4A0-107 Online Practice Questions and Answers

What is the 6-bit binary representation of DSCP value AF21?

A. 010011

B. 100010

C. 010001

D. 001100

E. 010010

Click the exhibit button below. A partial SAP-ingress policy configuration is shown below. A UDP video stream is sent to a PC with IP address 192.168.1.100. Given the SAP-ingress policy, to which forwarding class is the traffic matched?

A. AF

B. EF

C. H2

D. H1

E. BE

In the context of hierarchical scheduling, a scheduler is configured with a CIR weight of 0. Which of the following statements is TRUE?

A. The scheduler will be allocated its "within CIR" bandwidth before all other children at the same level have received their "within CIR" bandwidth.

B. The scheduler will be allocated its "within CIR" bandwidth after all other children at the same level have received their "within CIR" bandwidth.

C. The scheduler will be allocated its "within CIR" bandwidth after all other children at all levels have received their "within CIR" bandwidth.

D. The scheduler will not be allocated its "within CIR" bandwidth.

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.

Click the exhibit button below. A network operator has configured a network-queue policy to map forwarding classes to queues, as shown in the exhibit below. Based on the default scheduling behavior of the Nokia 7750 SR, in which order will packets be serviced?

A. All in-profile packets in round-robin, then all out-of-profile packets in biased round-robin.

B. In-profile EF packets, then in-profile H2 packets, then in-profile AF packets, then out-of-profile EF packets, then out-of-profile H2 and AF packets, and then out-of-profile BE packets.

C. In-profile EF, H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

D. In-profile EF packets, then in-profile H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

E. In-profile EF and H2 packets, then in-profile AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

Which of the following statements about buffer admission control techniques is FALSE?

A. A packet is accepted into a queue based on its priority and forwarding class.

B. Buffer admission control limits the number of out-of-profile packets that enter the queue.

C. Both high priority-only buffer space and WRED can be used in a queue.

D. Priority is used when a packet enters a SAP-ingress queue.

Which of the following statements about a queue's rate parameters is FALSE?

A. If CIR = PIR, then all packets will be considered as in-profile.

B. CIR can be set to 0.

C. CIR can be larger than PIR.

D. CIR can be set to `max'.

While deciding how to share the available bandwidth among its children, when does a port scheduler consider the parameter "level" of a child?

A. During the allocation of within-CIR bandwidth.

B. During the allocation of above-CIR bandwidth.

C. During the allocation of both within-CIR and above-CIR bandwidth.

D. The port scheduler does not use the level of a child for making bandwidth allocation decisions

Assume all transmitted frames on a SONET port are 1500 bytes and that the average frame overhead has been configured as 10%. If the total bandwidth of all queues, excluding overhead, needs to be guaranteed at 55 Mbps, how much bandwidth should be configured for the egress port scheduler applied on that port?

A. 55 Mbps / 1.1 = 50 Mbps

B. 55 Mbps

C. 55 Mbps + 55 Mbps * 0.1 / 1.1 = 60 Mbps

D. 55 Mbps * 1.1 = 60.5 Mbps

In the diagram shown above, applying policing and soft-policing on access ingress is typical for which of the following types of traffic?

A. Real-time

B. Assured

C. Best-effort

D. Self-generated