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| Section | Objectives |
|---|---|
| Topic 1: Protocol-Independent Routing | - Demonstrate knowledge of how to configure, monitor, or troubleshoot various protocol-independent routing components
|
| Topic 2: Multiprotocol Label Switching (MPLS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot MPLS
|
| Topic 3: IPv6 | - Identify the concepts, operation, or functionality of IPv6
|
| Topic 4: Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
| Topic 5: Open Shortest Path First (OSPF) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot OSPF
|
| Topic 6: Layer 2 Bridging or VLANs | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Layer 2 bridging or VLANs
|
| Topic 7: Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
| Topic 8: Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
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質問 # 127
What is the default export behavior of IS-IS in the Junos OS?
正解：C
解説：
In the Junos OS, routing policy behavior is governed bydefault import and export rulesthat vary significantly between different protocols. ForIS-IS (Intermediate System to Intermediate System), the default export policy is "reject all." This means that, by default, an IS-IS process willexport nothingfrom the routing table into the IS-IS database.
According to Juniper Networks technical documentation, IS-IS automatically advertises its own direct interfaces that are configured under the [edit protocols isis] hierarchy. However, it does not automatically redistribute routes learned from other sources-such asStatic routes,OSPF, orBGP-into the IS-IS domain.
This is a safety mechanism designed to prevent accidental routing loops or the flooding of unnecessary prefixes into the link-state database (LSDB), which could impact the stability of the SPF (Shortest Path First) algorithm.
To move routes from the routing table (inet.0) into IS-IS, an administrator must explicitly create arouting policyand apply it as anexport policywithin the IS-IS configuration. For example:
Code snippet
set policy-options policy-statement REDIST-STATIC term 1 from protocol static set policy-options policy-statement REDIST-STATIC term 1 then accept set protocols isis export REDIST-STATIC Without such a policy, the IS-IS LSPs (Link-State PDUs) will only contain information about the IS-IS enabled interfaces and the reachability of other IS-IS neighbors. This behavior contrasts with protocols like BGP, which has different default rules for exporting active BGP routes to EBGP peers. In the context of IS-IS in a Juniper environment, "export nothing" is the standard operational baseline.
質問 # 128
You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the DIS election in this scenario?
正解：B
解説：
A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also configured on the IS- IS interface. If routers in the network have the same priority, then the router with the highest MAC address is elected as the designated router. By default, routers have a priority value of 64.
質問 # 129
The LSP is not establishing correctly.
Referring to the exhibit, what should you do to solve the problem?
正解：B
解説：
The exhibit shows that the Label Switched Path (LSP) is down. One common reason for this could be that the IGP is not providing traffic engineering information to the MPLS process. Since the exhibit shows the OSPF configuration, enabling traffic engineering extensions for OSPF would allow OSPF to distribute the labels and traffic engineering information necessary for LSP establishment.
質問 # 130
What prevents routing loops in a single-area OSPF network?
正解：B
解説：
OSPF uses the Dijkstra shortest path first (SPF) algorithm to calculate loop-free paths through the network based on the link-state database. Because every router has a synchronized view of the network topology and independently runs the SPF algorithm, the resulting routing table calculations inherently prevent routing loops.
質問 # 131
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE).
You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state.
In this scenario, which feature would accomplish this behavior?
正解：A
解説：
Nonstop Active Routing (NSR) synchronizes routing protocol state information between the primary and backup Routing Engines so that protocol sessions remain active during a Routing Engine switchover. Because the protocol state is maintained internally on the router, neighbors are not required to support or act as helpers, allowing routing protocols such as BGP and OSPF to continue operating without session resets.
質問 # 132
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