Exam CISSP topic 1 question 128 discussion

ISP is providing the underlay only. QoS is responsibility of the customer using the internet service.

Reliability is what you care about with VOIP.

It can not be b, because of the last words in the setence: "between apps". QoS between Apps!? Come on...

Only one application being provided, so it can't be B

The answer is B. QOS includes availability

It is the organization that provides the VoIP service, and it will be the one that must guarantee it. The ISP must guarantee the availability of the network and therefore this is the factor to be negotiated in the SLA.

they only have 1 application VoiceOverIP. There's no other applications to prioritize with QOS. If the network isn't available, there is no phone service since VOIP is completely dependent about the network.

SLA is what services are purchased and guranteed by the ISP and they are bound to it, they are different level of services package with various SLA and prices, if QOS is dropping below the SLA it is considered an outage.

organization solely provides Voice over Internet Protocol (VoIP) services, so only Voip traffic on the wire, do we need QoS than Availability?

The MOST important factor when negotiating an Internet Service Provider (ISP) service-level agreement (SLA) by an organization that solely provides Voice over Internet Protocol (VoIP) services would be: D. Availability of network services In a business where the sole service is VoIP, network availability is critical. If the network is down, the entire business operation could come to a halt, making availability a primary concern. VoIP is extremely sensitive to network downtime, and therefore, ensuring that the network is available is of utmost importance. While MTTR, QoS between applications, and financial penalties in case of disruption are also important factors to consider, they are secondary to ensuring that the network services are available for the core business offering of VoIP. This is aligned with best practices for SLAs in critical service delivery as per CISSP certification guidelines.

You usually see three or four or five 9s in an SLA but not QoS.

Option B, Quality of Service (QoS) between applications, is indeed an important consideration when negotiating an Internet service provider (ISP) service-level agreement (SLA) for an organization that provides Voice over Internet Protocol (VoIP) services. QoS refers to the ability to prioritize and allocate network resources to ensure the desired level of performance for specific applications or services. In the case of VoIP, maintaining a consistent and high-quality connection is crucial to ensure clear and uninterrupted voice communications. Negotiating a robust QoS provision in the SLA would help prioritize VoIP traffic and ensure optimal performance.

D, as your ISP is not responsible for your QoS: https://serverfault.com/questions/800826/is-quality-of-service-my-isps-responsibility I think QoS is thrown in there to trick you, because VOIP and QoS go together, but an ISP provides the internet service access, so they are about availability, not how your application works.

Internet do not honor QOS tagging, Best Effort only.... However, ISP can provide some sort of contract guaranteeing the availability of the internet circuit and services (SLA). SLA is not necessarily available in every parts of the world, not even US or EU, only based on available infrastructure.

The isp only provides voip, so qos and contention will be never be an issue. Availability equates to uptime and is most imp

B. Quality of Service (QoS) between applications is the most important when negotiating an Internet service provider (ISP) service-level agreement (SLA) by an organization that solely provides Voice over Internet Protocol (VoIP) services. QoS guarantees the availability of certain network resources, such as bandwidth, for specific types of traffic such as VoIP traffic, ensuring that voice calls are delivered with a minimum level of delay, jitter, and packet loss. This is critical for an organization that provides VoIP services, as poor QoS can result in poor call quality, dropped calls, and lost revenue. Source: openai

QOS and availability should be included in the SLA negotiation but the most important is QOS which should be more important.