P.S. KaoGuTi在Google Drive上分享了免費的2026 Cisco 300-420考試題庫：https://drive.google.com/open?id=1yFbpTwC7d1YaTCnUNJRRZzM9sdFkM6_C
KaoGuTi的300-420考古題和實際的認證考試一樣，不僅包含了實際考試中的所有問題，而且考古題的軟體版完全類比了真實考試的氛圍。使用了KaoGuTi的考古題，你在參加考試時完全可以應付自如，輕鬆地獲得高分。
| Section | Objectives |
|---|---|
| Topic 1: Network Automation and Programmability | - API-driven network automation concepts - Controller-based networking design |
| Topic 2: Enterprise Campus Network Design | - Spine-leaf and hierarchical design models - Campus LAN architecture |
| Topic 3: Network Services Design | - Routing protocols design (OSPF, EIGRP, BGP) - Multicast and QoS design considerations |
| Topic 4: Security Design in Enterprise Networks | - VPN and perimeter security architecture - Segmentation and access control design |
| Topic 5: Enterprise Network Design Principles | - Scalability and high availability design - Design methodologies and best practices |
| Topic 6: WAN and Edge Connectivity Design | - Traditional WAN and internet edge design - SD-WAN architecture and design considerations |
面對競爭激勵的世界，唯有考取和別人不一樣的證照，才可以充實自己，知識就是力量。購買 Cisco 300-420 題庫，可以免費享受一年的更新題庫的售后服務，在購買前享有免費試用部分考題DEMO。我們提供PDF和軟體格式的考題，其中PDF版本可以列印，軟體版的題庫可以模擬真實的 Cisco 的 300-420 考試。正確率100%，考生可以參照最新的 300-420 認證部分考題。
問題 #261 
Refer to the exhibit. An engineer is planning an IPv4 to IPv6 migration solution for a customer. The routers in the network can support IPv4 and IPv6, except for the DWDM routers. The DWDM routers provide a Layer 2 link in which the routers peer directly with each other across a DWDM circuit. The circuit also provides connectivity between the mail servers. Which IPv6 migration technique must the engineer deploy?
答案：D
問題 #262 
Refer to the exhibit. The connection between SW2 and SW3 is fiber and occasionally experiences unidirectional link failure. An architect must optimize the network to reduce the change of layer2 forwarding loops when the link fails. Which solution should the architect include?
答案：D
解題說明：
Loop guard should be used on SW2 to reduce the chance of Layer 2 forwarding loops caused by a unidirectional fiber failure. In spanning-tree operation, a root or alternate port expects to receive BPDUs from the designated bridge. If BPDUs stop arriving because the fiber becomes unidirectional, the port may incorrectly assume that the path is no longer receiving a superior BPDU and transition toward forwarding.
Cisco loop guard prevents this by moving the port into a loop-inconsistent state when BPDUs are unexpectedly lost on a non-designated port. That behavior protects the topology from a port role change that could create a Layer 2 loop. BPDU filter is dangerous in this context because it can suppress BPDUs and hide the control-plane signal STP needs. BPDU guard is mainly for PortFast edge ports that should never receive BPDUs. Root guard prevents superior BPDUs from changing root placement, but it does not address unidirectional loss of expected BPDUs. Therefore, loop guard on SW2 is the proper design control. Reference topics: STP loop guard, unidirectional fiber failure, BPDU loss, loop-inconsistent state, Layer 2 resiliency.
問題 #263
Drag and drop the elements from the left onto the functions they perform in the Cisco SD-WAN architecture on the right.
答案：
解題說明：
Explanation
Table Description automatically generated
問題 #264
How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?
答案：A
解題說明：
問題 #265
An engineer is upgrading a company's main site to include a connection to a second ISP. The company will receive full Internet routing tables from both ISPs via BGP. The engineer must ensure that the company does not become a transit autonomous system. Which solution should be included in this design?
答案：A
解題說明：
Section: WAN for Enterprise Networks
問題 #266
......
你在擔心如何通過可怕的Cisco的300-420考試嗎？不用擔心，有KaoGuTi Cisco的300-420考試培訓資料在手，任何IT考試認證都變得很輕鬆自如。我們KaoGuTi Cisco的300-420考試培訓資料是Cisco的300-420考試認證準備的先鋒。
300-420考題: https://www.kaoguti.com/300-420_exam-pdf.html
從Google Drive中免費下載最新的KaoGuTi 300-420 PDF版考試題庫：https://drive.google.com/open?id=1yFbpTwC7d1YaTCnUNJRRZzM9sdFkM6_C