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100% Pass Quiz 2021 Accurate 4A0-220: Nokia GMPLS-Controlled Optical Networks New Exam Pattern - Errandsolutions


Exam Code: 4A0-220

Exam Name: Nokia GMPLS-Controlled Optical Networks

Version: V22.75

Q & A: 580 Questions and Answers

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+classification and markind: ACLs
+congestion avoidance: WRED
+traffic conditioners: CAR
+congestion management: LLQ
+link efficiency: LFI
Classication is the process of partitioning traffic into multiple priority levels or classes of service. Information in the frame or packet header is inspected, and the frame's priority is determined.Marking is the process of changing the priority or class of service (CoS) setting within a frame or packet to indicate its classication. Classication is usually performed with access control lists (ACL), QoS class maps, or route maps, using various match criteria.
Congestion-avoidance techniques monitor network trafc loads so that congestion can be anticipated and avoided before it becomes problematic. Congestion-avoidance techniques allow packets from streams identied as being eligible for early discard (those with lower priority) to be dropped when the queue is getting full. Congestion avoidance techniques provide preferential treatment for high priority trafc under congestion situations while maximizing network throughput and capacity utilization and minimizing packet loss and delay.
Weighted random early detection (WRED) is the Cisco implementation of the random early detection (RED) mechanism. WRED extends RED by using the IP Precedence bits in the IP packet header to determine which traffic should be dropped; the drop-selection process is weighted by the IP precedence.
Traffic conditioner consists of policing and shaping. Policing either discards the packet or modies some aspect of it, such as its IP Precedence or CoS bits, when the policing agent determines that the packet meets a given criterion. In comparison, traffic shaping attempts to adjust the transmission rate of packets that match a certain criterion. Shaper typically delays excess trafc by using a buffer or queuing mechanism to hold packets and shape the ow when the source's data rate is higher than expected. For example, generic traffic shaping uses a weighted fair queue to delay packets to shape the ow. Traffic conditioner is also referred to as Committed Access Rate (CAR).
Congestion management includes two separate processes: queuing, which separates traffic into various queues or buffers, and scheduling, which decides from which queue trafc is to be sent next. There are two types of queues: the hardware queue (also called the transmit queue or TxQ) and software queues. Software queues schedule packets into the hardware queue based on the QoS requirements and include the following types: weighted fair queuing (WFQ), priority queuing (PQ), custom queuing (CQ), class-based WFQ (CBWFQ), and low latency queuing (LLQ).
LLQ is also known as Priority Queuing-Class-Based Weighted Fair Queuing (PQ-CBWFQ). LLQ provides a single priority but it's preferred for VoIP networks because it can also congure guaranteed bandwidth for different classes of traffic queue. For example, all voice call traffic would be assigned to the priority queue, VoIP signaling and video would be assigned to a traffic class, FTP traffic would be assigned to a low-priority traffic class, and all other traffic would be assigned to a regular class.
Link efficiency techniques, including link fragmentation and interleaving (LFI) and compression. LFI prevents small voice packets from being queued behind large data packets, which could lead to unacceptable delays on low-speed links. With LFI, the voice gateway fragments large packets into smaller equal-sized frames and interleaves them with small voice packets so that a voice packet does not have to wait until the entire large data packet is sent. LFI reduces and ensures a more predictable voice delay.
(Reference: Cisco Press Designing for Cisco Internetwork Solutions)

What is the purpose of the guest VLAN on a Cisco Catalyst switch?
A. It provides configurable guest access to devices that have a supplicant when the authentication server is down or unreachable.
B. It provides configurable guest access to non-supplicant devices that lack local credentials.
C. It provides configurable guest access to non-supplicant devices that have local credentials.
D. It provides configurable guest access to devices that have a supplicant when the authenticator is down or unreachable.
E. It provides configurable guest access to devices that have a supplicant but lack local credentials.
Answer: B

A problem occurs on an activity with free float and the project manager has extended its duration. What is MOST likely to be affected?
A. The latest start for the successor activity
B. Project scope management plan
C. Project duration
D. Resource schedules
Answer: D

A new intern in the purchasing department requires read access to shared documents. Permissions are normally controlled through a group called "Purchasing", however, the purchasing group permissions allow write access.
Which of the following would be the BEST course of action?
A. Remove all permissions for the shared files.
B. Create a new group that has only read permissions for the files.
C. Modify all the shared files with read only permissions for the intern.
D. Add the intern to the "Purchasing" group.
Answer: B

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