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| Section | Weight | Objectives |
|---|---|---|
| Protocol-Independent Routing | 10-15% | - Filter-based forwarding - Routing instances and RIB groups - Load balancing - Static, aggregate, and generated routes - Martian addresses |
| Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Border Gateway Protocol (BGP) | 20-25% | - IBGP and EBGP - Basic operation and message types - Path selection and attributes - Configuration and troubleshooting - Policy and route filtering |
| Multiprotocol Label Switching (MPLS) | 12-18% | - Terminology and forwarding - Segment routing basics - Configuration and monitoring - LDP and RSVP - Labels and LIB |
| Open Shortest Path First (OSPF) | 15-20% | - Link-state database - LSA types and operation - Configuration and troubleshooting - Areas and router types |
| High Availability | 5-8% | - NSR and GRES concepts - Nonstop active routing - Graceful restart |
| Intermediate System to Intermediate System (IS-IS) | 10-15% | - Metrics and wide metrics - Configuration and monitoring - PDUs and TLVs - Adjacencies and levels |
| Spanning Tree Protocols | 8-12% | - BPDU and protection features - Port roles and states - STP, RSTP, MSTP, VSTP - Configuration and convergence |
| Layer 2 Bridging and VLANs | 8-12% | - Bridging concepts - VLANs and trunking - Service provider switching features |
| IPv6 | 8-12% | - Autoconfiguration - Address types and format - Static and dynamic routing - OSPFv3 and BGP for IPv6 |
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NEW QUESTION # 50
Which two statements are correct about TLVs in IS-IS? (Choose two.)
Answer: B,C
Explanation:
In the IS-IS protocol,TLVs (Type, Length, Value)are the fundamental building blocks used to carry information withinLink-State PDUs (LSPs). Unlike some other protocols that have a fixed, rigid packet format, IS-IS was designed from the ground up to be modular and extensible. This extensibility is achieved through the use of TLVs, which allow the protocol to carry different types of data without requiring changes to the core protocol state machine.
According to Juniper Networks technical documentation,TLVs allow flexible encoding of routing information (Option C). Each TLV specifies the "Type" of information it carries (such as neighbor information or IP reachability), the "Length" of that information, and the "Value" (the actual data). This architecture is what allowed IS-IS to easily support IPv6 by simply adding new TLVs (like TLV 236 for IPv6 reachability) without redesigning the protocol. It also supports Traffic Engineering (TE) extensions used in MPLS environments by adding TLVs that describe link bandwidth and administrative groups.
Furthermore, a singleLSP can contain multiple TLVs (Option D). When a Juniper router generates an LSP, it packs all the necessary information-such as the router's area addresses, its neighbors, and its local interface prefixes-into various TLVs and places them into a single PDU. If the amount of information exceeds the Maximum Transmission Unit (MTU) of the interface, the router will generate additional LSPs (fragmented LSPs) to carry the remaining TLVs.
Options A and B are incorrect because restricting an LSP to a single TLV would make the protocol incredibly inefficient, and the very nature of IS-IS is its ability to support multiple network layer protocols (not just IPv4) through its agnostic TLV-based transport.
NEW QUESTION # 51
Which statement about RSVP-signaled LSPs is correct?
Answer: C
Explanation:
In a Juniper Networks environment,Resource Reservation Protocol (RSVP)is a signaling protocol used to establish Label-Switched Paths (LSPs). While RSVP handles the actual signaling (requesting labels and reserving bandwidth along a path), it does not inherently know which path to take. This is whereConstrained Shortest Path First (CSPF)comes into play.
CSPFis an advanced version of the Dijkstra algorithm used specifically for traffic engineering. Unlike the standard SPF used by IGPs, which only considers the shortest metric, CSPF takes into account multiple constraints such as available bandwidth, link coloring (administrative groups), and explicit hop requirements.
According to Juniper technical documentation, when an LSP is configured, the Ingress router uses CSPF to calculate a loop-free path that satisfies all these constraints before RSVP begins signaling. This is why statementBis the correct description of the operational flow.
StatementDis a common distractor. While CSPF uses theTraffic Engineering Database (TED)to perform its calculations, the path is not "calculated by the TED" itself; the TED is merely the repository of link-state information (provided by OSPF or IS-IS extensions). StatementCrefers to Segment Routing Global Block (SRGB), which is relevant to Segment Routing (SR-TE), not standard RSVP-signaled LSPs. Finally, statement Ais incorrect because admin-groups (link coloring) are actually one of the primary constraints thatrequire CSPF to determine a valid path.
NEW QUESTION # 52
Which two protocols are capable of distributing labels for segment routing? (Choose two.)
Answer: B,C
Explanation:
Segment routing labels can be distributed by link-state routing protocols such as IS-IS and OSPF, which have been extended to support segment routing capabilities.
NEW QUESTION # 53
You are using RSVP in your network to signal MPLS LSPs. You are asked to ensure that the egress MPLS router receives the full label stack, containing both the hop-by-hop and VPN label.
Which configuration will satisfy this requirement?
Answer: C
NEW QUESTION # 54
Which two statements about graceful restart are correct? (Choose two.)
Answer: A,C
Explanation:
Graceful Restart (GR)is a high-availability mechanism designed to minimize the impact of a routing protocol process (rpd) restart or a Routing Engine (RE) switchover. It allows a router to continue forwarding traffic while the control plane is recovering, provided that the data plane (Packet Forwarding Engine) remains intact.
According to Juniper Networks documentation, Graceful Restart operates in two distinct roles:
* Restarting Mode:This is the role of the router that is actually undergoing the restart. In Junos OS, this mode isnot enabled by default (Option A). An administrator must explicitly configure graceful-restart under the [edit routing-options] hierarchy to allow the router to signal its neighbors that it is attempting a graceful recovery.
* Helper Mode:This is the role of the neighboring routers. When a neighbor sees a router restart, if it is in "helper mode," it will continue to forward traffic toward the restarting router and will not flush the associated routes from its forwarding table for a specified period. In Junos,helper mode is enabled by default (Option B)for most protocols (OSPF, BGP, IS-IS). This means that even if you haven't configured GR on your own router, it will automatically assist its neighbors if they perform a graceful restart.
Why other options are incorrect:
* Option C:WhileGRES (Graceful Routing Engine Switchover)is often usedwithGraceful Restart to handle hardware-level RE failures, they are independent features. GR can function during a simple software process restart without dual REs or GRES.
* Option D:Nonstop Bridging (NSB)is a separate high-availability feature for Layer 2 protocols (like STP). While it shares a similar goal, Graceful Restart is specifically a Layer 3 protocol mechanism (Layer 2 does not use "helper" routers in the same way).
NEW QUESTION # 55
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