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Juniper JN0-683 Exam Sample Questions

Question # 1

You are deploying an IP fabric with an oversubscription ratio of 3:1. In this scenario, which two statements are correct? (Choose two.)

A. The oversubscription ratio decreases when you add leaf devices.

B. The oversubscription ratio remains the same when you remove leaf devices.

C. The oversubscription ratio increases when you remove leaf devices.

D. The oversubscription ratio remains the same when you add leaf devices.

Answer

C. The oversubscription ratio increases when you remove leaf devices.
D. The oversubscription ratio remains the same when you add leaf devices.

Understanding Oversubscription Ratio in IP Fabrics:

The oversubscription ratio in an IP fabric typically refers to the ratio of the available bandwidth at the edge of the network (leaves) to the available bandwidth at the core or spine. A 3:1 oversubscription ratio means that for every 3 units of bandwidth at the leaves, there is 1 unit of bandwidth at the spine.

Impact of Adding or Removing Leaf Devices:

Removing Leaf Devices:When you remove leaf devices, the amount of total edge bandwidth decreases while the bandwidth in the spine remains constant. This causes the oversubscription ratio toincreasebecause there is now less total bandwidth to distribute across the same amount of spine bandwidth.

Adding Leaf Devices:Conversely, when you add leaf devices, the total edge bandwidth increases. Since the spine bandwidth remains the same, the oversubscription ratio would remain the same if the additional leaves consume their share of the available bandwidth proportionally.

Conclusion:

Option C:Correct—Removing leaf devices increases the oversubscription ratio.

Option D:Correct—Adding leaf devices typically maintains the oversubscription ratio assuming uniform bandwidth distribution.

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Question # 2

You are preparing an sFlow monitoring system configuration. In this scenario, what Information will be included in the datagram sent to the sFlow collector? (Choose two.)

A. the interlace through which the packets entered the agent

B. the sending device's serial number

C. the CRC from the sampled packet

D. the source and destination VLAN for sampled packets

Answer

A. the interlace through which the packets entered the agent
D. the source and destination VLAN for sampled packets

Explanation:

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.

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Question # 3

You are asked to implement VXLAN group-based policies (GBPs) in your data center. Which two statements are correct in (his scenario? (Choose two.)

A. VXLAN GBP uses scalable group tags thatmust be configured statically on each switch and activated through 802.1X.

B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X.

C. VXLAN GBP ensures consistent application of security group policies throughout the network.

D. VXLAN GBP ensures consistent application of BGP groups throughout the network.

Answer

B. VXLAN GBP uses scalable group tags that may be configured on a RADIUS server and pushed to the switch through 802.1X.
C. VXLAN GBP ensures consistent application of security group policies throughout the network.

VXLAN Group-Based Policies (GBP):

VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management.

Scalable Group Tags via RADIUS and 802.1X:

Option B:VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity.

Consistent Security Policy Application:

Option C:GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device.

Conclusion:

Option B:Correct—Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management.

Option C:Correct—GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.

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Question # 4

Which two statements are correct about an IP fabric? (Choose two.)

A. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration

B. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.

C. Only a single point to point EBGP session is required between peers in an IP fabric.

D. FBGP is only required to route mostrouting information to external devices outside the fabric.

Answer

A. All leaf devices can use the same AS number in an IP fabric without making any adjustments to the EBGP configuration
B. The multipath multiple-as statement is required to enable ECMP if every device has a different AS number.

Explanation:

BGP in IP Fabric:

In an IP fabric, Border Gateway Protocol (BGP) is used to manage the routing between leaf and spine devices. Each device can have the same or different Autonomous System (AS) numbers depending on the network design.

Multipath Multiple-AS:

Option B:If every device in the fabric has a different AS number, then enabling Equal-Cost Multi-Path (ECMP) routing requires the multipath multiple-as statement. This configuration allows BGP to consider multiple paths across different AS numbers as equal cost, enabling efficient load balancing across the network.

Same AS Number Configuration:

Option A:It's possible for all leaf devices to use the same AS number in an IP fabric, which simplifies the configuration. EBGP (External BGP) will still function correctly in this setup because BGP considers the peering relationship rather than strictly enforcing different AS numbers in this specific use case.

Conclusion:

Option B:Correct—This statement is essential for enabling ECMP in a multi-AS environment.

Option A:Correct—Leaf devices can share the same AS number without needing special EBGP configuration.

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Question # 5

In your EVPN-VXAN environment, you want to prevent a multihomed server from receiving multiple copies ofBUM traffic in active/active scenarios. Which EVPN route type would satisfy this requirement?

A. Type 8

B. Type 7

C. Type 4

D. Type 5

Answer

C. Type 4

Explanation:

Understanding the Scenario:

In an EVPN-VXLAN environment, when using multi-homing in active/active scenarios, there's a risk that a multihomed server might receive duplicate copies of Broadcast, Unknown unicast, and Multicast (BUM) traffic. This is because multiple VTEPs might forward the same BUM traffic to the server.

EVPN Route Types:

Type 4 Route (Ethernet Segment Route):This route type is used to advertise the Ethernet Segment (ES) to which the device is connected. It is specifically used in multi-homing scenarios to signal the ES and its associated Ethernet Tag to all the remote VTEPs. The Type 4 route includes information that helps prevent BUM traffic duplication in active/active multi-homing by using a split-horizon mechanism, which ensures that traffic sent to a multihomed device does not get looped back.

Explanation:

The Type 4 route is crucial for ensuring that in a multi-homed setup, particularly in an active/active configuration, BUM traffic does not result in duplication at the server. The route helps coordinate which VTEP is responsible for forwarding the BUM traffic to the server, thereby preventing duplicate traffic.

Data Center References:

Type 4 routes are essential for managing multi-homing in EVPN to avoid the issues of BUM traffic duplication, which could otherwise lead to inefficiencies and potential network issues.

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