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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q146-Q151):
NEW QUESTION # 146
Which of the following are functions of MACsec? (Choose two)
- A. It offers data integrity and confidentiality.
- B. It prevents MAC flooding attacks.
- C. It enables VLAN tagging.
- D. It provides Layer 2 encryption.
Answer: A,D
NEW QUESTION # 147
Which statement is correct about the OSPF link-state database?
- A. Each router within the same area must maintain a unique copy of the link-state database.
- B. Each router within the same area must maintain an identical copy of the link-state database.
- C. Each router within the OSPF domain must maintain a unique copy of the link-state database.
- D. Each router within the OSPF domain must maintain an identical copy of the link-state database.
Answer: B
NEW QUESTION # 148
Which two statements describe an IP fabric? (Choose two.)
- A. An IP fabric uses spine and leaf devices.
- B. An IP fabric depends on Layer 2 switching.
- C. An IP fabric allows devices to always be one hop away.
- D. An IP fabric provides traffic load sharing.
Answer: A,D
Explanation:
AnIP fabricis a network topology designed to provide a scalable, low-latency architecture that is typically implemented in modern data centers. It usesspine and leafswitches and enables efficienttraffic load sharing across the network.
Step-by-Step Breakdown:
* Spine-Leaf Architecture:
* Leaf Devices: These switches connect to servers and edge devices within the data center. Each leaf switch connects to every spine switch.
* Spine Devices: These high-performance switches interconnect all the leaf switches. There are no direct connections between leaf switches or spine switches. This architecture ensures that any two endpoints within the fabric are only one hop away from each other, minimizing latency.
* Traffic Load Sharing:
* An IP fabric leveragesEqual-Cost Multipath (ECMP)to distribute traffic evenly across all available paths between leaf and spine switches, providing effective load balancing. This ensures that no single link becomes a bottleneck and that traffic is distributed efficiently across the network.
Juniper Reference:
* Juniper providesQFX Seriesswitches optimized for IP fabric topologies, allowing for scalable deployments in modern data centers.
* EVPN-VXLAN: Often used in IP fabrics to extend Layer 2 services across the fabric with Layer 3 underlay, enabling both efficient routing and bridging.
NEW QUESTION # 149
Which two statements about IBGP are correct? (Choose two.)
- A. By default, IBGP has a TTL of 1.
- B. IBGP uses full mesh for loop prevention.
- C. IBGP uses AS path for loop prevention.
- D. By default, IBGP has a TTL of 255.
Answer: B,D
Explanation:
IBGP (Internal Border Gateway Protocol)is used to exchange routing information betweenrouters within the same AS (Autonomous System).
Step-by-Step Breakdown:
* TTL of 255:
* By default, IBGP sessions are established with aTTL (Time to Live)value of255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.
* Full Mesh Requirement:
* IBGP requires alogical full meshbetween all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unlessroute reflectorsorBGP confederationsare used.
Juniper Reference:
* IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full- mesh requirements.
NEW QUESTION # 150
Which of the following is a key benefit of implementing High Availability (HA) in a network?
- A. Slower data recovery
- B. Reduced network security
- C. Increased network downtime
- D. Enhanced data redundancy
Answer: D
NEW QUESTION # 151
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