JN0-682 Practice Exam Questions with Answers Data Center Professional (JNCIP-DC) Certification

BGP Additional Paths in EVPN-VXLAN environments enable the advertisement of multiple paths through BGP, which provides faster network convergence in the event of a leaf node link failure. This is especially important in large-scale networks with thousands of MAC addresses.

In a scenario where RSVP and LDP are restricted, and routes are not appearing in the inet table, the use of "bgp family inet labeled-unicast per-group-label" becomes necessary. This setting is crucial in environments where label distribution protocols like RSVP or LDP are not used. It enables the use of MPLS labels in BGP without relying on these protocols, which is essential for integrating L3VPN with EVPN over WAN links that do not support RSVP or LDP. The “per-group-label” option ensures that a single label is used for all routes exchanged with a BGP neighbor, which simplifies label management and conserves label space.References:

• Junos OS Routing Protocols Library for Routing Devices

B. Virtual Router Redundancy Protocol (VRRP) ensures high availability by allowing multiple routers to work together to provide network resilience.

C. Graceful Routing Engine switchover (GRES) allows for the seamless transition of control plane functions between Routing Engines, ensuring continuous operation of the network.

D. Dual Routing Engines provide a hardware-based high-availability solution, where a backup Routing Engine takes over in case the primary fails, ensuring uninterrupted network service.

In ZTP, the image storage service and the DHCP server can be running on different server hosts, allowing for flexibility in network design. When a switch is booted, DHCP requests are sent through both the management interface

and attached revenue ports. This ensures that the switch can retrieve its configuration from the network regardless of how it's connected.References:

• Zero Touch Provisioning Guide

When a packet is encapsulated by VXLAN, a VXLAN Network Identifier (VNI) is placed in the VXLAN header. This VNI is crucial as it maps to the VLAN-ID, ensuring that the packet is correctly identified and routed within the overlay network.

References:

• Juniper Networks - VXLAN Overview

B. The IP address of the FTP server must be specified so that the QFX Series devices know where to retrieve their configuration files.

D. The MAC address of each QFX5100 is necessary to ensure that each switch receives the correct configuration file. This can be specified in the DHCP server to map each MAC address to its corresponding configuration file.

Increasing the physical MTU on all ports of devices participating in a VXLAN EVPN signaling network is essential. VXLAN encapsulation adds additional bytes to the Ethernet frame, which can lead to packet drops if the MTU is not large enough to accommodate the increased frame size. Ensuring that the physical MTU is set correctly on all devices allows for successful transmission of VXLAN encapsulated packets.

References:

• Juniper Networks - Understanding VXLANs

The endpoint of a VXLAN tunnel is known as a VTEP (VXLAN Tunnel Endpoint). VTEPs are responsible for encapsulating and de-encapsulating the traffic sent over the VXLAN network.

References:

• Juniper Networks - VXLAN Overview

A. Scaling limitations are a critical factor in selecting spine devices as they determine how well the network can grow and adapt to increasing demands. C. Port density is another key consideration, as it impacts the number of connections that the spine devices can handle, which is crucial for supporting a large number of leaf devices in an IP fabric.

The Contrail Command user interface supports various functions including configuring management domains and creating virtual networks. It provides an integrated platform for managing and configuring network resources in a centralized manner.

References:

• Juniper Networks - Contrail Networking Documentation

In a Clos data center network, scaling the available bandwidth to support more east-west traffic can be effectively achieved by either adding more leaf devices (A) or more spine devices (C). Adding leaf devices increases the total number of endpoints in the network, thereby providing additional paths and bandwidth for east-west traffic. Similarly, adding spine devices increases the interconnectivity within the network, offering more paths for traffic to flow through, which helps in handling higher volumes of east-west traffic. Both approaches work towards enhancing the overall capacity and efficiency of the network.References:

• Juniper Networks - Understanding Clos Networks
• Juniper Networks - Data Center Network Design Considerations

ICCP (Inter-Chassis Control Protocol) is the protocol used to replicate forwarding information between MC-LAG (Multi-Chassis Link Aggregation Group) peers. It ensures coordination and consistency of state between the MC-LAG devices.

References:

• Juniper Networks - Understanding MC-LAG

To enable ECMP (Equal-Cost Multi-Path) routes in the Routing Information Base (RIB) in an EBGP-based IP fabric, you should enable the 'multipath multiple-as' BGP parameter. This setting allows the use of multiple paths for BGP routes even when they come from different autonomous systems, which is key in a typical EBGP deployment in a data center IP fabric.References:

• BGP and Multipath Routing

The Ethernet segment router in EVPN is responsible for preventing BUM traffic from looping back to a multi-homed host. It ensures that BUM traffic is properly handled in scenarios where hosts are connected to multiple leaf nodes.

A. IBGP is recommended for VXLAN stitching overlays because it provides better scalability and stability within the same administrative domain, which is crucial for seamless EVPN-VXLAN stitching.

D. The interconnect gateway can indeed reside on the super spine layer of a multi-POD data center. This placement facilitates interconnectivity and scaling in large, distributed network architectures.

The Junos Telemetry Interface (JTI) is the ideal solution for monitoring and telemetry in an IP fabric using QFX Series devices. JTI uses a push model to stream system event data and statistical data from the devices. It provides real-time, granular monitoring capabilities, which is more efficient and scalable compared to

traditional polling methods like SNMP. By pushing data to a telemetry server, JTI allows for more dynamic and immediate insights into network performance and health.References:Juniper Networks QFX Series Documentation - Junos Telemetry Interface.

B. service-type vlan-aware allows for multiple VLANs to be associated with a single bridge domain. D. instance-type virtual-switch is used for creating a single bridge domain to accommodate multiple VLANs.

Logical systems allow each tenant to configure their own logical interfaces and support all routing features. This setup is ideal for hosting businesses looking to provide independent networking environments to multiple tenants.

In an EVPN-VXLAN environment, to ensure that multicast traffic is delivered only to leaf devices with interested receivers, IGMP snooping is required. IGMP snooping enables the leaf devices to listen to IGMP report and leave messages from hosts and make forwarding decisions based on this information. This way, multicast traffic is only forwarded to ports with interested multicast group members, optimizing bandwidth and resource utilization.References:

• EVPN-VXLAN Configuration Guide

Setting the Virtual Chassis as auto-provisioned (A) and configuring the auto-sw-update parameter (D) are key to enabling plug-and-play functionality for line card switches in an active VCF. This ensures that new line cards are automatically recognized and updated to the correct Junos version without manual intervention.

References:

• Juniper Networks - Virtual Chassis Fabric Configuration Guide

To accommodate the extra header information added by VXLAN, which can be 50 to 54 bytes, it's necessary to increase the MTU (Maximum Transmission Unit) on the physical interfaces connected to the VXLAN network. This ensures that the larger frames can be transmitted without fragmentation, maintaining efficient network performance.

In an EBGP-based IP fabric architecture, the spine nodes form peering relationships with both other spine nodes and leaf nodes. However, the leaf nodes are configured to only form peering relationships with the spine nodes, not with other leaf nodes. This hierarchical approach simplifies the network topology and routing.

References:

• Juniper Networks - IP Fabric Architecture Guide

https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/data-center-interconnect-evpn-vxlan-evpn-mpls-wan-overview.html

A. GPB (Google Protocol Buffers) and C. JSON are two common formats supported for streaming network analytics data.

https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/ztp-configuring.html 6. Configure the following DHCP option 43 suboptions: • Suboption 01: The name of the script or configuration file to install.

C. Multicast group must match on the VTEPs in the same VXLAN segment to ensure that they can properly participate in the same broadcast domain. D. VNI (VXLAN Network Identifier) must also match to ensure that all VTEPs are part of the same VXLAN overlay network.