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| Section | Objectives |
|---|---|
| Layer 2 Bridging or VLANs | - Identify the concepts, benefits, or functionality of VLANs
|
| Protocol-Independent Routing | - Identify the concepts, operation, or functionality of various protocol-independent routing components
|
| Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
| Border Gateway Protocol (BGP) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP
|
| Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
| Open Shortest Path First (OSPF) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot OSPF
|
| IPv6 | - Identify the concepts, operation, or functionality of IPv6
|
| Multiprotocol Label Switching (MPLS) | - Identify the concepts, operation, or functionality of MPLS CoS processing on Junos devices
|
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NEW QUESTION # 142
What information is determined by using the AS path attribute included in the BGP update message? (Choose two.)
Answer: B,C
Explanation:
TheAS_PATHattribute is a "well-known mandatory" attribute in BGP, meaning it must be present in every BGP Update message exchanged between External BGP (eBGP) peers. It records the sequence of Autonomous System numbers that a route has traversed. Per Juniper Networks Service Provider documentation, this attribute serves two fundamental purposes:
1. Loop Prevention (Option B):
This is the most critical function of the AS_PATH. When a BGP router receives an update from an eBGP peer, it scans the AS_PATH attribute for its own AS number. If the router finds its local AS number already listed in the path, it concludes that the route has already passed through its network and has "looped" back. To prevent an infinite routing loop, the router will immediately discard the update. This mechanism is the cornerstone of BGP's stability as a path-vector protocol.
2. Path Selection / Shortest Path Determination (Option C):
BGP uses a complex "tie-breaking" algorithm to select the best path among multiple candidates. One of the highest-ranking criteria in this algorithm (after Weight, Local Preference, and AS_PATH length) is the length of the AS_PATH. A shorter AS_PATH (fewer AS numbers listed) is generally preferred over a longer one, as it typically represents a more direct path through the internet hierarchy.
Why other options are incorrect:
* Option A:The "origin" of a route (IGP, EGP, or Incomplete) is determined by theORIGINattribute, which is a separate well-known mandatory attribute.
* Option D:BGP does not count individual "next-hop devices" (which would be an IGP metric like hop count in RIP); it only tracks Autonomous Systems. A single AS in the path might contain hundreds of internal routers (next-hops), but BGP only sees it as one "hop" in the AS_PATH.
NEW QUESTION # 143
Click the Exhibit button. The routers shown in the exhibit are configured for segment routing. In this scenario, what is the adjacency SID that Router B advertises to Router A?
Answer: B
Explanation:
The diagram you provided shows two routers, Router A and Router B, with MPLS labels between them. In the context of segment routing with MPLS, each router advertises a set of SIDs (Segment Identifiers). These SIDs can be node SIDs, which are associated with the router itself, or adjacency SIDs, which are associated with the links between routers.
Given the information from the exhibit:
Router A has a Router ID of 10.1.1.1 and is associated with the MPLS label 11. Router B has a Router ID of 10.1.1.2 and is associated with the MPLS label 12. The adjacency SID in segment routing is used to identify a specific adjacency between two routers. In this case, the question is asking for the adjacency SID that Router B advertises to Router A. This would be the label that Router B tells Router A to use to send packets directly to Router B over their shared adjacency.
So, the adjacency SID that Router B advertises would be associated with the link that Router A would use to send traffic to Router B, which is labeled with the number 12 in the exhibit.
NEW QUESTION # 144
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: C,D
NEW QUESTION # 145
What are three well-known mandatory BGP attributes? (Choose three.)
Answer: C,D,E
Explanation:
Well-known mandatory:Recognized by all BGP peers, passed to all peers, and present in all Update messages. Well-known mandatory attributes include:- Next-hop- Origin- AS PATH Well- known discretionary:Recognized by all routers, passed to all peers, and optionally included in the Update message. Well-known discretionary attributes include:- Local Preference- Atomic Aggregate Optional transitive:Possibly recognized by BGP routers and passed to BGP peers.
Optional transitive attributes are marked as partial when not recognized.
Optional transitive attributes include:- Aggregator- Community
Optional non-transitive:Possibly recognized by BGP routers but not passed to peers.
Optional non- transitive attributes include:- Multi-exit discriminator (MED)-Originator ID-Cluster-ID The three well-known mandatory BGP attributes that must be present in every BGP update message are:
Next Hop: Indicates the next hop IP address to reach the advertising BGP peer.
Origin: Indicates how the route was originated, whether it was via IGP, EGP, or incomplete. AS Path: Lists the autonomous systems that the update has traversed.
NEW QUESTION # 146
You are asked to configure the OSPF environment to prevent the DRother routers from participating in DR/BDR election.
Referring to the exhibit, which command will accomplish this task?
Answer: A
Explanation:
To prevent a router from participating in the OSPF designated router (DR) and backup designated router (BDR) election process, you set the OSPF priority to 0 on the interfaces of that router. This tells OSPF that the router on those interfaces is not to be considered for election as either DR or BDR, effectively making them DRother routers. The exhibit indicates that this is the desired configuration, and therefore the correct command to issue on the Juniper device would be to set the priority to 0 on the relevant interfaces.
NEW QUESTION # 147
......
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