300-420 Exam Quizzes - 300-420 Valid Braindumps Files

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Cisco 300-420 Exam Syllabus Topics:

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

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q455-Q460):

NEW QUESTION # 455
Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN?

A. multicast-replicator
B. multicast RP
C. IGMPv2
D. multicast service routes

Answer: C

NEW QUESTION # 456
A network administrator is troubleshooting a DMVPN setup between the hub and the spoke. Which action should the administrator take before troubleshooting the IPsec configuration?

A. Verify the GRE tunnels.
B. Verify crypto maps.
C. Verify NHRP.
D. Verify ISAKMP.

Answer: A

Explanation:
Before troubleshooting IPsec in a DMVPN deployment, the administrator should verify the GRE tunnel operation. DMVPN is built from multipoint GRE, NHRP, routing, and usually IPsec encryption. IPsec protects the tunnel traffic, but the logical tunnel and overlay reachability must be valid first. If the tunnel interface is down, incorrectly addressed, or unable to carry GRE traffic, troubleshooting crypto maps or ISAKMP will waste time because encryption cannot fix a broken overlay. After the GRE tunnel state is validated, the administrator can confirm NHRP registration and resolution, routing adjacencies, and then IPsec security associations. ISAKMP and crypto map troubleshooting are relevant only after basic tunnel operation is known to be correct. NHRP is also critical in DMVPN, but the question asks what to do before troubleshooting IPsec configuration; the first prerequisite is to verify that the GRE tunnel itself is functioning.
This layered troubleshooting order follows Cisco operational practice: confirm transport reachability, then tunnel interface behavior, then NHRP and routing, and finally cryptographic protection.

NEW QUESTION # 457
A network engineer must segregate three interconnected campus networks using IS-IS routing. A two-layer hierarchy must be used to support large routing domains and to avoid more specific routes from each campus network being advertised to other campus network routers automatically. Which two actions does the engineer take to accomplish this segregation? (Choose two.)

A. Designate two IS-IS routers as BDR routers at the edge of each campus, and configure one BDR for all Level 1 routers and one BDR for all Level 2 routers.
B. Assign the same IS-IS NET value for each campus, and configure internal campus routers with Level 1/ Level 2 routing.
C. Utilize different MTU values for each campus network segment. Level 2 backbone routers must utilize a larger MTU size of 9216.
D. Designate two IS-IS routers from each campus to act as Level 1/Level 2 backbone routers at the edge of each campus network.
E. Assign a unique IS-IS NET value for each campus, and configure internal campus routers with Level 1 routing.

Answer: D,E

Explanation:
Section: Advanced Enterprise Campus Networks

NEW QUESTION # 458
A customer plans to deploy WoL in the enterprise with these high-level design requirements:
- DHCP services must be available
- Clients BIOS settings must be set for WoL
- Clients get IP addresses once online
- Spanning-tree PortFast is enabled on the Layer 2 switches
Which two solutions must the customer select to have a successful deployment? (Choose two.)

A. IP helper-addresses for the WoL server must be enabled on the SVI or routed interface where the client subnets reside
B. IP directed broadcast and forward-protocol must be enabled on all the SVI or routed interfaces where the client subnets reside
C. IP directed broadcast and forward-protocol must be disabled on all the SVI or routed interfaces where the client subnets reside
D. IP helper-addresses for the client ranges must be disabled on the SVI or routed interface where the WoL server subnet resides
E. IP helper-addresses for the client ranges must be enabled on the SVI or routed interface where the WoL server subnet resides

Answer: A,B

NEW QUESTION # 459
An engineer must design a scalable QoS architecture that allows the separation of the traffic into classes on predefined business requirements. The design must also utilize the differentiated services code points as the QoS priority descriptor value and support at least 10 levels of classification. Which QoS technology should the engineer include in the design?

A. RSVP
B. Interserv
C. Diffserv
D. Best effort

Answer: C

Explanation:
DiffServ is the correct scalable QoS architecture for classifying traffic according to business requirements and using DSCP values as the priority descriptor. Cisco QoS design distinguishes DiffServ from IntServ. IntServ uses per-flow signaling with RSVP and can reserve resources, but that model is not operationally scalable across large enterprise networks. DiffServ is class-based. Traffic is classified and marked at the network edge, then each device applies per-hop behavior to those classes using local QoS policy. DSCP provides a six-bit field in the IP header, which supports more than ten classification values and allows standardized treatment classes such as EF, AF, class selector, and default. Best effort provides no differentiated treatment, and RSVP is a signaling mechanism associated with IntServ rather than the requested scalable class-based architecture.
"Interserv" is not the correct Cisco QoS model term. Therefore, the engineer should design around DiffServ, with a clear trust boundary, marking policy, queuing model, and consistent treatment across WAN and campus boundaries. Reference topics: DiffServ, DSCP, per-hop behavior, class-based QoS, scalable QoS architecture.

NEW QUESTION # 460
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