How to Pass the Nokia 4A0-107 Exam: Comprehensive Nokia Quality of Service Guide and Tips

Signal degradation, attenuation, line loss

Latency, FIFO, WRED

Delay, jitter, packet loss

SNR, queue depth, latency

Attenuation, dispersion, latency

level

cir-level

weight

cir-weight

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

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

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

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

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

It sets both the forwarding class and the packet’s dot1p, lsp-exp, precedence, or dscp field to the same value.

It groups all packets together into a single aggregate stream, and gives all packets the same treatment.

It copies the three most significant bits in the packet’s dscp field into the forwarding class.

It assigns a forwarding class based on the packet’s dot1p, lsp-exp, precedence, or dscp value.

Queue parameters with which the queue will compete for bandwidth.

The level of hierarchy with which a group of schedulers is associated.

Bandwidth controls that limit each child scheduler or child queues associated with the scheduler.

The maximum bandwidth that the parent scheduler can offer its child queues or schedulers.

Closest

Average

Min

Max

Change the CIR-level value for the best-effort queue to 8.

Do not change anything; it is already guaranteed to receive its CIR

Change the CIR-level value for the best-effort queue to 1.

Change the CIR-weight value of the AF queue to 0.

Policing, expedited

Metering, marked discard eligible

Marking, marked discard eligible

Policing, discarded

Shaping, discarded

All buffer space is initially allocated to access pools, and some of it is reallocated to network pools if network interfaces are configured on it.

All buffer space is initially allocated to network pools, and some of it is reallocated to access pools if service SAPs are configured on it.

Buffer space is allocated 50% for access pools and 50% for network pools.

Buffer space is allocated 25% for access pools and 75% for network pools.

Packets marked with dscp = af33

Packets marked with dot1p = 4

All packets mapped to queue 2 have the same priority to enter this queue.

There are no packets mapped to queue 2.