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| Section | Objectives |
|---|---|
| Topic 1: Intermediate System to Intermediate System (IS-IS) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS
|
| Topic 2: Border Gateway Protocol (BGP) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP
|
| Topic 3: Protocol-Independent Routing | - Demonstrate knowledge of how to configure, monitor, or troubleshoot various protocol-independent routing components
|
| Topic 4: Layer 2 Bridging or VLANs | - Identify the concepts, operation, or functionality of Layer 2 bridging for the Junos OS
|
| Topic 5: IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Topic 6: Open Shortest Path First (OSPF) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot OSPF
|
| Topic 7: Spanning Tree Protocols | - Identify the concepts, operation, or functionality of STP
|
| Topic 8: Multiprotocol Label Switching (MPLS) | - Identify the concepts, operation, or functionality of MPLS CoS processing on Junos devices
|
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NEW QUESTION # 121
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: C
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 # 122
For two or more switches to participate in the same MSTP region, which parameter must match?
Answer: A
Explanation:
For switches to participate in the same MSTP region, the MST region configuration must match across the devices. One of the required matching parameters is the region name, which identifies the MSTP region and ensures the switches treat each other as part of the same spanning-tree region.
NEW QUESTION # 123
Referring to the exhibit. You confirm that the R2 and R3 routers are receiving a BGP route to the
203.0.113.0/24 network, but both routers display the route as hidden. Referring to the exhibit, which two actions solve this problem? (Choose two.)
Answer: A,C
Explanation:
A route being hidden in BGP usually indicates a configuration that prevents it from being used, such as a next-hop that is not reachable.
B). Configuring a routing policy on R1 that sets the next-hop to the address used for IBGP peering ensures reachability of the next-hop within the local AS. D. Applying the correct routing policy as an export policy to the IBGP group on R1 will share the route with the IBGP peers, in this case, R2 and R3.
NEW QUESTION # 124
You are troubleshooting two OSPF routers that have an adjacency that remains in the ExStart state. What would cause this problem?
Answer: D
Explanation:
The problem occurs most frequently when you attempt to run OSPF between a Cisco router and another vendor router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces do not match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighbor router ignores the packet.
A mismatched Maximum Transmission Unit (MTU) setting on OSPF interfaces can cause routers to get stuck in the ExStart state. OSPF requires that both sides of a link have the same MTU to form a full adjacency.
NEW QUESTION # 125
Referring to the exhibit. Which two statements are correct about the service provider MPLS network shown in the exhibit? (Choose two.)
Answer: B,D
Explanation:
In MPLS, multiple paths can be merged if they share the same egress router. In the given scenario, traffic from Network 1 to Network 3 and Network 4 can be engineered to follow the same label- switched path (LSP) within the MPLS network until they reach the last common point before diverging to their respective destinations.
As for R3 performing label operations, in a typical MPLS network, intermediate routers (like R3) perform label swapping. They replace the incoming label with a new label before forwarding the packet along the LSP. A label pop operation is typically performed by the egress router in the case of an ultimate hop pop (UHP), where it removes the MPLS label before delivering the packet to the final destination outside the MPLS domain.
NEW QUESTION # 126
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