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Cisco 300-420 Practice Test - Questions Answers, Page 3
List of questions
Question 21
What are two benefits of designing an SD-WAN network fabric with direct Internet access implemented at every site? (Choose two.)
It decreases latency to applications hosted by public cloud service provider.
It decreases latency on Internet circuits.
It increases the speed of delivery of site deployments through zero-touch provisioning.
It increases the total available bandwidth on Internet circuits.
It alleviates network traffic on MPLS circuits.
Question 22
Which routes does the overlay management protocol advertise in an SD-WAN overlay?
underlay, MPLS, and overlay
primary, backup, and load-balanced
prefix, TLOC, and service
Internet, MPLS, and backup
Question 23
A network solution is being designed for a company that connects to multiple Internet service providers. Which Cisco proprietary BGP path attribute will influence outbound traffic flow?
Local Preference
MED
Weight
AS Path
Community
Question 24
Refer to the exhibit.
EIGRP has been configured on all links. The spoke nodes have been configured as EIGRP stubs, and the WAN links to R3 have higher bandwidth and lower delay than the links to R4. When a link failure occurs at the R1-R2 link, what happens to traffic on R1 that is destined for a subnet attached to R2?
R1 has no route to R2 and drops the traffic
R1 load-balances across the paths through R3 and R4 to reach R2
R1 forwards the traffic to R3, but R3 drops the traffic
R1 forwards the traffic to R3 in order to reach R2
The EIGRP stub routing feature will prevent the remote device from advertising core routes back to the distribution devices. Routes learned by the remote device from Distribution 1 will not be advertised to Distribution 2. Therefore,
Distribution 2 will not use the remote device as a transit for traffic destined to the network core https://www.cisco.com/c/en/us/td/docs/iosxml/ ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html
Question 25
A company is using OSPF between its HQ location and a branch office. HQ is assigned area 0 and the branch office is assigned area 1. The company purchases a second branch office, but due to circuit delays to HQ, it decides to connect the new branch office to the creating branch office as a temporary measure. The new branch office is assigned area 2. Which OSPF configuration enables all three locations to exchange routes?
The existing branch office must be configured as a stub area
A virtual link must be configured between the new branch office and HQ
A sham link must be configured between the new branch office and HQ
The new branch office must be configured as a stub area
Question 26
An engineer must design a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees.
Which multicast protocol satisfies these requirements?
PIM-SSM
PIM-SM
MSDP
BIDIR-PIM
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-tech-oview.html
Bidir-PIM is designed to be used for many-to-many applications within individual PIM domains.
Multicast groups in bidirectional PIM mode can scale to an arbitrary number of sources without incurring overhead due to the number of sources.
Question 27
An engineer is working for a large cable TV provider that requires multiple sources streaming video on different channels using multicast with no rendezvous point. Which multicast protocol meets these requirements?
PIM-SM
PIM-SSM
any-source multicast
BIDIR-PIM
PIM-SSM is suitable for when well-known sources exist within the local PIM domain and for broadcast applications. Also, PIM-SSM eliminates the RPs and shared trees
Question 28
What is one function of the vSmart controller in an SD-WAN deployment?
orchestrates vEdge and cEdge connectivity
responsible for the centralized control plane of the SD-WAN network
provides centralized network management and a GUI to monitor and operate the SD-WAN overlay
provides a data-plane at branch offices to pass traffic through the SD-WAN network
Question 29
When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?
encapsulation of traffic with GRE or VTI
IPsec forwarding using transport mode
additional bandwidth for headend
IPsec forwarding using tunnel mode
Question 30
How do endpoints inside an SD-Access network reach resources outside the fabric?
a VRF fusion router is used to map resources in one VN to another VN
Fabric borders use VRFs to map VNs to VRFs
SD-Access transit links are used to transport encapsulated traffic from one fabric to another
A fabric edge is used to de-encapsulate VXLAN traffic to normal IP traffic then transported over the outside network
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html"
Packets and frames sourced from inside the fabric and destined outside of the fabric are de-encapsulatedby the border node"(not the edge node)
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