2017 Oct. New JN0-643 Exam Dumps with PDF and VCE Free Updated Today! Following are some JN0-643 Questions:
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QUESTION 71
You are asked to configure a CoS weighted tail drop profile on your EX Series switch that causes all traffic in the best effort queue to drop when the queue is 90 percent full.
Which configuration will accomplish this request?
A. [edit class-of-service]
drop-profiles {
be_dropp {
fill-level 90;
drop-probability 100;
}
}
B. [edit class-of-service]
drop-profiles {
be_dropp {
interpolate {
fill-level 90;
drop-probability 100;
}
}
}
C. [edit class-of-service]
drop-profiles {
be_dropp {
fill-level 90;
}
}
D. [edit class-of-service]
drop-profiles {
be_dropp {
fill-level 90;
drop-probability 90;
}
}
Answer: C
QUESTION 72
You must configure a multifield classifier on ge-1/0/0. This classifier must match only TCP traffic from port number 79, set the loss priority to high, and classify the traffic as expedited- forwarding. The inbound traffic has no previous CoS markings.
Which configuration meets these requirements?
A. [edit firewall]
user@switch# show filter ef_classifier_mf
term 1 {
from {
protocol tcp;
destination-port 79;
}
then {
loss-priority high;
forwarding-class expedited-forwarding;
}
[…]
}
B. [edit firewall]
user@switch# show filter ef_classifier_mf
term 1 {
from {
protocol tcp;
source-port 79;
}
then {
loss-priority high;
forwarding-class expedited-forwarding;
}
[…]
}
C. [edit firewall]
user@switch# show filter ef_classifier_mf
term 1 {
from {
protocol tcp;
destination-port 79;
}
then {
loss-priority low;
forwarding-class expedited-forwarding;
}
[…]
}
D. [edit firewall]
user@switch# show filter ef_classifier_mf
term 1 {
from {
protocol tcp;
source-port 79;
dscp ef;
}
then {
loss-priority high;
accept;
}
[…]
}
Answer: B
QUESTION 73
You are asked to reconfigure a CoS scheduler to limit the assured forwarding queue to a maximum of 75 percent of the available bandwidth. The assured forwarding queue uses a strict high priority queue.
Which configuration parameter accomplishes this task?
A. transmit-rate percent 75
B. buffer-size percent 75
C. shaping-rate percent 75
D. shared-buffer percent 75
Answer: C
QUESTION 74
You are asked to configure an interface policer. You must ensure when the bandwidth limit and burst size are exceeded, that the packet receives a CoS parameter which increases the probability that the packet will be dropped if the queues are congested.
Which policer action will accomplish this requirement?
A. dscp 0
B. loss-priority high
C. ip-precedence 0
D. loss-priority low
Answer: B
QUESTION 75
You must troubleshoot a CoS issue on an Ethernet interface which has been observed to drop packets in the best effort queue. You must determine whether the dropped packets are tail drops.
Which CLI command output accomplishes this task?
A. show class-of-service interface
B. show interfaces queue <interface_name>
C. show interfaces <interface_name> extensive
D. show class-of-service forwarding-class best-effort
Answer: B
QUESTION 76
What are two benefits of configuring OSPF database protection? (Choose two.)
A. Protects the LSDB from being flooded by excessive LSA flooding.
B. Provides intra-area route filtering and route summarization.
C. Allows the device to participate in OSPF routing but not be used for transit traffic.
D. Limits the number of LSAs in the LSDB (excluding those generated by the local router).
Answer: AD
QUESTION 77
Area 1 is configured as an NSSA with no summaries.
Which three types of LSAs are allowed in Area 1’s database? (Choose three.)
A. Type 1
B. Type 2
C. Type 3
D. Type 5
E. Type 7
Answer: ABE
QUESTION 78
Referring to the exhibit, and given that no other BGP manipulation has been configured, how is traffic influenced from R1 to R3?
A. Traffic is load-balanced across both paths.
B. Traffic is preferred through AS 2493.
C. Traffic is preferred through AS 8841.
D. Traffic prefers the path with the lowest local preference.
Answer: C
QUESTION 79
You are asked to establish a single EBGP peering across two physical interfaces to your ISP.
Which BGP feature should you use?
A. multipath
B. multihop
C. accept-remote-nexthop
D. allow
Answer: B
QUESTION 80
Referring to the exhibit, routers A, B, and C are in the same BGP AS 100. Router A prefers to route traffic through Router C.
Which BGP attribute would you configure to ensure this behavior?
A. as-path-prepend
B. local-preference
C. metric
D. weight
Answer: B
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