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| Section | Weight | Objectives |
|---|---|---|
| Layer 2 Bridging and VLANs | 8-12% | - Bridging concepts - Service provider switching features - VLANs and trunking |
| Multiprotocol Label Switching (MPLS) | 12-18% | - Configuration and monitoring - Segment routing basics - Labels and LIB - LDP and RSVP - Terminology and forwarding |
| Spanning Tree Protocols | 8-12% | - STP, RSTP, MSTP, VSTP - BPDU and protection features - Port roles and states - Configuration and convergence |
| Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Border Gateway Protocol (BGP) | 20-25% | - Path selection and attributes - IBGP and EBGP - Policy and route filtering - Configuration and troubleshooting - Basic operation and message types |
| High Availability | 5-8% | - NSR and GRES concepts - Graceful restart - Nonstop active routing |
| Open Shortest Path First (OSPF) | 15-20% | - LSA types and operation - Areas and router types - Configuration and troubleshooting - Link-state database |
| IPv6 | 8-12% | - OSPFv3 and BGP for IPv6 - Autoconfiguration - Static and dynamic routing - Address types and format |
| Intermediate System to Intermediate System (IS-IS) | 10-15% | - Configuration and monitoring - Adjacencies and levels - Metrics and wide metrics - PDUs and TLVs |
| Protocol-Independent Routing | 10-15% | - Static, aggregate, and generated routes - Filter-based forwarding - Load balancing - Martian addresses - Routing instances and RIB groups |
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NEW QUESTION # 79
An established RSVP-signaled LSP suffers a link failure. What is one action taken by the local RSVP-enabled router?
Answer: D
NEW QUESTION # 80
During OSPF neighbor establishment, which packet type is used to describe the contents of the link-state database?
Answer: B
Explanation:
In theOSPF (Open Shortest Path First)protocol, ensuring that all routers within an area have a synchronized Link-State Database (LSDB)is fundamental to building a consistent loop-free topology. During the adjacency formation process-specifically when transitioning from theExStartstate to theExchangestate- routers must determine what information they are missing from their neighbors without sending the entire database at once, which would be highly inefficient.
TheDatabase Description (DBD)packet, also known as a DDP, is the mechanism used for this summary exchange. According to Juniper Networks technical documentation, the DBD packet does not contain full Link-State Advertisements (LSAs). Instead, it contains only theLSA headers, which include the LSA type, the ID of the advertising router, and the sequence number.
By exchanging these headers, a Juniper router can compare the neighbor's database summary against its own local LSDB. If the router identifies a header in the DBD packet that represents a newer or missing entry, it records that LSA in its "Link-State Request List." This collaborative "handshake" ensures that only the necessary, updated information is requested in the subsequentLink-State Request (LSR)phase. It is important to distinguish this from theLink-State PDU (LSP)mentioned in Option D, which is actually the term used in the IS-IS protocol, not OSPF. In OSPF, the functional unit is the LSA, and the transport vehicle for the initial summary is the DBD packet. This methodical synchronization is what allows OSPF to scale effectively in large service provider environments.
NEW QUESTION # 81
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: C,D
Explanation:
All listed ports are in the designated role and forwarding state, and the designated bridge ID shown matches the local bridge ID, which indicates the device is acting as the root bridge for this spanning-tree instance.
The bridge ID begins with 32768, which corresponds to the default bridge priority of 32,768 (32k).
NEW QUESTION # 82
When would you use the qualified-next-hop statement with a static route?
Answer: A
Explanation:
Qualified next hops allow you to associate one or more properties with a particular next-hop address. You can set an overall preference for a particular static route and then specify a different preference for the qualified next hop. For example, suppose two next-hop addresses (10.10.10.10 and 10.10.10.7) are associated with the static route 192.168.47.5/32. A general preference is assigned to the entire static route, and then a different preference is assigned to only the qualified next-hop address 10.10.10.7. For example:
The qualified-next-hop statement with a static route is used to specify multiple next hops for a static route with different preferences (priorities). This allows for more granular control over the path selection process in the event that the primary next hop becomes unreachable.
NEW QUESTION # 83
What prevents routing loops in a single-area OSPF network?
Answer: B
Explanation:
In OSPF, loop prevention within a single area is achieved through the fundamental nature of its link-state architecture. Unlike distance-vector protocols that rely on "routing by rumor," OSPF ensures that every router within an area maintains an identicalLink-State Database (LSDB). This database acts as a complete map of the network topology.
Once the LSDB is synchronized, each router independently executes theShortest Path First (SPF) algorithm
, which is formally known as theDijkstra algorithm. This mathematical process treats the local router as the
"root" of a tree and calculates the shortest path to every other node (router) and prefix in the area based on the cumulative interface costs. Because every router uses the same synchronized map (the LSDB) and the same deterministic algorithm, they all arrive at a consistent, loop-free view of the best paths.
According to Juniper Networks technical documentation, the Dijkstra algorithm is superior to theBellman- Ford algorithm(used by distance-vector protocols like RIP) in this regard. Bellman-Ford is susceptible to
"count-to-infinity" problems and loops because routers only know the distance and direction to a destination provided by their neighbors, rather than the full topology. In OSPF, even if a link fails, the updated Link-State Advertisement (LSA) is flooded rapidly, and the Dijkstra algorithm is re-run to find a new loop-free path.
Routing policies(Option B) are used to manipulate path selection or filter routes but are not the primary mechanism for fundamental loop prevention in OSPF. Similarly,forwarding policies(Option D) govern how traffic is handled at the data plane level rather than determining the control plane's loop-free topology.
NEW QUESTION # 84
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