4A0-107 Online Practice Questions and Answers

Which of the following are the minimum requirements needed to classify traffic marked with DSCP AF11, AF12, and AF13 into the AF forwarding class and provide fair treatment to the drop precedence settings? (Choose three)

A. Profile mode queues

B. Priority mode queues

C. 1 queue

D. 3 queues

E. 3 forwarding classes

F. 1 forwarding class, with 2 subclasses

G. 1 forwarding class, with 3 subclasses

Which of the following are trusted boundaries, by default? (Choose two)

A. An IES SAP

B. A VPLS SAP

C. A network port

D. AVPRN SAP

E. An access port

Which of the following statements are TRUE? (Choose two)

A. The primary contributors to latency are distance, scheduling, and congestion.

B. The weighted round robin scheduling algorithm will result in more delay for high priority traffic than the regular round robin algorithm.

C. The round robin scheduling algorithm will result in less jitter for low priority traffic than a strict priority scheduler.

D. Packet loss can be reduced by decreasing the amount of buffer space available to a queue.

E. Latency can be reduced by increasing the amount of buffer space available to a queue.

A queue is configured with the following attributes:

MBS = 10KB CBS = 5KB High-Priority-Only = 30%

Assume that there is no CBS overbooking and that the slope-policy is disabled. If the current queue depth is 8KB, what will happen to an in-profile packet arriving in the queue?

A. It will be discarded because the high-priority-only threshold is exceeded.

B. It will be queued but re-marked as "out-of-profile."

C. It will be queued in the reserved portion of the buffer pool and remain "in-profile."

D. It will be queued in the shared portion of the buffer pool but contend for shared buffer space with packets from other queues.

E. It will be queued in the shared portion of the buffer pool but may be dropped if the buffer utilization exceeds the start-average value of the low slope.

Click the exhibit button below.

All interfaces are using their default trust states and MPLS is used as the transport tunnel. The SAP-ingress, SAP-egress, and network QoS policies have been configured as shown below. Assume that the default network-queue policy is used on each router.

At router PE 1, customer traffic is arriving marked with DSCP BE and tagged with a dot1p value of 3.

Based on the configuration shown below for the VPRN service, what will be the DSCP and dot1p marking for the packet egressing at router PE 2? (Choose two)

A. The DSCP value will be set to af21.

B. The DSCP value will be set to be.

C. TheDSCPvaluewillbesettoaf23.

D. The DSCP value will be set to af 12.

E. Thedot1pvaluewillbesetto5.

F. Thedot1pvaluewillbesetto2.

G. The dot1p value will be set to 3.

Which of the following statements describe the operation of WRED on the Nokia 7750 SR? (Choose three)

A. WRED monitors the shared buffer space utilization over a period of time.

B. WRED disables the TCP slow-start congestion control mechanism.

C. WRED uses two configurable slopes for each buffer pool: a high slope and a low slope.

D. WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.

E. WRED polices the shared buffer pool and marks all packets above a certain rate as "discard eligible."

On the Nokia 7750 SR, what is the maximum number of queues that a single SAP-ingress policy can support in a VPLS?

A. 16

B. 8

C. 32

D. 48

E. 56

The network QoS policy shown below is applied properly to a Nokia 7750 SR acting as a transit Label Switch Router (LSR) for a given MPLS tunnel. A packet is received inside the MPLS tunnel with EXP=4, dot1p=4, and DSCP=AF. Which forwarding class is assigned to this packet?

A. L2

B. H1

C. AF

D. BE

Which of the following statements is a characteristic of a CFHP arbiter?

A. An arbiter can adjust the CIR of its child policers.

B. An arbiter rate-limits the collective output of several policers towards each egress FFPC.

C. An arbiter can adjust the bandwidth assigned to its child arbiters and child policers.

D. An arbiter does not need to honor the configurations of its child policers.

How many bits in the IP ToS field define the packet's precedence?

A. 3

B. 4

C. 6

D. 8