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| Section | Weight | Objectives |
|---|---|---|
| VXLAN | 20% | - VXLAN configuration and monitoring - VXLAN troubleshooting - VXLAN control plane and data plane operation |
| Data Center Interconnect | 15% | - Inter-fabric stitching - EVPN-VXLAN based DCI - Layer 2 and Layer 3 interconnect |
| Layer 3 Fabrics | 20% | - IP fabric architecture and design - Fabric scaling and high availability - Routing protocols in IP fabrics |
| Data Center Deployment and Management | 20% | - Zero Touch Provisioning (ZTP) - Software upgrades and management - Configuration management and automation |
| Data Center Architecture and Security | 5% | - Traffic protection and segmentation - Security features in data center networks |
| EVPN-VXLAN Signaling | 20% | - MBGP for EVPN - MAC learning and symmetric routing - EVPN concepts and route types - CRB and ERB architectures |
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NEW QUESTION # 59
Exhibit.
You are troubleshooting an IP fabric (or your data center. You notice that your traffic is not being load balanced to your spine devices from your leaf devices. Referring to the configuration shown in the exhibit, what must be configured to solve this issue?
Answer: B
Explanation:
Step 1: Understand the Configuration in the Exhibit
The exhibit provides three configuration snippets from a leaf device (user@leaf#):
* Policy Options:
user@leaf# show policy-options
policy-statement load-balance {
term 1 {
then {
load-balance per-packet;
}
}
}
* A policy named load-balance is defined, which applies the load-balance per-packet action. In Juniper terminology, per-packet actually means per-flow load balancing (a common point of confusion). This policy is intended to enable load balancing across multiple paths.
* Routing Options:
user@leaf# show routing-options
router-id 192.168.100.11;
autonomous-system 65100;
* The router ID is set to 192.168.100.11, and the autonomous system (AS) number is 65100. There' s no mention of applying the load-balance policy here, which is a clue to the issue.
* BGP Configuration:
user@leaf# show protocols
bgp {
group spine {
type external;
export direct;
local-as 65003;
multipath {
multiple-as;
}
neighbor 172.16.1.5 {
peer-as 65001;
}
neighbor 172.16.1.17 {
peer-as 65002;
}
}
}
* BGP is configured with an external group spine, where the leaf device (local AS 65003) peers with spine devices (AS 65001 and 65002).
* The multipath multiple-as statement is enabled, which allows BGP to install multiple paths for the same prefix in the routing table, even if the paths come from different AS numbers. This is a prerequisite for load balancing in a multi-AS environment like an IP fabric.
* The export direct policy is applied, which likely exports directly connected routes to the spine devices.
Step 2: Identify the Problem
The issue is that traffic from the leaf to the spine devices is not being load-balanced, despite the presence of a load-balance policy and BGP multipath. For load balancing to work in this scenario:
* BGP multipath ensures multiple paths are installed in the routing table.
* The load-balance per-packet policy is meant to distribute traffic across those paths.
* However, the load-balance policy is defined but not applied anywhere in the configuration shown. For load balancing to take effect, the policy must be applied in the correct context.
Step 3: Evaluate the Options
Let's go through each option to determine the correct solution:
* A. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
* In Junos, to enable load balancing across multiple paths for forwarding, the load-balance policy must be applied at the forwarding table level. This is done under the routing-options hierarchy using the forwarding-table export statement. For example:
set routing-options forwarding-table export load-balance
* This ensures that the load-balancing policy is applied to the forwarding table, allowing traffic to be distributed across multiple equal-cost paths installed by BGP.
* B. The multipath multiple-as configuration must be configured for each peer in the BGP spine group.
* The multipath multiple-as statement is already configured under the spine group, and it applies to all neighbors in that group (172.16.1.5 and 172.16.1.17). There's no need to configure it per peer, as the group-level configuration is sufficient. This option is incorrect because the required setting is already in place.
* C. The load-balance policy must be applied as an export policy to your BGP.
* Applying the load-balance policy as a BGP export policy (e.g., export load-balance under the BGP group) would affect the routes advertised to the spine devices. However, the load-balance per-packet action is a forwarding action, not a route advertisement action. Applying it as a BGP export policy would not achieve the desired load balancing for traffic forwarding and is incorrect.
* D. The load-balance policy must have a from statement that matches on protocol bgp.
* The load-balance policy currently applies the load-balance per-packet action unconditionally (no from statement). Adding a from protocol bgp condition would make the policy apply only to BGP routes, but this is unnecessary in this context. The policy needs to be applied to the forwarding table to affect traffic, not modified with a from statement. This option doesn't address the core issue of applying the policy.
Step 4: Determine the Correct Answer
The key issue is that the load-balance policy is defined but not applied. For load balancing to work, it must be applied to the forwarding table under routing-options. This matchesOption A:
* A. The load-balance policy must be applied to the forwarding table under the routing-options hierarchy.
Step 5: Provide Official Juniper Documentation Reference
Since I don't have direct access to Juniper's proprietary documents, I can provide an explanation based on standard Junos documentation practices and publicly available resources, such as the Juniper TechLibrary, which is the official source for Junos configuration guides.
In Juniper's official documentation, specifically in theJunos OS Routing Protocols and Policies Configuration Guide, the process for enabling load balancing is described as follows:
* Load Balancing in Junos: To enable per-flow load balancing across multiple paths, you must define a policy with the load-balance per-packet action and apply it to the forwarding table. The relevant configuration hierarchy is:
routing-options {
forwarding-table {
export <policy-name>;
}
}
* Explanation from Documentation: The load-balance per-packet action (which performs per-flow balancing) requires the policy to be applied at the forwarding-table level to influence how traffic is distributed across multiple paths in the forwarding table. Without this, even if BGP installs multiple paths (via multipath), the forwarding engine will not load-balance traffic.
This aligns with the JNCIP-DC exam objectives, which include understanding how to configure and troubleshoot load balancing in an IP fabric, such as applying policies for traffic distribution.
NEW QUESTION # 60
You are asked to deploy 100 QFX Series devices using ZTP Each OFX5120 requires a different configuration. In this scenario, what are two components that you would configure on the DHCP server?
(Choose two.)
Answer: B,C
Explanation:
* Zero Touch Provisioning (ZTP):
* ZTP allows for the automated configuration of network devices, like QFX Series switches, without manual intervention. During ZTP, a switch will obtain its configuration from a DHCP server and then download the required software and configuration files from a specified server (e.
g., FTP, HTTP).
* DHCP Server Configuration:
* Option B:The DHCP server needs to know theMAC address for each QFX5120to provide a specific configuration based on the device identity. By mapping the MAC address to a particular configuration, the DHCP server can ensure that each switch gets the correct configuration.
* Option D:Themanagement IP address for each QFX5120must also be assigned by the DHCP server. This IP address allows the device to communicate on the network and access the configuration files and other required resources during the ZTP process.
Conclusion:
* Option B:Correct-MAC addresses allow the DHCP server to identify each QFX5120 and assign the appropriate configuration.
* Option D:Correct-Management IP addresses are essential for network communication during ZTP.
NEW QUESTION # 61
You are asked to build redundant gateways in your EVPN-VXLAN environment, but you must conserve address space because these gateways must span across seven PEs.
What should you implement on the PEs to satisfy these requirements?
Answer: D
Explanation:
In an EVPN-VXLAN environment, when you need redundant gateways across multiple PEs (for hosts in the same VLAN/VRF), you want all PEs to present a single logical gateway IP to the hosts.
This is achieved using anycast IRB:
Same IP address on all PEs → ensures hosts have a single default gateway.
Same MAC address on all PEs → ensures traffic is correctly forwarded to the closest PE without ARP conflicts.
This design conserves IP address space because you don't need a unique gateway IP for each PE.
NEW QUESTION # 62
You are asked for TX and RX traffic statistics for each interface to which an application server is attached. The statistics need to be reported every five seconds. Using the Junos default settings, which telemetry method would accomplish this request?
Answer: D
Explanation:
Native Sensors: Junos provides "Native Sensors" as part of its telemetry capabilities, which can be used to gather interface statistics like TX (transmit) and RX (receive) traffic. With the default configuration, native sensors can be configured to report traffic statistics at a specified interval, such as every five seconds, making this the correct method to fulfill the requirement for periodic traffic reporting.
NEW QUESTION # 63
Click the Exhibit button.
The 192.168.0.0/24 route is being advertised into your IP fabric by the leaf devices in AS 65511 and AS 65512. Both spine devices receive the routes from each of the leaf devices.
In this scenario, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
The two advertisements for the same prefix arrive with different next hops, but the default BGP behavior in Junos is to select a single best path for installation; additional paths are not kept as usable next hops unless multipath is explicitly enabled, so the nonselected next hop is not used.
Also, Junos will not advertise routes to BGP peers unless an export policy explicitly permits them; when it does export, it advertises only the selected active route, not multiple equal candidates.
NEW QUESTION # 64
......
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