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| Section | Objectives |
|---|---|
| WAN and Edge Connectivity Design | - SD-WAN architecture and design considerations - Traditional WAN and internet edge design |
| Network Automation and Programmability | - Controller-based networking design - API-driven network automation concepts |
| Network Services Design | - Multicast and QoS design considerations - Routing protocols design (OSPF, EIGRP, BGP) |
| Enterprise Network Design Principles | - Design methodologies and best practices - Scalability and high availability design |
| Security Design in Enterprise Networks | - VPN and perimeter security architecture - Segmentation and access control design |
| Enterprise Campus Network Design | - Campus LAN architecture - Spine-leaf and hierarchical design models |
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24. Frage
A large company is building a new branch office, and the network architect already determined that the branch office will need a /24 network. The architect assigned a network engineer to design the rest of the addressing plan. The engineer's solution must support:
- at least five departments, each in a different subnet
- at least 25 hosts per subnet
- the use of private address space
Which subnet must the engineer assign to the first department?
Antwort: D
Begründung:
A /26 subnet provides 64 IP addresses, allowing for 62 usable host addresses, which meets the requirement of at least 25 hosts per department. Using 192.168.64.0/26 supports private addressing and allows multiple subnets to be allocated efficiently within the /24 network.
25. Frage
What is the main purpose of the Cisco SD-Access overlay design?
Antwort: C
Begründung:
The main purpose of the Cisco SD-Access overlay design is to enable the virtualized fabric services that run over the physical underlay. Cisco describes the overlay as the logical network created on top of the routed underlay, using virtual networks to provide segmentation and policy separation. SD-Access uses LISP for endpoint-to-location mapping and VXLAN for data-plane encapsulation, allowing Layer 2 and Layer 3 services to be delivered across a stable Layer 3 transport. Option C is the best available answer because the overlay exists to integrate and carry SD-Access services such as virtual networks, endpoint mobility, macrosegmentation, and security group policy. Simplified troubleshooting and visibility are management and assurance outcomes, not the overlay's main technical purpose. High availability depends on the underlay topology, node redundancy, and control-plane design, but it is not the primary definition of overlay design.
Reference topics: SD-Access overlay, virtual networks, LISP, VXLAN, segmentation, fabric services.
26. Frage
An architect is working on a design to connect a company ' s main site to several small to medium-sized remote branches. The solution must include redundant WAN links, but the customer has a limited budget and wants the ability to increase the link speed easily in the future. QoS will not on the branch routers so there is no need for consistent end-to-end QoS. Which solution does the architect propose?
Antwort: A
Begründung:
A dual-homed Internet design with a single edge router and site-to-site VPN topology best matches the stated cost and flexibility requirements. The customer needs redundant WAN links, has a limited budget, wants easy future bandwidth increases, and does not require consistent end-to-end QoS on the branch routers. Internet circuits are typically less expensive and easier to upgrade than MPLS access circuits, making them appropriate for small to medium-sized remote branches when strong QoS guarantees are not required. A single edge router also reduces hardware cost and operational complexity compared with dual edge routers.
WAN MPLS designs can provide stronger service-level guarantees and QoS treatment, but they are more expensive and less flexible for rapid bandwidth upgrades. A design with dual edge routers improves device redundancy but conflicts with the limited-budget condition. Therefore, a dual-homed Internet solution using a site-to-site VPN overlay is the most appropriate option. The architect should still validate encryption requirements, failover behavior, routing preference, and whether the Internet underlay can meet application performance expectations. Reference topics: branch WAN design, dual Internet connectivity, site-to-site VPN, cost-driven WAN selection.
27. Frage 
Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue?
(Choose two.)
Antwort: C,E
Begründung:
The selected command pair is appropriate because the issue is that GigabitEthernet0/2 on SW2 is not becoming the root port as expected. In spanning-tree design, the root port is selected based on the lowest root path cost, then upstream bridge ID, then port ID when necessary. If the wrong port is selected, the engineer must adjust the local spanning-tree parameters on SW2 so that the intended interface has the best path toward the root bridge. Typical corrective commands lower the spanning-tree cost or set the port priority on the desired interface or VLAN instance. The correct answer pair is therefore the combination that changes the STP decision variables for Gig0/2 rather than changing unrelated features such as PortFast, BPDU Guard, or VLAN trunking. PortFast is unsafe on switch-to-switch links, and protection features do not make an interface more attractive as a root port. The fix must influence STP path selection while keeping the topology loop-free.
Reference topics: STP root port election, path cost, port priority, root bridge path selection, Catalyst Layer 2 troubleshooting.
28. Frage
A company has many spoke sites with two data centers. The company wants to exchange the routing information between the data centers and the spoke sites using EIGRP. All locations belong to a single AS, and auto-summarization is disabled. Which two actions must the company choose? (Choose two.)
Antwort: A,B
29. Frage
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300-420 Originale Fragen: https://de.fast2test.com/300-420-premium-file.html
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