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質問 # 172
How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?
- A. Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP
- B. Border nodes first register endpoints and then update the HTDB
- C. Fabric APs update the HTDB with the clients' ElD and RLOC
- D. Fabric WLCs update the HTDB as new clients connect to the wireless network
正解：D
解説：
質問 # 173
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：
Explanation
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 # 174
An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)
- A. violating
- B. shaping
- C. conforming
- D. bursting
- E. marking
正解：B、E
質問 # 175 
Refer to the exhibit. Area 10 is a regular OSPF area and networks 10.1.1.0/24 and 172.16.1.0/24 are internal.
Which design provides optimal routing between both networks when the link between routers C and E fails?
- A. Create a tunnel between routers E and F in area 10.
- B. Create an OSPF virtual link between routers E and F.
- C. Make area 10 a not-so-stubby area.
- D. Move the link between routers C and D to area 10.
正解：D
質問 # 176
Which two statements are true regarding Cisco ISE? (Choose two.)
- A. The major business outcomes of ISE are enhanced user experience and secure VLAN segmentation.
- B. Without integration with any other product ISE can track the actual physical location of a wireless endpoint as it moves.
- C. ISE plays a critical role in SD-Access.
- D. An ISE deployment requires only a Cisco Access Control System appliance.
- E. ISE can provide data about when a specific device connected to the network.
正解：C、E
質問 # 177
Refer to the exhibit.
A network engineer must design a multicast solution based on:
* Many-to-many communications between the users and sources
* Support of up to 50 multicast sources
* Users that must register for steams
Which multicast solution must the engineer select?
- A. Bidirectional PIM
- B. Multicast VPN
- C. Any Source Multicast
- D. Source-Specific Multicast
正解：A
質問 # 178
Drag and Drop Question
Drag and drop the model-driven telemetry considerations from the left onto the modes they apply to on the right.
正解：
解説：
質問 # 179
Refer to the exhibit.
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 existing network solution is using BFD in echo mode. Several of the network devices are experiencing high CPU utilization which an engineer has determined is related to the BFD feature. Which solution should the engineer leverage to reduce the CPU load?
- A. Implement slow timers between peers with low CPU resources.
- B. Enable BFD multi-hop on the devices with low CPU resources.
- C. Utilize carrier delay on all routers in the network.
- D. Implement BED asynchronous mode between peers with low CPU resources.
正解：A
質問 # 181
An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?
- A. /25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch
- B. /24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12
- C. /24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15
- D. /24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous /24 prefix per site
正解：D
解説：
For example:
Site 0001
Data:10.0.0.0/24
Voice: 10.0.1.0/24
summary route : 10.0.0.0/23
Site 0002
Data:10.0.2.0/24
Voice: 10.0.3.0/24
summary route: 10.0.2.0/23
....cont...
site 0129
Data:10.1.0.0/24
Voice: 10.1.1.0/24
summary route: 10.1.0.0/23
site 0130
Data:10.1.2.0/24
Voice: 10.1.3.0/24
summary route: 10.1.2.0/23
so 3rd octet is odd number assigned to voice, and even number assigned to data; for security team to recongize voice prefix, use an ACL with wildcast to filter odd number on third octet, started from 10.0.1.0 0.0.254.255, 10.1.1.0 0.0.254.255......, 10.1.1.0 0.0.254.255 etc; for 10.0.1.0 0.0.254.255, any IP in binary that started with 00001010.00000000.xxxxxxx1.xxxxxxxx will be matched (x = either 0 or 1), covert 3rd octet into dec, for example, 10000001 = 129 which is a voice VLAN.
質問 # 182
Which three pieces of information are carried on OSPF type 3 LSAs? (Choose three)
- A. metric
- B. IP subnet
- C. authentication type
- D. subnet mask
- E. link state
- F. external route tag
正解：A、B、D
解説：
There is IP prefix (192.168.1.0), Network Mask (/24) and a Metric (10). See below:
R1#show ip ospf database summary
OSPF Router with ID (1.1.1.1) (Process ID 1)
Summary Net Link States (Area 10)
Routing Bit Set on this LSA
LS age: 872
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 192.168.1.0 (summary Network Number)
Advertising Router: 2.2.2.2
LS Seq Number: 8000000B
Checksum: 0xE0D5
Length: 28
Network Mask: /24
TOS: 0 Metric: 10
質問 # 183
Which OSPF area blocks LSA Type 3, 4 and 5, but allows a default summary route?
- A. NSSA
- B. normal
- C. stub
- D. totally stubby
正解：D
解説：
Section: Advanced Addressing and Routing Solutions
質問 # 184
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 # 185
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 # 186
Which Cisco vEdge router offers 20 Gb of encrypted throughput?
- A. Cisco vEdge 1000
- B. Cisco vEdge 2000
- C. Cisco vEdge 100
- D. Cisco vEdge 5000
正解：D
質問 # 187
Which two routing protocols allow for unequal cost load balancing? (Choose two.)
- A. OSPF
- B. IS-IS
- C. BGP
- D. RIPng
- E. EIGRP
正解：A、E
解説：
Unequal cost load balancing is a feature that allows traffic to be distributed across unequal-cost paths to the same destination, which can increase network utilization and improve overall performance.
EIGRP (Enhanced Interior Gateway Routing Protocol) and OSPF (Open Shortest Path First) are two routing protocols that support unequal cost load balancing.
In EIGRP, unequal cost load balancing can be achieved by adjusting the "variance" parameter, which is a multiplier that determines the maximum metric of a feasible successor. The feasible successor is a backup route that meets the feasibility condition, which means its reported distance (the sum of the metric from the successor router and the advertised distance to the destination) is less than the current best path's metric. By default, EIGRP only considers successors with the same metric as the best path, but by increasing the variance, EIGRP can include feasible successors with higher metrics.
In OSPF, unequal cost load balancing can be achieved by enabling the "variance" command, which allows OSPF to use paths with metrics that are up to a certain multiple of the best path's metric. For example, if the variance is set to 2, OSPF can use paths with a metric that is up to twice the metric of the best path.
IS-IS (Intermediate System to Intermediate System) and BGP (Border Gateway Protocol) do not support unequal cost load balancing.
RIPng (Routing Information Protocol next generation) is a distance-vector routing protocol that does not support unequal cost load balancing.
質問 # 188
Refer to the exhibit.
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
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. Decrease the BGP keepalive timer
- B. Utilize BFD and tune the multiplier to 50
- C. Utilize BFD and keep the default BGP timers
- D. Lower the BGP hello interval
正解：C
解説：
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.
質問 # 190
Which PIM mode uses a shared tree only?
- A. source-specific
- B. dense
- C. sparse
- D. bidirectional
正解：C
解説：
The PIM mode that uses a shared tree only is the sparse mode. In sparse mode, PIM routers build a shared tree for multicast traffic, which is shared among all of the routers in the multicast domain. The shared tree is built from the source routers to the rendezvous point (RP) and then from the RP to the receivers. The advantage of sparse mode is that it requires less state information on the routers.
質問 # 191
Drag and drop the characteristics from the left onto the YANG models they describe on the right. Not all options are used.
正解：
解説：
質問 # 192
A network engineer must optimize a campus OSPF deployment Currently each time a type 1 or type 2 LSA is generated within an area, the OSPF process must recompute the entire SPT Which solution improves the recomputation process?
- A. BFD
- B. iSPF
- C. PRC
- D. SPF
正解：A
質問 # 193
Refer to the exhibit. Currently the network uses a single-homed solution for connecting to the internet. An engineer must design a more resilient WAN using the internet circuits at each site.
The design must provide failover connectivity, support load-sharing of traffic, and QoS. Which solution must the engineer choose?
- A. DMVPN
- B. IPsec tunnels
- C. Get VPN
- D. SD-WAN
正解：D
質問 # 194
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 NHRP.
- B. Verify the GRE tunnels.
- C. Verify ISAKMP.
- D. Verify crypto maps.
正解：B
質問 # 195
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