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NEW QUESTION # 41
What is a common issue to check for when troubleshooting a LAG not forming correctly?
- A. Mismatched VLAN configurations
- B. Overutilization of CPU resources
- C. Excessive broadcast traffic
- D. Identical IP addresses on all LAG interfaces
Answer: A
NEW QUESTION # 42
A routing policy has been created to advertise OSPF routes in BGP. Which statement is correct in this scenario?
- A. Apply the policy as an import policy within BGP.
- B. Apply the policy as an export policy within OSPF.
- C. Apply the policy as an import policy within OSPF.
- D. Apply the policy as an export policy within BGP.
Answer: D
Explanation:
When advertisingOSPF routesintoBGP, the appropriaterouting policyshould be applied as anexport policy in BGP.
Step-by-Step Breakdown:
* OSPF to BGP Route Advertisement:Routes learned via OSPF (a dynamic IGP) need to be exported into BGP to be advertised to external BGP peers. In Junos OS, this is done usingexport policies.
* Export Policies in BGP:An export policy controls which routes are advertised out of a BGP session. In this scenario, the routing policy must be applied toBGP as an export policyto export the OSPF-learned routes to external BGP peers.
* Policy Configuration:Example configuration:
set policy-options policy-statement EXPORT_OSPF term 1 from protocol ospf set policy-options policy-statement EXPORT_OSPF term 1 then accept set protocols bgp group <group-name> export EXPORT_OSPF This policy ensures that only OSPF routes are exported into BGP.
Juniper Reference:
* Routing Policy: Export policies are used in BGP to control route advertisements to peers, including those learned via OSPF.
NEW QUESTION # 43
Which operation mode command will display the mapping between the VLAN ID and ports on a switch?
- A. show interfaces terse
- B. show route
- C. show vlans
- D. show ethernet-switching table
Answer: C
Explanation:
To display themapping between VLAN IDs and portson a Juniper switch, the show vlans command is used.
Step-by-Step Breakdown:
* VLAN Information:The show vlans command displays detailed information about VLAN configurations, including the VLAN ID, associated interfaces (ports), and VLAN membership.
* Command Example:
show vlans
* This command will provide an output listing each VLAN, its ID, and the interfacesassociated with the VLAN, enabling network engineers to quickly verify VLAN to port mappings.
Juniper Reference:
* VLAN Verification: Use the show vlans command to verify which VLANs are configured on the switch and the ports that are members of those VLANs.
NEW QUESTION # 44
When a MAC limiting violation occurs, the switch performs which two actions by default? (Choose two.)
- A. It causes Layer 2 loops.
- B. The port is disabled.
- C. It drops the packet.
- D. No logging takes place.
Answer: B,C
Explanation:
When aMAC limiting violationoccurs on a Juniper switch, the switch will perform the following actions by default:
Step-by-Step Breakdown:
* Port Disabled:When the number of MAC addresses on an interface exceeds the configured limit, the port isautomatically disabledto prevent further violations. This is a protective mechanism to prevent MAC address flooding.
* Packet Dropped:Additionally, packets from the violating MAC address aredroppedto prevent any further communication from that address. This ensures that only valid MAC addresses are allowed to communicate through the interface.
* Example Configuration:
set ethernet-switching-options secure-access-port interface <interface-name> mac-limit 5
* If more than five MAC addresses are learned, the port is disabled, and excess packets are dropped.
Juniper Reference:
* MAC Limiting: When the switch detects a MAC limiting violation, it disables the port and drops further packets from the violating MAC addresses to maintain network security.
NEW QUESTION # 45
Leaf and spine data centers are used to better accommodate which type of traffic?
- A. north-east
- B. south-east
- C. east-west
- D. north-west
Answer: C
Explanation:
In modern data centers, the shift toward leaf-spine architectures is driven by the need to handle increased east- west traffic, which is traffic between servers within the same data center. Unlike traditional hierarchical data center designs, where most traffic was "north-south" (between users and servers), modern applications often involve server-to-server communication (east-west) to enable services like distributed databases, microservices, and virtualized workloads.
Leaf-Spine Architecture:
* Leaf Layer: This layer consists of switches that connect directly to servers or end-host devices. These switches serve as the access layer.
* Spine Layer: The spine layer comprises high-performance switches that provide interconnectivity between leaf switches. Each leaf switch connects to every spine switch, creating a non-blocking fabric that optimizes traffic flow within the data center.
East-West Traffic Accommodation:
In traditional three-tier architectures (core, aggregation, access), traffic had to traverse multiple layers, leading to bottlenecks when servers communicated with each other. Leaf-spine architectures address this by creating multiple equal-cost paths between leaf switches and the spine. Since each leaf switch connects directly to every spine switch, the architecture facilitates quick, low-latency communication between servers, which is essential for east-west traffic flows.
Juniper's Role:Juniper Networks provides a range of solutions that optimize for east-west traffic in a leaf- spine architecture, notably through:
* QFX Series Switches: Juniper's QFX series switches are designed for the leaf and spine architecture, delivering high throughput, low latency, and scalability to accommodate the traffic demands of modern data centers.
* EVPN-VXLAN: Juniper uses EVPN-VXLAN to create a scalable Layer 2 and Layer 3 overlay network across the data center. This overlay helps enhance east-west traffic performance by enabling network segmentation and workload mobility across the entire fabric.
Key Features That Support East-West Traffic:
* Equal-Cost Multipath (ECMP): ECMP enables the use of multiple paths between leaf and spine switches, balancing the traffic and preventing any one path from becoming a bottleneck. This is crucial in handling the high volume of east-west traffic.
* Low Latency: Spine switches are typically high-performance devices that minimize the delay between leaf switches, which improves the efficiency of server-to-server communications.
* Scalability: As the demand for east-west traffic grows, adding more leaf and spine switches is straightforward, maintaining consistent performance without redesigning the entire network.
In summary, the leaf-spine architecture is primarily designed to handle the increase ineast-west trafficwithin data centers, and Juniper provides robust solutions to enable this architecture through its switch platforms and software solutions like EVPN-VXLAN.
NEW QUESTION # 46
Which of the following BGP attributes is considered first in the route selection process?
- A. Origin
- B. Local Preference
- C. MED
- D. AS Path Length
Answer: B
NEW QUESTION # 47
What is the behavior of the default export policy for OSPF?
- A. Forward all routes.
- B. Redistribute all routes.
- C. Reject all routes.
- D. Accept all routes.
Answer: C
Explanation:
In Junos, thedefault export policyforOSPFis toreject all routesfrom being exported.
Step-by-Step Breakdown:
* Default Export Policy:By default,OSPFin Junos does not export any routes to other routing protocols or neighbors. This is a safety mechanism to prevent unintended route advertisements.
* Custom Export Policies:
* If you need to export routes, you must create a customexport policythat explicitly defines which routes to advertise.
* Example: You can create an export policy to redistribute static or connected routes into OSPF.
Juniper Reference:
* OSPF Export Behavior: In Juniper devices, the default policy for OSPF is to reject route advertisements unless explicitly configured otherwise through custom policies.
NEW QUESTION # 48
Which Junos operational mode command is used to troubleshoot issues with VLANs?
- A. show interfaces
- B. show vlans
- C. show ethernet-switching table
- D. monitor traffic
Answer: C
NEW QUESTION # 49
You have configured a load balancing policy.
Which statement is correct about applying the policy?
- A. The policy is applied as an import policy under the routing protocol s hierarchy.
- B. The policy is applied as an export policy under routing-options forwarding table.
- C. The policy is applied as an import policy under routing-options forwarding table.
- D. The policy is applied as an export policy under the routing protocol s hierarchy.
Answer: B
NEW QUESTION # 50
When configuring High Availability components, which of the following practices are recommended? (Choose two)
- A. Regularly update firmware to non-recommended versions.
- B. Use a single path for data and control traffic.
- C. Implement regular testing of failover mechanisms.
- D. Ensure physical redundancy of critical components.
Answer: C,D
NEW QUESTION # 51
Which static routing parameter will silently drop the packet if it is set as the next hop?
- A. Discard
- B. Reject
- C. Readvertise
- D. Resolve
Answer: A
Explanation:
When thediscardoption is configured as the next hop for a static route, it silently drops any packets that match the route without sending any notification to the sender.
Step-by-Step Breakdown:
* Discard Behavior:
* If a route uses thediscardnext hop, the router drops the packet without generating any ICMP message or error back to the sender. This is useful for creating null routes to prevent routing loops or blackhole traffic intentionally.
* Reject vs. Discard:
* Therejectnext hop, in contrast, drops the packet but sends anICMP Destination Unreachable message back to the source.
Juniper Reference:
* Static Route Behavior: In Junos, thediscardoption ensures packets matching a static route are dropped silently, providing a way to discard traffic without alerting the source.
NEW QUESTION # 52
In a Virtual Chassis configuration, which of the following is true?
- A. Only two switches can be connected in a Virtual Chassis setup.
- B. It allows physical stacking of switches that are geographically dispersed.
- C. It reduces the operational complexity of managing multiple switches.
- D. It decreases network redundancy and reliability.
Answer: C
NEW QUESTION # 53
Generated routes in a network are mainly used to:
- A. Reduce the overall size of the routing table.
- B. Summarize external routes into the network.
- C. Automatically create a route when a specified condition is met.
- D. Manually configure specific network routes.
Answer: C
NEW QUESTION # 54
You are troubleshooting a downed BGP session.
Referring to the exhibit, what is the cause of the problem?
- A. The TCP session between the peers has not been established.
- B. The UDP session between the peers has not been established.
- C. The local peer has sent an Update message but not received one from the remote peer.
- D. The local peer has sent an Open message but not received one from the remote peer.
Answer: A
Explanation:
The BGP session in the exhibit shows the state asConnect, which indicates that theTCP sessionbetween the BGP peers has not been fully established.
Step-by-Step Breakdown:
* BGP State "Connect":
* TheConnectstate is the second stage in the BGP finite state machine (FSM). At this stage, BGP is trying to establish aTCP sessionwith the peer, but the session has not yet been successfully established.
* A successful TCP three-way handshake (SYN, SYN-ACK, ACK) is required before BGP can progress to theOpenSentstate, where the peers exchange BGP Open messages.
* Possible Causes:
* A firewall blocking TCP port179.
* Incorrect IP addresses or network connectivity issues between the BGP peers.
Juniper Reference:
* BGP Troubleshooting: In Junos, if a BGP session is stuck in theConnectstate, the issue is likely due to a failure in establishing the underlying TCP connection.
NEW QUESTION # 55
How does VLAN tagging benefit network segmentation?
- A. By enabling the identification and separation of traffic belonging to different VLANs.
- B. By encrypting data traffic between VLANs.
- C. By providing a backup path for data in case of link failure.
- D. By ensuring the same IP address range can be used in different VLANs.
Answer: A
NEW QUESTION # 56
When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)
- A. The BFD default minimum interval is 3.
- B. The BFD operation always consists of minimum intervals and multipliers.
- C. The BFD default multiplier is 5.
- D. You can configure BFD per interface within the protocol stanza.
Answer: B,D
NEW QUESTION # 57
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