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Topics of Cisco 300-420 Exam

The Cisco 300-420 certification exam validates the students’ knowledge of enterprise design. It covers a wide range of subject areas, such as advanced addressing & routing solutions, security services, WAN, advanced enterprise campus networks, SDA, and network services. The breakdown of these topics into the components of skills to be measured in the test is as follows:

Advanced Routing and Addressing Solutions

About 25% of the exam content is covered in this domain, and the candidates have to perform their skills in the following tasks:

Developing the scalable, stable, and secure routing design for EIGRP, IS-IS, BGP, OSPF.
Creating the structured addressing strategies for both IPv6 & IPv4;

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Career Prospects

The certified professionals have the expertise in configuring and implementing the EIGRP-based solutions. Thus, they can take a prestigious job with a higher salary. Some of the roles that these individuals can explore include a Network Administrator, an IT Security Specialist, a Help Desk Technician, a Cloud Engineer, a Network Manager, a Network Engineer, and many more. The average remuneration for the certificate holders is $109,000 per annum.

Cisco Designing Cisco Enterprise Networks Sample Questions (Q136-Q141):

NEW QUESTION # 136

Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?

A. Run BFD on the inter links between EIGRP neighbors.
B. Summarize the access layer networks from the aggregation layer toward the core layer.
C. Reduce the default EIGRP hello interval and hold time.
D. Summarize the access layer networks from each access layer switch toward the aggregation layer.

Answer: A

NEW QUESTION # 137
A branch office has a primary L3VPN MPLS connection back to the main office and an IPSEC VPN tunnel that serves as backup.
Which design ensures that data is sent over the backup connection only if the primary MPLS circuit is down?

A. Use BGP with the multipath feature enabled to force traffic via the primary path when available.
B. Use EIGRP to establish a neighbor relationship with the main office via L3VPN MPLS and the IPSEC VPN tunnel.
C. Use static routes tied to an IP SLA to prefer the primary path while a floating static route points to the backup connection.
D. Use OSPF with a passive-interface command on the backup connection.

Answer: C

Explanation:
Floating static routes are static routes that are used to provide a backup path to a primary static or dynamic route, in the event of a link failure.

NEW QUESTION # 138
A company requires a private WAN design that allows remote sites to connect to HQ. The design must ensure that:
- traffic is always encrypted
- forwarding overhead is reduced
- management of security is centralized
- multicast traffic is supported
Which technology must the company select?

A. mGRE
B. DMVPN Phase 3
C. IPsec P2P
D. GET VPN

Answer: B

NEW QUESTION # 139
An engineer is designing a PIM Anycast RP solution between two data centers. The design must ensure that RP1 in DC1 and RP2 in DC2 inform each other about specific sources that have joined locally. Which solution must the engineer choose?

A. Provision the RPs on the same IP subnet and extend the subnet at Layer 2 between data centers
B. Enable MSDP between RPs using the configured Anycast RP address
C. Enable MSDP between RPs using separate unique loopback interfaces
D. No action is required because PIM registers from the source will, by default, reach each RP

Answer: C

Explanation:
In Anycast RP, two or more RPs are configured with the same IP address on loopback interfaces. The Anycast RP loopback address should be configured with a 32-bit mask, making it a host address. All the downstream routers should be configured to "know" that the Anycast RP loopback address is the IP address of their local RP. IP routing automatically will select the topologically closest RP for each source and receiver.
MSDP used for Anycast RP is an intradomain feature that provides redundancy and load-sharing capabilities.
Enterprise customers typically use Anycast RP for configuring a Protocol Independent Multicast sparse mode (PIM-SM) network to meet fault tolerance requirements within a single multicast domain.
https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.
html#wp1029118
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/115011-anycast-pim.html
" You need to have a loopback on each prospective RP router, which is different than the loopback that is being used as the RP address."

NEW QUESTION # 140
Which control-plane technology allows the same subnet to exist across multiple network locations?

A. FabricPath
B. ISE mobility services
C. VXLAN
D. LISP

Answer: D

Explanation:
Locator/ID Separation Protocol is the control-plane technology that allows endpoint identity to be separated from endpoint location. In Cisco SD-Access, LISP is used by the fabric control plane to map endpoint identifiers to routing locators, so an endpoint subnet can remain logically consistent even when endpoint reachability is provided from different network locations. This is why LISP is associated with host mobility and with designs where the same subnet or endpoint identity can exist across multiple places without forcing the physical topology to be a single stretched Layer 2 domain. VXLAN is the data-plane encapsulation used to carry overlay traffic, but VXLAN itself is not the mapping control plane. FabricPath is a Cisco Layer 2 multipath technology and does not provide LISP-style endpoint-location mapping. ISE mobility services are identity and policy functions, not a routing locator mapping system. Therefore, the correct control-plane technology is LISP. Cisco SD-Access design material describes the control plane as the mapping system that maintains endpoint-to-device relationships.

NEW QUESTION # 141
......

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