300-420 Online Lab Simulation & Exam 300-420 Preparation

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Cisco 300-420 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Advanced Enterprise Campus Networks	25%	- Layer 3 campus design 1. Virtualization and segmentation 2. Routing in campus infrastructure - Wireless integration - Layer 2 campus design 1. Hierarchical architecture 2. VLAN and trunking design 3. Spanning Tree Protocol optimization
Topic 2: Security Services	10%	- Secure connectivity - Security architecture design 1. Threat defense integration 2. Network segmentation
Topic 3: Software-Defined Access (SDA)	5%	- Fabric design and deployment - Control plane and data plane design - SD-Access architecture
Topic 4: WAN for Enterprise Networks	20%	- VPN design 1. Site-to-site VPN 2. DMVPN, L2VPN, L3VPN - WAN resiliency and high availability - WAN connectivity options 1. MPLS, Metro Ethernet, 4G/5G 2. SD-WAN architecture and design
Topic 5: Advanced Addressing and Routing Solutions	25%	- Routing protocol design 1. OSPF design 2. Route redistribution and filtering 3. EIGRP design 4. IS-IS design - IPv4 and IPv6 addressing design 1. Structured addressing plans 2. Route summarization and aggregation
Topic 6: Network Services	15%	- Quality of Service (QoS) 1. Classification and marking 2. Policing, shaping, congestion management - Multicast design - IP services 1. DHCP, DNS, NAT

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Cisco Designing Cisco Enterprise Networks Sample Questions (Q118-Q123):

NEW QUESTION # 118
Prior to establishing full-mesh iPsec tunnels in a typical Cisco SD-WAN deployment, which mechanism do WAN Edge routers use to exchange Key information for data plane encryption?

A. They use vManage as a key exchange server.
B. They use vSmart controllers as key exchange servers.
C. They use IKEv2 when exchanging keys with each other.
D. They use vBond as a key exchange server.

Answer: B

Explanation:
Cisco SD-WAN uses the vSmart controller as the control-plane component that distributes the information needed for secure data-plane tunnel establishment. Before WAN Edge devices build full-mesh IPsec tunnels, they must learn reachability and security information through the SD-WAN control plane. Cisco documentation describes the vSmart controller as the centralized control-plane element that exchanges OMP routes, policy, TLOC information, and security parameters with WAN Edge routers. In the traditional SD- WAN key-exchange model, vSmart sends IPsec encryption keys to edge devices so the data plane can be secured without each edge independently negotiating IKEv2 with every other edge. vManage is the management platform and is not the key exchange point. vBond performs orchestration, authentication assistance, and NAT traversal during onboarding, but it is not the data-plane key server. IKEv2 may be used in specific newer or configured security models, but the typical Cisco SD-WAN overlay relies on vSmart for scalable key distribution. Reference topics: Cisco SD-WAN control plane, vSmart, OMP, IPsec key distribution, WAN Edge security.

NEW QUESTION # 119
A company with multiple service providers wants to speed up BGP convergence time in the event a failure occurs with their primary link.
Which approach achieves this goal and does not impact router CPU utilization?

A. Utilize BFD and keep the default BGP timers
B. Utilize BFD and tune the multiplier to 50
C. Decrease the BGP keepalive timer
D. Lower the BGP hello interval

Answer: A

Explanation:
The issue is to speed up BGP convergence time in the event a FAILURE occurs and keep the CPU utilisation low - then BFD is the solution.

NEW QUESTION # 120

Refer to the exhibit. An architect must design an IP addressing scheme for a multisite network connected via a WAN transit. The campus site must accommodate 12,000 devices and the branch sites must accommodate
1,000 devices. Which address scheme optimizes network device resources, contains convergence events to the different blocks of the network, and ensures future growth of the network?

A. * Campus: 10.0.0.0/10
*Branch1: 10.64.0.0/10
*Branch2: 10.128.0.0/10
B. * Campus: 10.0.0.0/16
*Branchi: 10.255.0.0/20
*Branch2: 10.255.16.0/20
C. * Campus: 10.0.0.0/20
*Branch1: 10.0.64.0/21
Branch2: 10.0.128.0/21
D. Campus: 10.0.0.0/18
*Branch1: 10.0.192.0/21
*Branch2: 10.0.200.0/21

Answer: D

NEW QUESTION # 121
Refer to the exhibit. As part of a design review of redistribution, a client requested that R2 be preferred over R3 for traffic passing toward the EIGRP domain. Which method meets this design requirement?

A. Redistribute EIGRP into OSPF with metric-type E1 on R2 and metric-type E2 on R3.
B. Redistribute OSPF into EIGRP with metric 10000 100 255 1 1500 on R2 and metric 10 1000 255
1 1500 on R3.
C. Remove the mutual redistribution on R3.
D. Redistribute EIGRP into OSPF with metric-type E2 on R2 and metric-type E1 on R3.

Answer: A

Explanation:
OSPF prefers E1 routes over E2 routes when both exist for the same destination. Redistributing EIGRP as E1 on R2 and as E2 on R3 makes R2 the preferred path for OSPF traffic heading toward the EIGRP domain.

NEW QUESTION # 122

Refer to the exhibit. An architect is designing a Layer 3 campus network The design must hide network instability, reduce network overhead, and conserve critical device memory Which route summarization solution must the architect select?

A. * The aggregation layer must advertise a default route toward the core layer
* The VLAN subnets must be summarized into 10 0 0 0.116 at the aggregation layer and advertised to the access layer
B. * The core layer must advertise a default route toward the aggregation layer
* The VLAN subnets must be summarized into 10 0 0 0/16 at the access layer and advertised to the aggregation layer
C. * The core layer must advertise a default route toward the aggregation layer
* The VLAN subnets must be summarized into 10 0 0 0.'16 at the aggregation layer and advertised to the core layer
D. * The aggregation layer must advertise a default route toward the access layer.
* The VLAN subnets must be summarized into 10 0.0 0/16 at the aggregation layer and advertised to the core layer

Answer: D

NEW QUESTION # 123
......

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