This exam assesses knowledge related to network performance, QoS, and congestion management in Cisco networks, vital for network engineers.
Delay
Jitter
Link speed
Packet routing
Packet addressing
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The router will only drop non delay-sensitive data that is close to the end of the queue
The router will drop any packet that arrives at the end of the queue.
The router will remove the most recent data placed in the queue to make space for an arriving packet.
The router will remove the packet in the front of the queue, move all other packets forward, and insert the just arrived packet at the end.
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Dropped voice packets are not retransmitted.
Voice traffic requires at least 384 kbs of bandwidth.
Voice traffic consumes lots of network resources.
Voice traffic is unpredictable and inconsistent.
Voice traffic latency should not exceed 150 ms.
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To control the maximum number of packets allowed in a single queue
To control the maximum number of packets allowed to be discarded
To control the maximum number of packets that can be forwarded each second on an egress interface
to control the maximum number of packets that can be received each second on an ingress interface
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FIFO
WFQ
CBWFQ
LLQ
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FIFO
WFQ
FCFS
CBWFQ
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FIFO
CBWFQ
WFQ
LLQ
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FIFO
WFQ
CBWFQ
LLQ
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the easiest QoS model to deploy
groups all TCP flows into a single class
Delivers end to end QoS
uses the Resource Reservation Protocol (RSVP) to signal QoS requirements
can divide network traffic into classes based on business requirements
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It does not provide a delivery guarantee for packets.
It uses a connection-oriented approach with QoS.
It treats all network packets in the same way.
It allows end hosts to signal their QoS needs to the network.
It provides preferential treatment for voice packets.
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Network devices ensure that resources are available before traffic is allowed to be sent by a host through the network.
Network devices provide a best-effort approach to forwarding traffic.
Network devices are configured to service multiple classes of traffic and handle traffic as it may arrive.
Network devices use QoS on a hop-by-hop basis to provide excellent scalability.
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DiffServ
best-effort
IntServ
soft QoS
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Voice traffic
web traffic
file transfers
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Prevent bursts of traffic.
Drop lower-priority packets.
Decrease buffer space.
Disable queuing mechanisms.
Increase link capacity.
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Class of Service
Traffic Class
Type of Service
Priority
VLAN ID
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Layer 3 marking can carry QoS information on switches that are not IP aware.
Layer 3 marking can be used to carry non-IP traffic.
Layer 3 marking can carry the QoS information end-to-end.
Layer 3 marking can be carried in the 802.1Q fields.
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traffic policing
weighted random early detection
best-effort
first-in, first-out
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Traffic policing
Classification and marking
Weighted random early detection
Traffic shaping
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IntServ
best-effort
DiffServ
FIFO
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Classifying
Marking
Queuing
Shaping
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