更新された2024年11月29日検証済み！合格できる300-420試験一発合格保証付き [Q172-Q191]

更新された2024年11月29日検証済み！合格できる300-420試験一発合格保証付き

無料で使える300-420サンプルには問題100%カバー率でリアル試験問題（更新された348問あります)

質問 # 172
What are two purposes of the RPF check in multicast routing? (Choose two.)

A. to ensure that multicast packets are forwarded if they arrived on the interface used to route traffic to the destination address
B. to ensure that multicast packets are forwarded if they arrived on the interface used to route traffic back to the source address
C. to ensure that multicast packets, no matter the interface they arrived on are forwarded out all interfaces
D. to ensure that multicast packets are dropped if they arrived on the interface used to route traffic back to the source address
E. to ensure that multicast packets are dropped if they arrived on the interface used to route traffic to the destination address

正解：B、E

質問 # 173
Which design consideration must be made when using IPv6 overlay tunnels?

A. Overlay tunnels that connect isolated IPv6 networks can be considered a final IPv6 network architecture.
B. Overlay tunnels can be configured only between border devices and require only the IPv6 protocol stack.
C. Overlay tunnels should only be considered as a transition technique toward a permanent solution.
D. Overlay tunneling encapsulates IPv4 packets in IPv6 packets for delivery across an IPv6 infrastructure.

正解：C

解説：
Explanation
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/xe-3s/ir-xe-3s-book/ip6-ip4-gre-tunls-
"The use of overlay tunnels should be considered as a transition technique toward a network that supports both the IPv4 and IPv6 protocol stacks or just the IPv6 protocol stack."

質問 # 174
Which OSPF area prevent LSA type 4, LSA type 5? (Choose two)

A. Stub Area
B. Totally Stubby Area
C. Not-So-Stubby Area
D. Totally Not-So-Stubby Area

正解：A、B

解説：
Stub No Type 5 AS-external LSA allowed, accepts only 1,2,3 but no 4 totaly stubby No Type 3, 4 or 5 LSAs allowed except the default summary route NSS, accepts only 1,2 and route 0.0.0.0 NSSA No Type 5 AS-external LSAs allowed, but ABR converts type 7 to type 5. It accepts type 3 and 4 totaly NSSA No Type 3, 4 or 5 LSAs except the default summary route, but ABR converts type 7 to type 5.

質問 # 175
Refer to the exhibit.

Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.)

A. use multiple equal-cost links
B. use multiple unequal-cost links
C. use an IGP
D. use HSRP
E. use R-PVSTP+

正解：A、C

質問 # 176
An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:
* IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0
* connectivity from a directly connected host 10.10.10.1/27
Which YANG data model set must the engineer choose?

A. Text, email Description automatically generated
B. Text, letter Description automatically generated
C. Text, letter Description automatically generated
D. Text, letter Description automatically generated

正解：B

質問 # 177
Which PIM mode uses a shared tree only?

A. source-specific
B. bidirectional
C. dense
D. sparse

正解：B

解説：
In bidirectional mode, traffic is routed only along a bidirectional shared tree that is rooted at the rendezvous point (RP) for the group.
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#GUID-51D0D6DF-E7F1-4A0E-8E31-D7ED464DF2AC

質問 # 178
Which two border nodes are available in the Cisco SD-Access architecture? (Choose two.)

A. internal border
B. anywhere border
C. edge border
D. intermediate border
E. extended border

正解：A、B

解説：
There are 3 types of border nodes in SD-Access:
External. Default exit from fabric with no specific routes injection
Internal. Gateway only for a set of networks, such as shared services prefixes Anywhere. Combination of external and internal functionality

質問 # 179
Refer to the exhibit. An architect must design a solution to connect the two ASs. To optimize bandwidth, the design will implement load sharing between router R6 and router R4. Which solution should the design include?

A. Use maximum-paths to install multiple paths in the routing table.
B. Configure the eBGP TTL to support eBGP multihop.
C. Use next-hop-serf attributes only for routes that are learned from eBGP peers.
D. Use update-source to specify the Loopback interface.

正解：A

質問 # 180
An engineer must design an in-band management solution for a customer with branch sites. The solution must allow remote management of the branch sites using management protocols over an MPLS WAN. Queueing is implemented at the remote sites using these classes:

How must the solution prioritize the management traffic over the WAN?

A. Mark the traffic with DSCP CS6 and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2
B. Mark the traffic with DSCP CS1 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to CIass3.
C. Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3
D. Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2.

正解：D

質問 # 181
Which two primary categories are displayed on the overall health page of the assurance component in the Cisco DNA Center? (Choose two.)

A. Access-Distribution
B. Network
C. Wired
D. Client
E. Core
F. Server

正解：B、D

質問 # 182
Drag and drop the properties from the left onto the protocols they describe on the right.

正解：

解説：

Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/166/b_166_programmability_cg/ b_166_programmability_cg_chapter_01011.html
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/169/b_169_programmability_cg/ configuring_yang_datamodel.html

質問 # 183
A customer has several remote sites connected with their headquarters through microwave links. An engineer must propose a backup WAN solution based on these conditions:

Which backup WAN link type the engineer recommend?

A. Laser link
B. 802.16 WiMAX
C. LTE
D. 802.15.1 Bluetooth

正解：C

質問 # 184
An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

A. IPFIX
B. periodic subscription
C. on-change subscription
D. static telemetry

正解：C

解説：
There are two types of subscriptions: periodic and on-change. With periodic subscription, data is streamed out to the destination at the configured interval. It continuously sends data for the lifetime of that subscription. With on-change, data is published only when a change in the data occurs such as when an interface or OSPF neighbor goes down. https://developer.cisco.com/docs/ios-xe/#!streaming-telemetry-quick-start-guide/streaming-telemetry

質問 # 185
Drag and drop the properties from the left onto the Cisco SD-WAN components that perform them on the right.

正解：

解説：

質問 # 186
Which Cisco product supports SD-Access and specifically built to address new challenges faced by enterprises?

A. Catalyst 6807-XL w/ Sup6T and C6800 10G line cards
B. CSRv virtual router
C. Nexus 7700 w/ Sup2E and M3 line cards
D. Catalyst 9500
E. ASR 1000-HX
F. ISR 4221

正解：D

質問 # 187
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?

A. R1 forwards the traffic to R3 in order to reach R2
B. R1 forwards the traffic to R3, but R3 drops the traffic
C. R1 load-balances across the paths through R3 and R4 to reach R2
D. R1 has no route to R2 and drops the traffic

正解：D

解説：
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/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html

質問 # 188

Refer to the exhibit. Where must an architect plan for route summarization for the topology?

A. from the aggregation toward the core and the aggregation toward the access
B. from the aggregation toward the access and the access toward the aggregation
C. from the core toward the aggregation and the aggregation toward the core
D. from the core toward the aggregation and the access toward the aggregation

正解：A

質問 # 189
Which two functions is the Cisco SD-Access Edge Node responsible for? (Choose two.)

A. Route and transport IP traffic
B. Map users to virtual network
C. Advertise EID subnets
D. Act as anycast layer 3 gateway
E. Act as LISP proxy tunnel router

正解：B、D

解説：
https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#EdgeNode

質問 # 190
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?