Most Recent Juniper JN0-683 Exam Questions & Answers

Understanding sFlow Monitoring:

sFlow is a packet sampling technology used to monitor traffic in a network. It sends sampled packet data and interface counters to an sFlow collector, which analyzes the traffic patterns.

Information Included in sFlow Datagram:

Option A: The datagram sent to the sFlow collector includes information about the interface through which the packets entered the agent (the switch or router). This is crucial for understanding where in the network the traffic was captured.

Option D: sFlow datagrams also include the source and destination VLAN for the sampled packets. This allows for detailed analysis of the traffic flow within different VLANs.

Conclusion:

Option A: Correct---The ingress interface is included in the sFlow datagram.

Option D: Correct---The source and destination VLANs are also included, providing context for the sampled traffic.

Understanding Network Architectures:

ERB (Edge Routed Bridging) architecture involves routing at the network's edge (leaf nodes), while traffic between leaf nodes is switched. This is commonly used in VXLAN-EVPN setups.

Analysis of the Exhibit:

The exhibit shows configurations related to routing instances, VXLAN, and VLANs, with VNIs being used for each VLAN. This setup is characteristic of an ERB architecture where each leaf device handles Layer 3 routing for its connected devices.

Conclusion:

Option B: Correct---The configuration shown corresponds to an ERB architecture where routing occurs at the network's edge (leaf devices).

Interconnecting Data Centers:

The scenario requires interconnecting two data centers with unique IP spaces across an IP backbone. The key point is that bridging is not required, so Layer 3 routing methods must be used.

EVPN Configuration:

Option B: Establishing EVPN peering between the border leaf nodes in each data center is the most appropriate solution as it allows for exchanging routing information between the two data centers. This ensures that the routes are properly distributed without the need for L2 bridging.

Option C: Configuring Type 5 EVPN routes is necessary for advertising IP prefixes (Layer 3 routes) across the EVPN. Type 5 routes allow for the exchange of IP prefixes between the two data centers, enabling the necessary routing functionality without the need for bridging.

Conclusion:

Option B: Correct---Peering between border leaf nodes sets up the necessary route exchange between data centers.

Option C: Correct---Type 5 EVPN routes are essential for exchanging Layer 3 prefixes between data centers.

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 the MAC address for each QFX5120 to 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: The management IP address for each QFX5120 must 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.

DHCP Behavior in Factory-Default Configuration:

Option B: In the factory-default configuration, Juniper switches are designed to send DHCP requests on all operational interfaces. This behavior ensures that the switch can obtain an IP address for management and further configuration from any available DHCP server.

Option D: The DHCP server can provide additional configuration parameters, including the required Junos version. This allows for automated provisioning and ensures that the switch is running the correct software version.

Conclusion:

Option B: Correct---The switch will use any operational interface to request an IP address via DHCP.

Option D: Correct---The DHCP server can specify Junos version requirements, enabling automated software management.