Juniper JN0-661 Exam Practice Questions (P. 5)
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Question #21
Which two actions will accomplish this task? (Choose two.)
- APlace both interfaces in a link aggregation group.
- BConfigure different VLANs on each interface.
- CConfigure all VLANs on both interfaces, on the PE, and on the CE.
- DConfigure Spanning Tree Protocol between the PE and the CE.
BD
D: To prevent the formation of Layer 2 loops between the CE devices and the multihomed PE routers, Juniper recommends that you employ the Spanning Tree
Protocol (STP) on your CE devices. Layer 2 loops can form due to incorrect configuration. Temporary Layer 2 loops can also form during convergence after a change in the network topology.
References:
http://www.juniper.net/documentation/en_US/junos16.1/topics/topic-map/vpls-bgp-multihoming.html

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Question #22
R1 is exporting 2000:FEFE:100::/64 to R2 over the EBGP peering session as shown in the exhibit.


What will R1 use for this route's protocol next hop when advertising it to R2?
- A2000:FEFE:89::1
- B172.16.1.1
- C10.1.1.1
- D::FFFF:172.16.1.1
B
When a BGP router reports itself as the next hop, whether because of an explicit neighbor next-hop-self configuration or implicitly as a result of participating in an
EBGP session, BGP allocates a new in label and adds an entry to the MPLS forwarding table, creating a label-to-next-hop mapping.
Note: When a BGP router does not report itself as the next hop, whether because of an explicit neighbor next-hop-unchanged configuration or implicitly as a result of a participating in an IBGP session, BGP does not allocate a new in label. Instead, if the route is advertised as a labeled route, BGP uses the existing out label.
This feature is used mainly on route reflectors.
References:
https://www.juniper.net/techpubs/en_US/junose16.1/topics/concept/mbgp-bgp-next-hop-self-overview.html

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Question #23
In this scenario, which two statements are true? (Choose two.)
- AAn Ethernet segment appears as a LAG to the CE device.
- BA backup designated forwarder is elected for forwarding BUM traffic to the CE device.
- CThe Ethernet segment identifier must be an all zeros identifier.
- DA designated forwarder is elected for forwarding BUM traffic to the CE device.
A
A: When a CE device is multihomed to two or more PE routers, the set of Ethernet links constitutes an Ethernet segment. An Ethernet segment appears as a link aggregation group (LAG) to the CE device .
B: When a CE device is multihomed to two or more PE routers, either one or all of the multihomed PE routers are used to reach the customer site depending on the multihoming mode of operation. The PE router that assumes the primary role for forwarding BUM traffic to the CE device is called the designated forwarder
(DF).
Incorrect Answers:
C: An Ethernet segment must have a unique nonzero identifier, called the Ethernet segment identifier (ESI). The ESI is encoded as a 10 octet integer.
References:
http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/evpn-bgp-multihoming-overview.html

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Question #24
- AThe selected path for a given LSP is passed to the TED in the form of an ERO.
- BLSPs with lower numerical setup priorities are computed before LSPs with higher setup priority values.
- CThe selected path for a given LSP is passed to RSVP in the form of an ERO.
- DLSPs with higher numerical setup priorities are computed before LSPs with lower setup priority values.
BC
The CSPF algorithm first calculates the highest-priority LSP (the one with the lowest setup priority value).
Do I need to enable CSPF to control where to send my traffic? The answer is no. You can manually configure an Explicit Route Objects (ERO) list, and let RSVP doing the job. In the presence of the ERO object, the RSVP Path messages will follow the path specified, thus the Resv messages carrying the labels in the opposite direction.
References:
https://www.netflask.net/jnpr-constrained-shortest-path-first/

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Question #25
Which action would solve this problem?
- AAssign a policer on ingress to assign a low packet loss priority to the strict-high queue.
- BDecrease the buffer size of the strict-high queue.
- CAssign a policer on egress to assign a low packet loss priority to the strict-high queue.
- DIncrease the buffer size of the strict-high queue.
D
A queue with strict-high priority is assured unlimited transmission bandwidth but is not actually assigned a large delay buffer. Not configuring a transmit-rate or an explicit buffer-size on a strict-high priority queue only ensures that the queue gets assigned a default minimum delay buffer, making it possible, under bursty conditions, to see tail-drops on strict-high priority queues. Assigning a small transmit-rate or an explicit temporal or percentage buffer-size to the queue ensures that the queue has a large enough buffer to hold bursts and protect against tail-drops.
References:
http://www.juniper.net/documentation/en_US/junos15.1/topics/usage-guidelines/cos-configuring-schedulers-for-priority-scheduling.html

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