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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which OSPF router type connects an OSPF area to non-OSPF networks?

A. Internal Router
B. Autonomous System Boundary Router (ASBR)
C. Area Border Router (ABR)
D. Backbone Router

Answer: B

NEW QUESTION # 43
How does OSPF calculate the best path to a particular prefix?

A. It finds the path with the numerically lowest cost.
B. It finds the path with the least number of hops.
C. It finds the path with the shortest autonomous system path.
D. It finds the path with the numerically lowest route preference.

Answer: A

Explanation:
OSPF (Open Shortest Path First) calculates the best path based on the cost of the route, which is derived from the bandwidth of the interfaces along the path.
Step-by-Step Breakdown:
OSPF Path Selection:
OSPF assigns a cost to each link, typically based on the link's bandwidth (higher bandwidth equals lower cost).
The OSPF algorithm computes the shortest path to a destination by adding the costs of all links in the path. The path with the numerically lowest total cost is chosen as the best path. Cost Calculation:
The OSPF cost can be manually adjusted or automatically calculated using the default formula: Cost=Reference BandwidthLink Bandwidth ext{Cost} = rac{ ext{Reference Bandwidth}}{ ext{Link Bandwidth}}Cost=Link BandwidthReference Bandwidth Juniper Reference: OSPF Best Path Selection: OSPF selects the path with the lowest cumulative cost, ensuring efficient use of higher-bandwidth links in Junos networks.

NEW QUESTION # 44
Exhibit:

Referring to the exhibit, which statement is correct?

A. The configuration will commit successfully and BGP group 1 will operate as IBGP.
B. BGP group 1 requires a type internal parameter.
C. The configuration will commit successfully and BGP group 1 will operate as EBGP.
D. BGP group 1 requires a type external parameter.

Answer: C

Explanation:
In the exhibit, BGP is configured with local AS 65101 and a neighbor at 172.16.1.1 in peer AS 65201.
This setup involves two different Autonomous Systems (AS), indicating an External BGP (EBGP) configuration.
Step-by-Step Breakdown:
EBGP vs. IBGP:
EBGP is used between routers in different ASes. In this case, the local AS is 65101 and the peer AS is 65201, meaning the BGP session is EBGP.
IBGP is used between routers within the same AS, which is not applicable here as the AS numbers are different.
BGP Group Configuration:
The configuration does not require a type external parameter because Junos OS automatically recognizes the session as EBGP when the local and peer AS numbers are different. The BGP session will operate as EBGP, and the configuration will commit successfully.
Juniper
Reference: BGP Configuration: In Juniper, EBGP is automatically recognized when the local and peer AS numbers differ, without needing to specify type external.

NEW QUESTION # 45
What are the different OSPF area types? (Choose two)

A. Default-Free Zone
B. Not-So-Stubby Area (NSSA)
C. Virtual Link Area
D. Stub Area

Answer: B,D

NEW QUESTION # 46
Referring to the exhibit, why are the BGP routes hidden?

A. The BGP next hop is unreachable.
B. There are too many hops to the destination.
C. Other routes are selected because of better metrics.
D. Load balancing is not enabled.

Answer: A

Explanation:
In the exhibit, the BGP routes are marked as hidden. This typically happens when the routes are not considered valid for use, but they remain in the routing table for reference. One common reason for BGP routes being hidden is that the next hop for these routes is unreachable.
Step-by-Step Breakdown:
BGP Next Hop:
In BGP, when a route is received from a neighbor, the next hop is the IP address that must be reachable for the route to be used. If the next hop is unreachable (i.e., the router cannot find a path to the next-hop IP), the route is marked as hidden.
Analyzing the Exhibit:
The exhibit shows that the BGP next hop for all hidden routes is 10.4.4.4. If this IP is unreachable, the BGP routes from that neighbor will not be considered valid, even though they appear in the routing table.
Verification:
Use the command show route 10.4.4.4 to check if the next-hop IP is reachable.
If the next-hop is not reachable, the BGP routes will be hidden. Resolving the next-hop reachability issue (e.g., fixing an IGP route or an interface) will allow the BGP routes to become active.
Juniper Reference:
Junos Command: show route hidden displays routes that are not considered for forwarding.
Troubleshooting: Check the next hop reachability for hidden BGP routes using show route <next-hop>.

NEW QUESTION # 47
......

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