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| Section | Objectives |
|---|---|
| Topic 1: Multiprotocol Label Switching (MPLS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot MPLS
|
| Topic 2: IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Topic 3: Layer 2 Bridging or VLANs | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Layer 2 bridging or VLANs
|
| Topic 4: Border Gateway Protocol (BGP) | - Identify the concepts, operation, or functionality of BGP
|
| Topic 5: Protocol-Independent Routing | - Demonstrate knowledge of how to configure, monitor, or troubleshoot various protocol-independent routing components
|
| Topic 6: Open Shortest Path First (OSPF) | - Identify the concepts, operation, or functionality of OSPF
|
| Topic 7: Intermediate System to Intermediate System (IS-IS) | - Identify the concepts, operation, or functionality of IS-IS
|
| Topic 8: Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
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NEW QUESTION # 64
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)
Answer: A,D
NEW QUESTION # 65
Referring to the exhibit, what will happen to untagged frames?
Answer: D
Explanation:
In the exhibit, the interface is configured with the native-vlan-id 20 parameter. This means that any untagged frames arriving on this interface will be associated with VLAN 20. The native VLAN serves as the default VLAN for untagged frames on a trunk port.
NEW QUESTION # 66
Exhibit:
Referring to the exhibit, you have configured R1, R2, R3, and R4 to be a part of OSPF area 0 and you have connected them to a broadcast segment. Assuming all four routers come online within one minute of each other, which router becomes the DR and which router becomes the BDR?
Answer: B
Explanation:
In OSPF networks, when multiple routers are connected to a shared multi-access broadcast segment (like an Ethernet switch), they undergo an election process to select aDesignated Router (DR)and aBackup Designated Router (BDR). This mechanism is essential for reducing the number of adjacencies and limiting the volume of Link State Advertisement (LSA) flooding on the segment.
The OSPF election process follows a strict hierarchy based on the following criteria:
* Interface Priority:The router with the highest OSPF interface priority is elected as the DR. The router with the second-highest priority becomes the BDR. In Junos, the default priority is 128, but it can be manually configured between 0 and 255.
* Router ID:If there is a tie in priority, the router with the numerically highest Router ID (RID) wins the election.
Analyzing the configuration provided in the exhibit:
* R1:Priority 200, Router-ID 192.168.1.1
* R2:Priority 100, Router-ID 192.168.1.2
* R3:Priority 50, Router-ID 192.168.1.3
* R4:Priority 90, Router-ID 192.168.1.4
Comparing the priority values,R1 has the highest priority (200)and therefore becomes theDR. The next highest priority value among the remaining routers is100, which belongs to R2, making it theBDR. Although R4 has a higher Router ID than R2, the priority value is evaluated first and takes precedence.
Since all routers came online within a short window (one minute), they participate in the same election cycle, ensuring the configured priorities dictate the outcome rather than "first-come, first-served" preemption behavior common in OSPF once a DR is already established.
NEW QUESTION # 67
What happens if an IS-IS router receives a link-state PDU with a higher sequence number than the one in its database?
Answer: A
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 # 68
Which BGP attribute is optional, transitive, and is passed unchanged to other BGP peers if not recognized?
Answer: D
Explanation:
BGP attributes are categorized into four distinct types based on how they are handled by a BGP speaker:Well- known mandatory,Well-known discretionary,Optional transitive, andOptional non-transitive.
Understanding these categories is essential for traffic engineering and ensuring consistent policy across an Autonomous System.
According to Juniper Networks technical documentation, theCommunityattribute is classified as anoptional transitiveattribute. The term "optional" implies that a BGP implementation is not required to support or recognize the attribute. However, because it is "transitive," if a Juniper router receives an update containing a community tag that it does not recognize or has no specific policy for, it must accept the attribute and pass it along to other BGP peers unchanged. This ensures that community-based policies can be signaled across intermediate ASes that may not be configured to act upon those specific tags.
In contrast:
* Origin (Option A)andAS Path (Option B)arewell-known mandatoryattributes. Every BGP update must include these, and every BGP-compliant router must recognize them.
* MED (Option D)(Multi-Exit Discriminator) is anoptional non-transitiveattribute. If a router receives a MED and advertises that route to an EBGP peer, the MED is typically stripped away (unless specific configurations like path-selection cisco-non-deterministic are used), as it is intended only to influence the immediate neighboring AS.
The Community attribute (defined in RFC 1997) is a powerful tool in Junos OS, often used for tagging routes to trigger specific routing policies, such as setting local preference or identifying the geographic origin of a prefix. By being transitive, it allows for sophisticated administrative control across complex multi-provider environments.
NEW QUESTION # 69
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