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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q40-Q45):

NEW QUESTION # 40
Which two statements are correct about using LACP on a Junos device? (Choose two.)

A. LACP is used to monitor the status of an aggregated Ethernet bundle's member interfaces on a Junos device.
B. LACP is used to automatically add and delete interfaces from aggregated Ethernet bundles on a Junos device.
C. Both sides of the LACP session must be in active mode to exchange LACP packets on a Junos device.
D. One side of the LACP session must be in active mode to exchange LACP packets on a Junos device.

Answer: A,D

NEW QUESTION # 41
Exhibit:

R2 received an OSPF update from R1, and it received the same update from R3.
Referring to the exhibit, what will R2 do?

A. R2 acknowledges R3 and discards it.
B. R2 ignores the update from R3.
C. R2 ignores the update from R1.
D. R2 does nothing with R3's update.

Answer: B

Explanation:
In the exhibit, R2 receives the same OSPF update from both R1 and R3. OSPF has mechanisms to prevent unnecessary processing of duplicate LSAs (Link-State Advertisements).
Step-by-Step Breakdown:
OSPF LSA Processing:
OSPF uses LSAs to exchange link-state information between routers. When a router receives an LSA, it checks if it already has a copy of the LSA in its Link-State Database (LSDB).
Duplicate LSAs:
If R2 has already received and processed the update from R1, it will ignore the update from R3 because it already has the same LSA in its database. OSPF uses the concept of flooding, but it does not reprocess LSAs that it already knows about.
R2 Behavior:
R2 will keep the update from R1 (the first one it received) and will ignore the same LSA from R3, as it is already in the LSDB.
Juniper
Reference: OSPF LSA Processing: Junos adheres to OSPF standards, ensuring that duplicate LSAs are not processed multiple times to avoid unnecessary recalculations.

NEW QUESTION # 42
By default, which two statements are correct about BGP advertisements? (Choose two.)

A. BGP peers advertise routes received from IBGP peers to other IBGP peers.
B. BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as the next hop.
C. BGP peers advertise routes received from EBGP peers to other IBGP peers.
D. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.

Answer: C,D

Explanation:
BGP (Border Gateway Protocol) has specific rules for route advertisement between peers.
Step-by-Step Breakdown:
EBGP to IBGP Route Propagation:
BGP peers advertise routes learned from EBGP peers to IBGP peers within the same AS. This ensures that routes learned from external networks are propagated internally within the AS. IBGP to EBGP Route Propagation:
Routes learned from IBGP peers can be advertised to EBGP peers, but when advertising these routes, the router uses its own IP address as the next hop.
IBGP Split Horizon:
By default, IBGP peers do not advertise routes learned from one IBGP peer to another IBGP peer.
This rule (IBGP split horizon) prevents routing loops within an AS.
Juniper
Reference: BGP Advertisement Rules: Junos adheres to BGP standards, where IBGP peers do not propagate routes to other IBGP peers, but EBGP peers receive IBGP routes with the advertising router as the next hop.

NEW QUESTION # 43
Layer 2 interfaces operate in which two modes? (Choose two.)

A. Modular
B. Access
C. Tagged
D. Trunk

Answer: B,D

Explanation:
Comprehensive Detailed Step by Step Explanation with all Juniper Data Center References Layer 2 interfaces on a switch operate in two key modes: Access and Trunk.
Step-by-Step Breakdown:
Access Mode:
Access ports are used to connect end devices, like PCs or servers, and they are assigned to a single VLAN. These interfaces handle untagged traffic and do not pass VLAN tags.
Example: A port assigned to VLAN 10 will only handle traffic for that VLAN.
Trunk Mode:
Trunk ports are used to connect switches or other networking devices that need to handle traffic from multiple VLANs. Trunk interfaces carry tagged traffic, allowing multiple VLANs to traverse the same physical link.
Trunk ports typically use 802.1Q VLAN tagging to differentiate between VLANs.
Juniper Reference:
Access and Trunk Ports: Juniper switches use these modes to manage VLAN traffic at Layer 2, with access ports handling untagged traffic and trunk ports handling tagged traffic from multiple VLANs.

NEW QUESTION # 44
Which two statements are correct about EVPN-VXLAN overlay networking? (Choose two.)

A. OSPF provides the control plane within the overlay network.
B. It is the only option to provide reachability between servers that reside in the same network segment in a data center.
C. An encapsulation of the original packet is required to transport the packet across the network.
D. BGP provides the control plane within the overlay network.

Answer: C,D

Explanation:
EVPN-VXLAN is an overlay technology used in data center networks to extend Layer 2 services over a Layer 3 network.
Step-by-Step Breakdown:
BGP Control Plane:
BGP (Border Gateway Protocol) is used as the control plane for EVPN-VXLAN. BGP advertises MAC addresses and IP address reachability information across the VXLAN network, enabling efficient multi-tenant Layer 2 connectivity over a Layer 3 infrastructure.
Encapsulation:
VXLAN (Virtual Extensible LAN) encapsulates Layer 2 frames into Layer 3 packets. This encapsulation allows Layer 2 traffic to be transported across a Layer 3 network, effectively creating a tunnel for Ethernet frames.
Juniper Reference:
EVPN-VXLAN Configuration: Juniper supports EVPN-VXLAN with BGP as the control plane, allowing scalable Layer 2 connectivity over a routed infrastructure in modern data centers.

NEW QUESTION # 45
......

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