles and states |
| Topic 10: Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
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NEW QUESTION # 71
What happens if an IS-IS router receives a link-state PDU with a higher sequence number than the one in its database?
Answer: D
Explanation:
IS-IS is a link-state protocol that relies on the rapid and consistent flooding ofLink-State PDUs (LSPs)to ensure that every router in an area has an identical view of the topology. To manage the "freshness" of information, IS-IS uses aSequence Number-a 32-bit unsigned integer that increments every time the originating router makes a change to its LSP.
According to Juniper Networks technical documentation, when a router receives an LSP, it performs a comparison between the received LSP and the version it currently holds in itsLink-State Database (LSDB).
If the received LSP has ahigher sequence number, the router concludes that this is "newer" and more accurate information. The router will then perform two immediate actions:
* Update:It replaces the older LSP in its LSDB with the newly received version.
* Flood:It propagates the new LSP to all other neighbors (except the one that sent it) to ensure the entire area converges on the new data.
If the sequence numbers were equal, the router would ignore the incoming PDU as it already has the information. If the received sequence number werelower, the router would conclude its own database is more recent and would actually send its own "newer" version back to the neighbor to bring them up to date (a process called "poisoning" or refreshing the neighbor).Complete Sequence Number PDUs (CSNPs)(Option C) are used during initial database synchronization or periodic checks on broadcast links, but the primary response to a "newer" LSP is immediate database update and flooding.
NEW QUESTION # 72
Click the Exhibit button. You have a network often routers that have all been configured with an identical SRGB. The exhibit shows the IS-IS configuration from a router called R10. The other nine routers do not yet have an IPv4 shortest-path SR-MPLS LSP to this router.
Which missing part of the configuration must you add on R10 to solve this problem?
Answer: A
Explanation:
For other routers to build an IPv4 shortest-path SR-MPLS LSP to R10, R10 must advertise a reachable SR node segment for its IPv4 loopback/prefix. Configuring an explicit IPv4 node SID ensures R10's loopback prefix is associated with a SID in the SRGB and is advertised in IS-IS, allowing the rest of the network to compute and label-switch traffic to R10 using SR.
NEW QUESTION # 73
Which OSPF packet type is used to initiate and maintain neighbor relationships?
Answer: D
Explanation:
Hello packets are used by OSPF routers to discover neighbors and establish adjacency relationships. They are also sent periodically to maintain the neighbor relationship and verify that neighboring routers are still reachable.
NEW QUESTION # 74
For two or more switches to participate in the same MSTP region, which parameter must match?
Answer: D
Explanation:
Multiple Spanning Tree Protocol (MSTP), as defined in IEEE 802.1s and implemented in Juniper Networks Junos OS, allows for the grouping of VLANs into specific spanning tree instances. This provides significant scalability and load-balancing advantages over traditional STP or RSTP. To achieve this, switches must be grouped into logical "Regions." According to Juniper documentation, for two or more switches to be considered part of the sameMSTP Region, they must possess an identicalMSTP Configuration Identifier. This identifier consists of three specific attributes that must match exactly across all participating switches:
* MSTI Name (Region Name):A descriptive string (up to 32 characters) that identifies the region.
* MSTI Revision Level:A numerical value (0-65535) used to track configuration changes.
* VLAN-to-Instance Mapping:The specific table that defines which VLAN IDs are associated with which Multiple Spanning Tree Instances (MSTIs).
If even one of these parameters-such as theRegion name(Option A)-differs, the switches will treat each other as being in separate regions. When switches are in different regions, they interact using theCommon Spanning Tree (CST), effectively seeing the other region as a single "virtual bridge," which limits the granularity of traffic engineering.
TheExtended system ID(Option B) is a component of the Bridge ID used to carry VLAN information in PVST+ but is not a region-matching requirement.Root bridge priority(Option C) andRoot bridge ID(Option D) are variables used during the STP election process to determine the topology's root, but they do not define the boundaries of an MSTP region itself.
NEW QUESTION # 75
In OSPF, which three fields must match between neighbors before forming an adjacency?
(Choose three.)
Answer: A,C,D
Explanation:
For OSPF neighbors to form an adjacency, certain parameters exchanged in Hello packets must match. The hello interval must be identical on both routers so they send Hello packets at the same rate. The network mask must match on broadcast and nonbroadcast networks to ensure both routers are operating on the same subnet. The dead interval must also match so both routers agree on how long to wait before declaring a neighbor down.
NEW QUESTION # 76
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