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CISSP Exam - Question 369


If the wide area network (WAN) is supporting converged applications like Voice over Internet Protocol (VoIP), which of the following becomes even MORE essential to the assurance of the network?

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Correct Answer: D

When supporting converged applications like VoIP on a WAN, deterministic routing becomes essential because it ensures that the packets are delivered to their destinations in a timely and reliable manner. VoIP requires low latency and minimal jitter to maintain call quality. Deterministic routing uses specific routing tables and protocols that guarantee predictable and efficient path selection, which is crucial for the performance of real-time applications such as VoIP.

Discussion

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HongjunOption: C
Oct 6, 2024

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.

Humongous1593Option: D
Apr 13, 2023

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

maawar83
Jul 3, 2024

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.

franbarproOption: D
Apr 26, 2023

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

[Removed]
Apr 27, 2023

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).

DJOEKOption: D
Jul 12, 2023

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.

Woo7Option: C
Aug 7, 2024

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.

Hongjun
Sep 29, 2024

agreed with u

Dee83
Jul 31, 2023

D. Deterministic routing.

jackdryan
Nov 14, 2023

D is correct

Soleandheel
Jun 16, 2024

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

Hongjun
Sep 29, 2024

no.voip never ask for realtime.

GuardianAngel
Aug 8, 2024

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.

BigITGuyOption: D
Apr 2, 2025

When a WAN is supporting converged applications like Voice over IP (VoIP), which are highly sensitive to latency, jitter, and packet loss, it becomes essential to have deterministic routing. Not C. Internet Protocol (IP) routing lookups -- Routine part of packet forwarding, but improving lookups alone does not guarantee deterministic or optimized paths for VoIP.