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Juniper Data Center, Associate (JNCIA-DC) Sample Questions (Q104-Q109):

NEW QUESTION # 104
Which two statements are correct about aggregate routes and generated routes? (Choose two.)

A. An aggregate route has a forwarding next hop.
B. A generated route does not have a forwarding next hop.
C. A generated route has a forwarding next hop.
D. An aggregate route does not have a forwarding next hop.

Answer: C,D

Explanation:
Aggregate routes and generated routes are used to create summarized routes in Junos, but they behave differently in terms of forwarding.
Step-by-Step Breakdown:
Aggregate Routes:
An aggregate route summarizes a set of more specific routes, but it does not have a direct forwarding next hop. Instead, it points to the more specific routes for actual packet forwarding.
Generated Routes:
A generated route also summarizes specific routes, but it has a forwarding next hop that is determined based on the availability of contributing routes. The generated route can be used to directly forward traffic.
Juniper Reference:
Aggregate and Generated Routes: In Junos, aggregate routes rely on more specific routes for forwarding, while generated routes can forward traffic directly based on their next-hop information.

NEW QUESTION # 105
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. By default, IBGP has a TTL of 255.
D. IBGP uses AS path for loop prevention.

Answer: A,C

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 # 106
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 Open message but not received one from the remote peer.
D. The local peer has sent an Update message but not received one from the remote peer.

Answer: A

Explanation:
The BGP session in the exhibit shows the state as Connect, which indicates that the TCP session between the BGP peers has not been fully established.
Step-by-Step Breakdown:
BGP State "Connect":
The Connect state is the second stage in the BGP finite state machine (FSM). At this stage, BGP is trying to establish a TCP session with 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 the OpenSent state, where the peers exchange BGP Open messages.
Possible Causes:
A firewall blocking TCP port 179.
Incorrect IP addresses or network connectivity issues between the BGP peers.
Juniper Reference:
BGP Troubleshooting: In Junos, if a BGP session is stuck in the Connect state, the issue is likely due to a failure in establishing the underlying TCP connection.

NEW QUESTION # 107
Which signaling protocol is used for EVPN?

A. IS-IS
B. PIM
C. OSPF
D. BGP

Answer: D

Explanation:
EVPN (Ethernet Virtual Private Network) is a standard protocol used for building Layer 2 and Layer 3 VPNs over an IP or MPLS network. The signaling protocol used for EVPN is BGP (Border Gateway Protocol).
Step-by-Step Breakdown:
BGP as the EVPN Signaling Protocol:
EVPN uses BGP to exchange MAC address reachability information between routers (PE devices). This enables devices to learn which MAC addresses are reachable through which PE devices, facilitating Layer 2 forwarding across an IP or MPLS core.
BGP Extensions for EVPN:
BGP is extended with new address families (e.g., EVPN NLRI) to carry both MAC and IP address information, allowing for scalable and efficient multi-tenant network solutions. Juniper Reference: Junos EVPN Configuration: Juniper uses BGP as the control plane for EVPN to exchange MAC and IP route information between different data center devices.

NEW QUESTION # 108
What is the default route preference of a static route in the Junos OS?

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

Answer: B

Explanation:
In Junos OS, the default route preference for a static route is 5. Route preference values are used to determine which route should be installed in the routing table when multiple routes to the same destination are available.
Step-by-Step Breakdown:
Static Route Preference:
A static route, by default, has a preference of 5, making it a highly preferred route. Lower preference values are more preferred in Junos, meaning static routes take precedence over most dynamic routing protocol routes, such as OSPF (preference 10) or BGP (preference 170).
Route Preference:
Route preference is a key factor in the Junos routing decision process. Routes with lower preference values are preferred and installed in the forwarding table.
Juniper Reference:
Static Routes: In Junos, the default preference for static routes is 5, making them more preferred than most dynamic routes.

NEW QUESTION # 109
......

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James Black James Black

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