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Juniper JN0-280 Exam Sample Questions

Question # 1

What is the behavior of the default export policy for OSPF?

A. Accept all routes.

B. Reject all routes.

C. Redistribute all routes.

D. Forward all routes.

Answer

B. Reject all routes.

Explanation:

In Junos, thedefault export policyforOSPFis toreject all routesfrom being exported.

Step-by-Step Breakdown:

Default Export Policy:By default,OSPFin 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 customexport policythat 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.

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Question # 2

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

A. BGP peers advertise routes received from EBGP peers to other IBGP peers.

B. BGP peers advertise routes received from IBGP peers to other IBGP peers.

C. BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as thenext hop.

D. BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.

Answer

A. 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.

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 fromEBGP peerstoIBGP peerswithin the same AS. This ensures that routes learned from external networks are propagated internally within the AS.

IBGP to EBGP Route Propagation:

Routes learned fromIBGP peerscan be advertised toEBGP peers, but when advertising these routes, the router uses its own IP address as thenext 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.

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Question # 3

When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

A. The BFD default minimum interval is 3.

B. You can configure BFD per interface within the protocol stanza.

C. The BFD operation always consists of minimum intervals and multipliers.

D. The BFD default multiplier is 5.

Answer

B. You can configure BFD per interface within the protocol stanza.
C. The BFD operation always consists of minimum intervals and multipliers.

Explanation:

Bidirectional Forwarding Detection (BFD)is a protocol used to detect faults in the forwarding path between two routers. It provides rapid failure detection, enhancing the performance of routing protocols like OSPF, BGP, and IS-IS.

Step-by-Step Breakdown:

Per Interface Configuration:BFD can be configured on aper-interfacebasis within the protocol stanza (e.g., OSPF, BGP). This allows granular control over where BFD is enabled and the failure detection intervals for specific interfaces.

Minimum Interval and Multiplier:BFD uses aminimum interval(the time between BFD control packets) and amultiplier(the number of missed packets before the path is declared down). The combination of these two defines the detection time for failures.

Juniper Reference:

BFD Configuration: In Juniper, BFD is configurable within routing protocol stanzas, with the failure detection mechanism always based on minimum intervals and multipliers.

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Question # 4

A switch receives a frame with a MAC address of FF-FF-FF-FF-FF-FF. Which action will the switch take on this frame?

A. It will flood it out of all interfaces, except for the ingress interface.

B. It will flood it out of all interfaces, except for the directly connected VLAN.

C. It will flood it out of all interfaces, except for the next-hop interface.

D. It will flood it out of all interfaces.

Answer

A. It will flood it out of all interfaces, except for the ingress interface.

Explanation:

AMAC address of FF-FF-FF-FF-FF-FFis the Ethernetbroadcast address. When a switch receives a frame with this destination MAC address, it is required to forward the frame to all interfaces except the one it was received on.

Step-by-Step Breakdown:

Broadcast Frame Handling:When a frame with the broadcast MAC address is received, the switch will flood it out of all active ports that belong to the same VLAN as the incoming frame. The broadcast frame is not sent back out of the ingress interface (the interface where the frame was originally received).

Purpose of Flooding:Broadcasting is used to ensure that the frame reaches all devices within the broadcast domain (all devices within the same VLAN), which may not have a specific entry for the MAC address in their MAC address table.

Juniper Reference:

Layer 2 Frame Forwarding: Juniper switches flood broadcast frames to all ports in the same VLAN, except the port the frame was received on.

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Question # 5

Which two statements about IBGP are correct? (Choose two.)

A. By default, IBGP has a TTL of 1.

B. IBGP uses AS path for loop prevention.

C. By default, IBGP has a TTL of 255.

D. IBGP uses full mesh for loop prevention.

Answer

C. By default, IBGP has a TTL of 255.
D. IBGP uses full mesh for loop prevention.

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.

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