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| Section | Objectives |
|---|---|
| Topic 1: Multicast | - Multicast Routing
|
| Topic 2: Layer 2 VPNs | - L2VPN Technologies
|
| Topic 3: IGP | - OSPF
|
| Topic 4: BGP | - Advanced BGP Features
|
| Topic 5: MPLS | - RSVP and Traffic Engineering
|
| Topic 6: Layer 3 VPNs | - L3VPN Deployment
|
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質問 # 88
Exhibit
Based on the configuration contents shown in the exhibit, which statement is true?
正解：C
解説：
Explanation
BGP policy framework is a set of tools that allows you to control the flow of routing information and apply routing policies based on various criteria. BGP policy framework consists of several components, such as route maps, prefix lists, community lists, AS path lists, and route filters. Route maps are used to define routing policies by matching certain conditions and applying certain actions. Prefix lists are used to filter routes based on their prefixes. Community lists are used to filter routes based on their community attributes. AS path lists are used to filter routes based on their AS path attributes. Route filters are used to filter routes based on their prefix length or range3. In this question, we have a route map named ISP-A that has two clauses: clause 10 and clause 20. Clause 10 matches any route with a prefix length between 8 and 24 bits and sets the local preference to 200. Clause 20 matches any route with a prefix of 224.7.7.7/32 and rejects it. The route map is applied inbound on the BGP neighborship with ISP-A. Based on this configuration, the correct statement is that joins for group 224.7.7.7 are always rejected, regardless of the group count. This is because clause 20 explicitly denies any route with a prefix of 224.7.7.7/32, which corresponds to the multicast group 224.7.7.7.
質問 # 89
You are using a Layer 3 VPN to connect two customer sites. The VPN routes for the customer networks appear as hidden in the bgp.l3vpn.0 routing table on the PE routers.
What is causing this problem?
正解：A
質問 # 90
Referring to the exhibit, the 10.0.0.0/24 EBGP route is received on R5; however, the route is being hidden.
What are two solutions that will solve this problem? (Choose two.)
正解：A、B
質問 # 91
Exhibit
Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector In this scenario, which BGP feature should you configure to accomplish this behavior?
正解：A
解説：
BGP add-path is a feature that allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths. This behavior promotes path diversity and reduces multi-exit discriminator (MED) oscillations. BGP add-path is implemented by adding a path identifier to each path in the NLRI. The path identifier can be considered as something similar to a route distinguisher in VPNs, except that a path ID can apply to any address family. Path IDs are unique to a peering session and are generated for each network3. In this question, we have a route reflector (RR) that receives two routes for the same prefix (192.168.0.0/16) from an EBGP neighbor. By default, the RR will only advertise its best path to its clients (R1 and R2). However, we want R1 and R2 to receive both routes from the RR. To achieve this, we need to configure BGP add-path on the RR and enable it to send multiple paths for the same prefix to its clients.
質問 # 92
Exhibit
Which two statements about the configuration shown in the exhibit are correct? (Choose two.)
正解：C、D
解説：
The provided configuration is for a routing instance named VPN-A on a Juniper PE (Provider Edge) router. Let's break it down:
* Instance Type: VRF
* The instance-type vrf; statement indicates that this is a Layer 3 VPN (L3VPN) using MPLS VPNs (RFC 4364 - BGP/MPLS IP VPNs).
* This confirms that Option D (A Layer 3 VPN is configured) is correct #.
* VRF Target and Interface Association
* The vrf-target target:64512:1234; defines the route target (RT) for importing and exporting VPN routes.
* The interface ge-0/0/1.0; binds this interface to the VRF.
* BGP Configuration for CE (Customer Edge) Peering
* The group CE section configures external BGP (EBGP) (type external;).
* The neighbor 10.0.0.1 is in AS 64512 (peer-as 64512;).
* The as-override; statement is used.
Evaluating the Answer Choices
# Option B: "This VPN connects customer sites that use the same AS number."
* The as-override; command allows multiple customer sites that use the same AS number (64512) to communicate over the service provider's MPLS network.
* Normally, BGP prevents routes with the same AS in the AS_PATH from being accepted. The as- override feature replaces the customer's AS number with the provider's AS, ensuring proper route advertisement.
# This statement is correct.
# Option A: "This VPN connects customer sites that use different AS numbers."
* If the customer sites had different AS numbers, there would be no need for as-override.
* The as-override feature is specifically used when all customer sites share the same AS number, ensuring that BGP routes are accepted.
# This statement is incorrect.
# Option C: "A Layer 2 VPN is configured."
* A Layer 2 VPN (L2VPN) configuration would typically use instance-type l2vpn; or EVPN/VPLS- related parameters (e.g., protocols l2vpn or protocols vpls).
* Since this configuration uses instance-type vrf; and BGP with a VRF target, it is clearly a Layer 3 VPN (L3VPN).
# This statement is incorrect.
# Option D: "A Layer 3 VPN is configured."
* The instance-type vrf; confirms this is an MPLS Layer 3 VPN (L3VPN).
* VRFs, BGP, and route targets (vrf-target) are specific to Layer 3 VPNs.
# This statement is correct.
# B. This VPN connects customer sites that use the same AS number.
# D. A Layer 3 VPN is configured.
Verification from Juniper Documentation:
* Juniper BGP/MPLS Layer 3 VPNs Guide confirms that instance-type vrf is used for L3VPNs.
* Juniper BGP Configuration Guide states that as-override is applied when customer sites use the same AS number.
* RFC 4364 (BGP/MPLS IP VPNs) explains how route targets and VRFs are used in L3VPN deployments.
質問 # 93
......
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