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| Section | Objectives |
|---|---|
| Service Provider Architecture & Junos Fundamentals | - Junos OS routing fundamentals
|
| BGP and Routing Policy | - BGP fundamentals
|
| OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| MPLS and Service Provider Technologies | - VPN services
|
| Troubleshooting and Operations | - Performance and monitoring
|
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NEW QUESTION # 29
A service provider is onboarding a new enterprise customer that operates multiple branch offices, each with its own set of VLANs. The customer requires transparent Layer 2 connectivity between sites while maintaining separation of internal VLANs. The provider must also ensure that customer VLAN identifiers do not conflict with other customers on the shared infrastructure. Which solution would provide the desired results?
Answer: B
Explanation:
In a service provider environment,Q-in-Q tunneling(also known as 802.1ad or double-tagging) is the standard solution for transporting multiple customer VLANs over a shared provider backbone while maintaining total separation.
According to Juniper Networks documentation, Q-in-Q works by adding a second 802.1Q tag (theService Provider tagor S-tag) to the customer's already tagged frames (theCustomer tagor C-tag). This creates a
"tunnel" at Layer 2. This solution specifically addresses all the customer's requirements:
* Transparent Layer 2 Connectivity:Because the provider simply encapsulates the customer's frames, the customer's internal BPDU traffic (like Spanning Tree) and VLAN tags are preserved and delivered transparently to the remote site.
* Separation of Internal VLANs:The customer can run their own internal VLAN IDs (1-4094) without the provider needing to know or manage them.
* Conflict Avoidance:Different customers on the same provider infrastructure are assigned unique S- tags. Even if two different customers both use "VLAN 10" internally, they remain isolated because their traffic is encapsulated in different provider S-tags.
Why other options are incorrect:
* Layer 3 VPN (Option B):While MPLS L3VPNs are common, they provide Layer 3 (IP) connectivity, not the "transparent Layer 2" connectivity requested.
* GRE Tunnels (Option C):GRE is a Layer 3 encapsulation and does not natively provide the transparent VLAN bridging required for a multi-site Layer 2 service.
* NAT/Firewall (Option D):These are security and address-translation services for internet access and do not facilitate site-to-site Layer 2 bridging.
NEW QUESTION # 30
Referring to the exhibit, which statement is true about VRRP?
Answer: D
Explanation:
The exhibit shows the show vrrp summary output from two routers, with both routers listing the state of their VRRP group as master. VRRP allows for multiple routers to share a virtual IP address and a virtual MAC address, but usually, only one router is the master at any given time while others are in backup state. However, in some configurations, VRRP can operate in an active/active mode where multiple routers handle traffic simultaneously for load sharing. Since both routers show the state as master and there is no evidence of misconfiguration in the virtual IP addresses or priority, it indicates that VRRP is likely functioning in an active/active setup.
NEW QUESTION # 31
The MPLS Label Information Base (LIB) is stored in which table?
Answer: D
Explanation:
The MPLS Label Information Base is maintained in the mpls.0 routing table. This table stores the mappings between MPLS labels and their corresponding forwarding actions, allowing the router to perform label switching for MPLS packets.
NEW QUESTION # 32
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?
Answer: B
Explanation:
When designing High Availability (HA) for Juniper Service Provider routers, understanding the interaction between the control plane and data plane is vital. The user has already enabledGraceful Routing Engine Switchover (GRES), which synchronizes the interface and kernel state between the primary and backup Routing Engines (REs). However, GRES by itself does not preserve the routing protocol state (like OSPF adjacencies or BGP sessions).
To achieve the preservation of the routing protocol state without relying on external "helper" routers, you must implementNon-Stop Active Routing (NSR). According to Juniper Networks documentation, NSR uses the infrastructure provided by GRES to also synchronize the routing protocol process (rpd) information.
Under NSR, the backup RE maintains a "hot" standby state of all routing protocols. If the primary RE fails, the backup RE takes over immediately. Because it already possesses the full routing table and peer session states, the peering neighbors are unaware that a switchover occurred. No protocol adjacency resets occur, and traffic continues to flow uninterrupted.
It is crucial to differentiate NSR fromGraceful Restart (Option C). While Graceful Restart also aims to maintain traffic flow during a switchover, itdoesrequire help from neighboring routers (known as "helper mode"). If the neighbors do not support or are not configured for Graceful Restart, the sessions will drop.
Since the user explicitly stated they want to "avoid relying on helper routers," Graceful Restart is not the correct solution.
Non-stop Active Bridging (Option A)provides a similar "hitless" failover but specifically for Layer 2 environments (STP/VLANs) rather than Layer 3 routing protocols.BFD (Option B)is a failure detection protocol used to speed up convergence but does not preserve state during an RE failover; in fact, without NSR, BFD would likely trigger a faster teardown of the session during a switchover. Therefore,NSRis the only feature that meets the requirement for independent control-plane preservation.
NEW QUESTION # 33
A service provider receives multiple BGP routes to the same destination prefix. Each route has a different AS path length, but all other attributes are equal.
In this scenario, which statement is correct?
Answer: B
Explanation:
When multiple BGP routes to the same destination have identical attributes except for the AS path length, the BGP best-path selection process prefers the route with the shortest AS path. A shorter AS path indicates a potentially more direct path to the destination and is therefore chosen as the active route.
NEW QUESTION # 34
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