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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: High Availability | 5-8% | - Nonstop active routing - Graceful restart - NSR and GRES concepts |
| Topic 2: Multiprotocol Label Switching (MPLS) | 12-18% | - Terminology and forwarding - Segment routing basics - Labels and LIB - LDP and RSVP - Configuration and monitoring |
| Topic 3: Border Gateway Protocol (BGP) | 20-25% | - Basic operation and message types - IBGP and EBGP - Path selection and attributes - Policy and route filtering - Configuration and troubleshooting |
| Topic 4: Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Topic 5: Layer 2 Bridging and VLANs | 8-12% | - VLANs and trunking - Service provider switching features - Bridging concepts |
| Topic 6: Spanning Tree Protocols | 8-12% | - BPDU and protection features - STP, RSTP, MSTP, VSTP - Configuration and convergence - Port roles and states |
| Topic 7: Intermediate System to Intermediate System (IS-IS) | 10-15% | - Adjacencies and levels - PDUs and TLVs - Metrics and wide metrics - Configuration and monitoring |
| Topic 8: Protocol-Independent Routing | 10-15% | - Load balancing - Filter-based forwarding - Static, aggregate, and generated routes - Routing instances and RIB groups - Martian addresses |
| Topic 9: IPv6 | 8-12% | - Autoconfiguration - Static and dynamic routing - Address types and format - OSPFv3 and BGP for IPv6 |
| Topic 10: Open Shortest Path First (OSPF) | 15-20% | - Areas and router types - Link-state database - LSA types and operation - Configuration and troubleshooting |
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NEW QUESTION # 68
You are implementing traffic engineering in your MPLS network. You must ensure that the MPLS routes are used to traverse your network. Your solution should not affect IGP routes in your route tables.
In this scenario, which traffic engineering setting will accomplish this behavior?
Answer: A
Explanation:
To ensure that MPLS traffic-engineered routes are used without affecting IGP routes in the route tables, the mpls-forwarding traffic engineering setting should be used. This setting allows MPLS to influence forwarding without changing the IGP route selection.
NEW QUESTION # 69
Which two statements regarding GRE and IP-IP tunnels are correct? (Choose two.)
Answer: A,C
Explanation:
In Juniper Networks Junos OS,Generic Routing Encapsulation (GRE)andIP-in-IP (IP-IP)are common tunneling mechanisms used to transport packets across a network by encapsulating them within another protocol. Understanding the header structure and the limitations of these protocols is essential for proper MTU (Maximum Transmission Unit) management and security design.
Overhead (Option A):
Both GRE and IP-IP tunnels operate by adding an additional IP header to the original packet. An IP-IP tunnel (Protocol 4) adds a20-byteIPv4 header. A GRE tunnel (Protocol 47) adds the same20-bytedelivery IP header plus a minimum4-byteGRE header (totaling 24 bytes, which can increase if keys or sequencing are used).
Because these headers are added to the payload, the total size of the packet increases. This "overhead" means that if the original packet was already at the MTU limit (e.g., 1500 bytes), the encapsulated packet will exceed it, potentially leading to fragmentation or the need to adjust theTCP MSS (Maximum Segment Size).
Encryption (Option D):
Crucially, according to Juniper Service Provider documentation, neither GRE nor IP-IP provides native encryptionor data confidentiality. They are encapsulation protocols, not security protocols. The payload remains in cleartext and is visible to any device along the path. If security and encryption are required for data traversing these tunnels, they must be combined withIPsec (IP Security). While GRE is often used as the
"carrier" for IPsec (to allow multicast or dynamic routing protocols which IPsec alone does not support), the GRE protocol itself remains an unencrypted delivery mechanism. Therefore, statements A and D accurately describe the architectural behavior of these tunnel types.
NEW QUESTION # 70
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 # 71
Exhibit:
Referring to the exhibit, R1 and R2 are configured to run IS-IS. The IS-IS adjacency between R1 and R2 is up. What does the output of the show isis interface command tell you about R1?
Answer: C
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol as implemented in Junos OS, routers can operate at two hierarchical levels:Level 1 (L1)for intra-area routing andLevel 2 (L2)for inter-area backbone routing. By default, a Juniper router and its interfaces are configured to act asLevel 1/2, meaning they will attempt to form adjacencies at both levels simultaneously.
According to Juniper Networks technical documentation, the show isis interface command provides a granular view of how the protocol is interacting with specific local links. In the provided exhibit, we must examine the L (Level)column and theDR (Designated Router)status columns to understand R1's operational state.
* Level Configuration:Under the L column for both the physical interface ge-0/0/0.0 and the loopback lo0.0, the value is strictly2. This indicates that these interfaces have been explicitly configured to operate only at Level 2.
* Adjacency Capabilities:For the interface ge-0/0/0.0, the Level 1 DR field is marked asDisabled. This confirms that R1 is not participating in Level 1 operations on this link; it will not transmit Level 1 Hello PDUs, nor will it listen for them. Consequently, R1 is incapable of forming a Level 1 adjacency with R2 on this segment.
* Metric Implications:The exhibit shows an L1/L2 Metric of100/100. In Junos, "narrow" metrics (the default) are limited to a maximum value of 63 per interface. A metric of 100 indicates thatwide metrics (wide-metrics-only) have been enabled. Therefore, option A is incorrect because the routerisusing wide metrics.
Since the prompt states the adjacency is "up," and the interface is restricted to Level 2, we can conclude that R1 only forms a Level 2 adjacency with R2 (Option B). Even though an L1 metric of 100 is displayed in the table as a configured value, it is not actually "advertised" in a Link-State PDU because the Level 1 protocol is disabled on that interface.
NEW QUESTION # 72
What are two types of BGP messages exchanged while in the Established state? (Choose two.)
Answer: A,C
Explanation:
In theBorder Gateway Protocol (BGP)finite state machine (FSM), theEstablishedstate is the final and functional stage of a BGP peering session. According to Juniper Networks technical documentation, once a session reaches this state, the two peers have successfully exchanged Open messages and agreed upon session parameters (such as AS numbers, hold timers, and BGP identifiers). Only after the session is "Established" can the routers begin the actual exchange of network layer reachability information (NLRI).
The most frequent message type exchanged in the Established state is theUPDATEmessage. These messages are the heart of BGP operations; they are used to advertise new feasible routes to a peer or to withdraw routes that are no longer reachable. An UPDATE message contains path attributes (like AS-Path, Next-Hop, and Local Preference) and the associated prefixes. In a stable network, UPDATE messages are only sent when there is a change in the topology, adhering to BGP's incremental update philosophy.
The second message type that can be exchanged in this state is theNOTIFICATIONmessage. While ideally, a session stays established, any detected error-such as a hold timer expiration, a malformed update, or a manual "clear" command-will trigger the transmission of a NOTIFICATION message. This message informs the peer of the specific error code and immediately causes the BGP session to transition back to the Idle state, tearing down the TCP connection.
It is important to note thatOPENmessages (Option A) are only used during the session initialization phase to transition from the OpenConfirm state to Established.REQUEST(Option B) is not a valid BGP message type defined in the standard (RFC 4271); the closest equivalent in functionality would be a Route-Refresh message, which is a separate extension. Therefore, in the context of standard BGP operations within the Established state, Updates and Notifications are the correct answers.
NEW QUESTION # 73
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