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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q129-Q134):

NEW QUESTION # 129
What roles do the Designated Router (DR) and Backup Designated Router (BDR) play in OSPF?

A. They are responsible for generating LSAs for external routes.
B. They determine the shortest path first algorithm.
C. They redistribute routes between OSPF and non-OSPF networks.
D. They reduce the number of adjacencies on broadcast networks.

Answer: D

NEW QUESTION # 130
Which two statements about IBGP are correct? (Choose two.)

A. IBGP uses full mesh for loop prevention.
B. By default, IBGP has a TTL of 1.
C. IBGP uses AS path for loop prevention.
D. By default, IBGP has a TTL of 255.

Answer: A,D

Explanation:
IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System).
Step-by-Step Breakdown:
TTL of 255:
By default, IBGP sessions are established with a TTL (Time to Live) value of 255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional configuration.
Full Mesh Requirement:
IBGP requires a logical full mesh between 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 unless route reflectors or BGP confederations are used.
Juniper
Reference: IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full-mesh requirements.

NEW QUESTION # 131
What protocol and port does BGP use for control plane communication?

A. protocol UDP, port 179
B. protocol UDP, port 159
C. protocol TCP, port 179
D. protocol TCP, port 159

Answer: C

NEW QUESTION # 132
What is the default route preference for a static route on a Junos device?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 133
What is the behavior of the default export policy for OSPF?

A. Reject all routes.
B. Forward all routes.
C. Accept all routes.
D. Redistribute all routes.

Answer: A

Explanation:
In Junos, the default export policy for OSPF is to reject all routes from being exported.
Step-by-Step Breakdown:
Default Export Policy:
By default, OSPF in 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 custom export policy that 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 # 134
......

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