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| Section | Objectives |
|---|---|
| Network Services Design | - Routing protocols design (OSPF, EIGRP, BGP) - Multicast and QoS design considerations |
| WAN and Edge Connectivity Design | - SD-WAN architecture and design considerations - Traditional WAN and internet edge design |
| Security Design in Enterprise Networks | - Segmentation and access control design - VPN and perimeter security architecture |
| Enterprise Campus Network Design | - Campus LAN architecture - Spine-leaf and hierarchical design models |
| Enterprise Network Design Principles | - Scalability and high availability design - Design methodologies and best practices |
| Network Automation and Programmability | - Controller-based networking design - API-driven network automation concepts |
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NEW QUESTION # 439
An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?
Answer: D
Explanation:
The best allocation is to give each branch adjacent /24 prefixes from the 10.0.0.0/8 private range, using one
/24 for data and the next contiguous /24 for voice. Each /24 provides 254 usable host addresses, which satisfies the requirement for up to 128 hosts. More importantly, pairing two contiguous /24s creates a clean
/23 summary per branch. For example, 10.0.0.0/24 for data and 10.0.1.0/24 for voice summarize as 10.0.0.0
/23; the next branch can use 10.0.2.0/24 and 10.0.3.0/24 summarized as 10.0.2.0/23. This pattern supports aggregation and keeps the security team's identification simple because voice prefixes can consistently use the odd-numbered third octet. Option C uses /25 prefixes, but /25 provides only 126 usable addresses, which fails a strict requirement for up to 128 hosts if the subnet and broadcast addresses are excluded. Separate
172.16 ranges reduce per-site summarization clarity. Reference topics: RFC 1918 addressing, VLSM, route summarization, branch addressing design, data and voice prefix allocation.
NEW QUESTION # 440
When provisioning bandwidth for an IP telephony network, which elements are unique to an IP telephony call?
(Choose two.)
Answer: B,C
Explanation:
Bandwidth provisioning for an IP telephony call consists of the voice stream traffic and the call control traffic.
These elements are unique to an IP telephony call.
The network infrastructure should be examined to see if the required bandwidth exists to support the voice and call-control applications. The sum of the bandwidth necessary for each major application, including voice, video, and data, should not exceed 75% of the total available bandwidth for each link. Voice traffic can be characterized as:
Smooth
Benign
Drop sensitive
Delay sensitive
Voice packets are typically around 60 to 120 bytes in size. For good voice quality, packet loss should be less than 1 percent and delay should be no more than 150 ms.
The IP telephony voice call-control procedures also generate traffic. The call control procedures are in the areas of call setup, maintenance, redirect, and tear down. There are special protocols such as H.323 and Media Gateway Control Protocol (MGCP) that handle these procedures.
Voice applications are delay-sensitive. Speech is sampled by voice processors referred to as a codec (coder/ decoder). Then the digitized voice-sample outputs of the codecs are sent into the network towards the receiver at regular intervals in real-time transport protocol (RTP) packets. If these packets containing the voice samples are delayed for any reason behind other data traffic, the quality of the voice conversation suffers.
The transportation of these voice applications in RTP packets through the IP network handled by H.323 protocols and devices is referred to as Voice over IP (or VoIP for short).
The following are other network and design considerations besides bandwidth relating to IP telephony infrastructure support:
Determine if the cabling plant can support the IP telephony equipment.
Determine if the switch hardware can supply power to attached IP telephony equipment or if additional hardware is required.
Ensure that infrastructure supports priority end-to-end VLANs and QoS networking.
Internet Group Management Protocol (IGMP) is used for managing the membership of IP multicast groups and is not an element unique to an IP telephony call.
Routing protocol packets (RIP, OSPF, and EIGRP) are used by routers to share routing information, and are not elements unique to an IP telephony call.
The speed of the segment to the telephone is important to VoIP, but that is not an element unique to an IP telephony call.
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify VLANs
References:
Cisco > Support > Technology Support > Voice > Telephony Signaling
NEW QUESTION # 441
Refer to the exhibit.
An engineer is designing a routing solution for a customer. The design must ensure that a failure of network
10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence time during any link failover in the core or access networks. Which solution must the engineer select?
Answer: D
NEW QUESTION # 442
Refer to the exhibit. Customers report low video quality and delays when having point-to-point telepresence video calls between the two locations. An architect must optimize a design so that traffic follows the same path for egress and ingress traffic flows. Which technique optimizes the design?
Answer: B
Explanation:
IS-IS Level1 Router allways take the route towards the closest L2 Router, when trying to reach a destination outside the AS. That is the reason why the return-traffic takes a different way here.
The problem occurs because Level1 and Level2 topologies are examied separatly by the respective routers. The solution is to hand down Level2 routing-information about the destination networks into Layer1 routing, so it can be included into path selection.
NEW QUESTION # 443
When a network is designed using IS-IS protocol, which two circuit types are supported? (Choose two.)
Answer: A,C
Explanation:
Section: Advanced Addressing and Routing Solutions
NEW QUESTION # 444
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