Download Free Juniper JN0-680 Exam Dumps VCE and PDF Collection from PassLeader (Question 21 – Question 25)

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Which three BGP messages pass EVPN information between devices? (Choose three.)

A.    open messages
B.    update messages
C.    notification messages
D.    keepalive messages
E.    route-refresh messages

Answer: ABE
A: BGP open messages contain information used to negotiate the establishment of sessions but do not contain route information itself. They may contain information such as I can exchange EVPN AFI/SAFI NLRI with you, but not EVPN information itself.
B: BGP update messages can contain EVPN NLRI information. This is the `routing information’ itself.
NOT C: BGP notification messages indicate error conditions and contain basic error codes but no routing information. Technically they could refer to an error relating to EVPN, however this is not a good fit for the question being asked.
NOT D: BGP keepalive messages are always 19 bytes and uniform; no NLRI information.
E: A BGP speaker can send a ROUTE-REFRESH message to request the receiver re-sends their previously-sent BGP updates which, as per C, can include EVPN NLRI information.

You created an IP Fabric based on iBGP. You noticed that ECMP load sharing is not working. In this scenario, what is the problem?

A.    Each member of the IP Fabric needs a different autonomous system number.
B.    BGP route reflectors only reflect the best route.
C.    ECMP load sharing is only supported on 40GbE and 100GbE interfaces.
D.    A route input policy needs to be added on all non-route reflectors to allow ECMP.

Answer: BD
NOT A: iBGP means by definition the same AS!
B: Because route-reflectors only advertise the best and active route, configuration changes are required to export multiple routes (where applicable); there are a few ways to do this: add path/multipath or multiple RRs or multiple sessions with different policies, etc.
NOT C: ECMP works on any IP path regardless of interface speed.
D: Route reflector clients must also support ECMP in their import policies and their forwarding policies.

You have an EBGP-based IP Fabric. Why do you need an export policy on each leaf in this scenario?

A.    to accept remote server-facing IP prefixes
B.    to ensure a full mesh is formed between peers
C.    to advertise local server-facing IP prefix
D.    to advertise local routes with the router reflector

Answer: AC
A: remote IP prefixes will not be known inside the local autonomous system unless learned via eBGP with remote peer.
NOT B: full mesh not required; would be required in iBGP without RR.
C: local IP prefix will not be known inside the peer autonomous system unless advertised.
NOT D: RR only used in iBGP.

You are configuring VXLAN on a network of QFX5100s, and are using the set vlans vlan100 vxlan command:
unreachable-vtep-aging-timer 600
What does this command do?

A.    This command ages out a remotely learned VTEP address after 600 seconds of inactivity.
B.    This command ages out the address of the remote VTEP 600 seconds after the last learned MAC address expires.
C.    This command ages out all learned MAC addresses assigned to the VTEP after 600 seconds of inactivity.
D.    This command ages out a locally learned MAC address assigned to the VTEP after 600 seconds of inactivity.

Answer: B
NOT A: this answer is ambiguous and vague about which MACs are involved.
B: this answer is most detailed and accurate.
NOT C – the aging timer refers to the remote VTEP MAC, not the MACs learned *via* that VTEP.
NOT D – the aging timer refers to the remote VTEP MAC after MACs learned *via* that VTEP age out; not locally-learned MACs.

What are two valid types of VXLAN signaling? (Choose two.)

A.    EVPN
B.    RSVP
C.    RSTP
D.    PIM

Answer: AB

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