4.1 Resilient, Scalable, and Secure Modular Network Design Based on Constraints (such as Technical, Operational, Application, and Business Constraints) to Support Applications on the IP Network (such as Voice, Video, Backups, Data Center Replication, IoT, and Storage) 400-007 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   What is the primary reason video applications require higher bandwidth than typical data applications?

   • AVideo applications must retransmit all lost packets
   • BVideo streams carry a large amount of data per second to represent moving images
   • CVideo applications use encryption that increases packet size
   • DVideo applications require multiple TCP connections per stream
   Reveal Solution Discussion Select an answer first
2. 22expert · hard

   A financial services firm is designing a new data center interconnect (DCI) to replicate a mission-critical database between two sites 50 km apart. The application team requires synchronous replication with a round-trip latency of no more than 2 ms. The business has a strict budget that prohibits leasing dark fiber, and the only available WAN transport is a carrier MPLS service with a committed information rate (CIR) of 1 Gbps. The network architect must recommend a design that meets the application requirement. What should the architect do?

   • ADeploy the synchronous replication over the MPLS service with QoS prioritization for the replication traffic.
   • BNegotiate with the carrier to place the MPLS endpoints at a meet-me point closer to the midpoint between the sites.
   • CRecommend that the business fund a dedicated wavelength or dark fiber to meet the latency requirement.
   • DChange the replication mode to asynchronous and accept the potential data loss window.
   Reveal Solution Discussion Select an answer first
4. 23foundation · easy

   Which of the following is an example of a technical constraint that must be considered in network design?

   • AThe number of network engineers available to operate the network
   • BThe maximum transmission unit (MTU) supported by the underlying transport
   • CThe organization's budget for network equipment
   • DThe requirement to comply with data protection regulations
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A hospital is deploying a new IP telephony system across three buildings. The voice traffic must be highly available, and the network team has limited experience with voice. The hospital's existing network uses a collapsed-core design with two distribution switches per building. Which design change is most important to support voice reliability?

   • AConfigure the two distribution switches in each building as a redundant pair with a first-hop redundancy protocol (FHRP) and use a dedicated voice VLAN.
   • BUse a single access switch per building to simplify the network and reduce the chance of misconfiguration.
   • CMove all voice traffic to the core layer to reduce the number of hops.
   • DAdd a third distribution switch in each building to provide additional redundancy.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A manufacturing company is deploying 5,000 IoT sensors across a campus to monitor environmental conditions. The sensors use MQTT over TLS and send a small telemetry message every 5 seconds. The operations team has limited staff and wants to minimize the number of network devices to manage. The security team requires that IoT devices be isolated from the corporate user network. Which modular design approach best meets these requirements?

   • AConnect all sensors directly to the core switches to reduce the number of access-layer devices.
   • BPlace all sensors on the existing user access VLAN and use ACLs to restrict traffic to the MQTT broker.
   • CUse a wireless mesh network for the sensors and connect the mesh root to the corporate network without segmentation.
   • DCreate a dedicated IoT access module with a separate VLAN and a local MQTT broker, and connect it to the distribution layer with a firewall.
   Reveal Solution Discussion Select an answer first