Exam CISSP topic 1 question 369 discussion

gpt: In VoIP deployments, ensuring low latency, minimal packet loss, and consistent network performance are crucial for maintaining call quality and reliability. Deterministic routing can offer advantages in VoIP environments by providing predictable paths for VoIP traffic, which can help optimize network performance and minimize latency. However, deterministic routing may not always be the best choice for VoIP, especially in large or dynamic networks where traffic patterns can change rapidly. In such environments, dynamic routing protocols like OSPF (Open Shortest Path First) or BGP (Border Gateway Protocol) may be more suitable, as they can adapt to network changes and route traffic dynamically based on real-time conditions.

D. Deterministic Routing A. Boundary routing: Boundary routing refers to the routing of traffic between different networks or domains. While it is important for overall network connectivity, it may not directly address the specific requirements of VoIP traffic. B. Classless Inter-Domain Routing (CIDR): CIDR is a technique used to allocate and assign IP addresses more efficiently. While CIDR can help manage IP addresses effectively, it does not directly relate to the assurance of the network for VoIP applications. C. Internet Protocol (IP) routing lookups: IP routing lookups involve searching for the appropriate path to forward data packets based on their destination IP addresses. While IP routing lookups are a fundamental part of network routing, they are not specifically focused on addressing the unique challenges of VoIP traffic over a WAN.

Of the two options provided, when introducing Voice over Internet Protocol (VoIP) to a Wide Area Network (WAN) network, Quality of Service (QoS) mechanisms, which include IP routing lookups, become more essential for assurance than deterministic routing. Here's why: Quality of Service (QoS) Mechanisms (Including IP Routing Lookups): QoS mechanisms, including IP routing lookups, are crucial for ensuring that VoIP traffic receives priority treatment over other types of traffic in the network. IP routing lookups play a fundamental role in determining the path that VoIP packets will take through the network, ensuring they reach their destination efficiently. QoS mechanisms allow routers to classify, mark, and prioritize VoIP traffic based on its requirements, ensuring low latency, minimal jitter, and reduced packet loss for VoIP calls. By implementing QoS mechanisms, such as traffic prioritization, traffic shaping, and packet queuing, network administrators can optimize the WAN infrastructure to support the specific needs of VoIP traffic, thus enhancing the overall quality and reliability of voice calls.

answer C: Internet Protocol routing lookup as it provides QOS which is essential to provide the Quality of Service required for VOIP. Deterministic routing is robust but does not provide QOS features.

D. Deterministic routing Deterministic routing helps maintain consistent latency and predictable traffic paths, which are crucial for real-time applications like VoIP.

D. Deterministic routing.

D. Deterministic routing becomes even more essential to the assurance of the network when the WAN is supporting converged applications like Voice over Internet Protocol (VoIP) because it ensures that the packets are delivered to the correct destinations in a timely and reliable manner. Deterministic routing uses specific routing tables and protocols that guarantee a certain level of predictability in the routing process, which is crucial for real-time applications like VoIP that require low latency and jitter.

I'm going with D also, SD-WAN enables the appliance to determine the best/optimal path based on the traffic type and its sensitivity (i.e., VoIP traffic can deterministically be routed via the optimal WAN circuit based on lowest packet-loss, latency and delay).

I am going with "D" on this one. It looks like C is part of D. In deterministic routing, the path is fully determined by the source and destination nodes. Intermediate nodes are unable to direct messages even in the case of network congestion. Deterministic routing can be further classified according to the node position where the deterministic path is selected. In source routing, it is the source node that selects the complete path between the source and destination nodes. Distributed routing gives each intermediate node the freedom to independently determine the next node of the path to which the message should be sent. https://www.tutorialspoint.com/what-is-deterministic-routing

I think D is better answer. Relates directly to VOIP https://en.wikipedia.org/wiki/Deterministic_routing