Test 300-420 Collection & 300-420 Sample Questions Pdf

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Cisco 300-420 Exam Syllabus Topics:

Section	Weight	Objectives
Enterprise Campus Security	20%	- Design network security - Design network access control
WAN for Enterprise Networks	20%	- Design WAN connectivity - Design SD-WAN solution - Design QoS for WAN
Services	10%	- Design end-to-end QoS policy - Design network management
Advanced Enterprise Campus Networks	25%	- Design campus network services (QoS, multicast, etc.) - Design for high availability - Design Layer 2 and Layer 3 campus networks
Advanced Addressing and Routing Solutions	25%	- Determine IPv6 migration strategy - Create structured addressing designs - Create stable, secure, and scalable routing designs for Layer 3

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q426-Q431):

NEW QUESTION # 426
Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

A. Cipher Block Chaining (CBC)
B. Electronic Code Book (ECB)
C. Galois/Counter Mode (GCM)
D. Cipher Feedback (CFB)

Answer: C

NEW QUESTION # 427

Refer to the exhibit. An architect is designing an ISIS solution with these requirements:
* The backbone area will grow to 50 routers in the next 12 months.
* Routers A1 and A2 must avoid suboptimal routing.
* Summarization and route-leaking should be allowed in areas 49.002 and 49.003.
Which solution must the architect select?

A. area 49.000 L1, area 49.001 L2, area 49.002 L2, and area 49.003 L2
B. area 49.000 L1, area 49.001 L1, area 49.002 L2, and area 49.003 L2
C. area 49.000 L2. area 49.001 L2, area 49.002 L1, and area 49.003 L1
D. area 49.000 L2. area 49.001 L1, area 49.002 L1, and area 49.003 L1

Answer: D

Explanation:
The correct IS-IS hierarchy places area 49.000 as Level 2 and areas 49.001, 49.002, and 49.003 as Level 1. In IS-IS, Level 2 forms the interarea backbone, while Level 1 areas contain local topology details. This design supports growth in the backbone because Level 2 routers exchange interarea reachability without carrying every local topology change from every access area. Areas 49.002 and 49.003 can perform summarization and route leaking at their Level 1/Level 2 boundaries, allowing routers such as A1 and A2 to avoid suboptimal routing by learning selected more-specific routes from the backbone when necessary. If the nonbackbone areas were made Level 2, the design would flatten the hierarchy and expose more of the network to topology changes. If the backbone were Level 1, interarea routing would be broken or badly constrained. The selected hierarchy preserves scaling, allows route control, and avoids unnecessary propagation of local link flaps.
Reference topics: IS-IS hierarchy, Level 1 areas, Level 2 backbone, route leaking, summarization, scaling.

NEW QUESTION # 428
Refer to the exhibit. An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:
- Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.
- The service provider will create a client-facing IPv6 interface with
a new IPv6 virtual address that points to the same IPv4 DNS server.
- The service provider will support clients that use global IPv6
addresses and encapsulate IPv4 packets into IPv6 tunnels.
Which two migration solutions must the architect choose? (Choose two.)

A. Use dual-stack lite from the devices to the core MPLS network.
B. Use NAT44/64 from the MPLS network to the IGR.
C. Use dual-stack lite from the MPLS network to the IGR.
D. Use NAT44/64 from the devices to the core MPLS network.
E. Use IPv6 tunneling from the devices to the core MPLS network.

Answer: A,B

NEW QUESTION # 429
A customer reports that each time a networking component fails, OSPF recalculates the backup path, with causes a short outage. Which solution must the customer implement to improve this situation?

A. Aggressive OSPF timers
B. BFD
C. Incremental SPF
D. LFA FRR

Answer: C

Explanation:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-incre-spf.pdf

NEW QUESTION # 430
Refer to the exhibit. A customer requires a Layer 2 network designed to support:
- 500 active logical ports
- trunking of 30 VLANs
- convergence of less than 1 second
Which Spanning Tree Protocol must be selected?

A. CST
B. RPVST+
C. MSTP
D. PVST+

Answer: B

NEW QUESTION # 431
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