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質問 # 24 
Refer to the exhibit. Using the provided XML snippet, which Xpath expression prints "Jane"?
- A. //employee[0]/firstName/text()
- B. //employee[1]/firstName/value()
- C. //employee[0]/firstName/value()
- D. //employee[1]/firstName/text()
正解：A
解説：
Section: 3.0 Network Device Programmability
質問 # 25
An engineer must change from using NETCONF for streaming telemetry to telemetry data using gRPC framework because NETCONF uses XML for message and payload encoding. Which two messages and payload encodings does gNMI use? (Choose two.)
- A. gNMI notifications with XML
- B. JSON payload
- C. protobuf payload
- D. protobuf notifications with XML
- E. gNMI notifications with JSON
正解：C、E
解説：
Section: 2.0 Automation APIs and Protocols
Explanation/Reference: https://books.google.com/books?id=4AqXDwAAQBAJ&pg=PT131&lpg=PT131&dq=messages+and
+payload+encodings+does+gNMI
+use&source=bl&ots=81hpFjIZ_9&sig=ACfU3U1EAEwjRMBnCiHNESBwFLHvZDHkBw&hl=en&sa=X&ved=2a hUKEwjirNeZptfpAhXDoFsKHeqMBFsQ6AEwBHoECAsQAQ#v=onepage&q=messages%20and%20payload%
20encodings%20does%20gNMI%20use&f=false
質問 # 26 
Refer to the exhibit. Regarding the Python script using YDK, what is the result for a device that is running Cisco IOS XR Software?
- A. configures the system time
- B. prints the uptime of the CRUDService
- C. retrieves the system time
- D. prints the system uptime
正解：D
解説：
Section: 2.0 Automation APIs and Protocols
質問 # 27
Drag and Drop Question
Drag and drop the code from the bottom onto the box where the code snippets are missing to deploy an OSPF process on a Cisco IOS XE device by using ncclient. Options may be used more than once. Not all options are used.
正解：
解説：
Explanation:
First blank (after "from ncclient import")
manager
Second blank (with "with ________.connect")
manager
Third blank (within <ospf> <______> <id>100</id> ...)
process-id
Fourth blank (within <router-id>1.1.1.1</router-id> </______>)
process-id
Fifth blank (after "reply = m.________(rpc, target='running')")
edit_config
The manager module is imported from ncclient.
The connection is established using manager.connect.
The <process-id> XML tag is used in the OSPF process section.
The configuration is sent using edit_config.
質問 # 28
What tool is used to perform a "what if" failure analysis in a service provider network that is running Segment Routing?
- A. Cisco Network Services Orchestrator
- B. Cisco Segment Routing Path Computation Element
- C. Cisco Evolved Programmable Network Manager
- D. Cisco WAN Automation Engine
正解：D
解説：
Reference:
https://www.cisco.com/c/en/us/products/routers/wan-automation-engine/index.html
質問 # 29
Refer to the exhibit.
Which two URI entries are optional and functional in this RESTCONF URI structure? (Choose two.)
- A. operation
- B. api-entry
- C. path
- D. fragment
- E. query
正解：C、E
解説：
Reference:
https://www.ciscolive.com/c/dam/r/ciscolive/apjc/docs/2016/pdf/DEVNET-1081.pdf page 25
質問 # 30
A network engineer is implementing a new network using NETCONF. The goal is to automate but also harden the device configuration. Which NETCONF action must be used to accomplish this goal?
- A. Enable CoPP.
- B. Specify the source interface for SSH.
- C. Limit access to port 830, well-known clients, and SSH VTY.
- D. Configure by using the ip http secure-server command.
正解：C
解説：
To securely automate device configuration with NETCONF, limit access to port 830, restrict connections to well-known clients, and use only SSH VTY for NETCONF sessions.
質問 # 31
When implementing MPLS DS-TE on Cisco IOS XR routers, all aggregate Cisco MPLS TE traffic is mapped to which class type by default?
- A. class-type 1 (bandwidth subpool)
- B. class-type 0 (bandwidth global pool)
- C. class type class-default (bandwidth best-effort)
- D. class-type 2 (bandwidth priority)
正解：B
解説：
Explanation
Explanation:
Differentiated Services Traffic Engineering
MPLS Differentiated Services (Diff-Serv) Aware Traffic Engineering (DS-TE) is an extension of the regular MPLS-TE feature. Regular traffic engineering does not provide bandwidth guarantees to different traffic classes. A single bandwidth constraint is used in regular TE that is shared by all traffic. To support various classes of service (CoS), users can configure multiple bandwidth constraints. These bandwidth constraints can be treated differently based on the requirement for the traffic class using that constraint.
MPLS diff-serv traffic engineering provides the ability to configure multiple bandwidth constraints on an MPLSenabled interface. Available bandwidths from all configured bandwidth constraints are advertised using IGP.
TE tunnel is configured with bandwidth value and class-type requirements. Path calculation and admission control take the bandwidth and class-type into consideration. RSVP is used to signal the TE tunnel with bandwidth and class-type requirements.
Diff-Serv TE can be deployed with either Russian Doll Model (RDM) or Maximum Allocation Model (MAM) for bandwidth calculations.
TE Class Mapping
Each of the eight available bandwidth values advertised in the IGP corresponds to a TE Class. Because the IGP advertises only eight bandwidth values, there can be a maximum of only eight TE classes supported in an IETF DS-TE network.
TE class mapping must be exactly the same on all routers in a DS-TE domain. It is the responsibility of the operator configure these settings properly as there is no way to automatically check or enforce consistency.
The operator must configure TE tunnel class types and priority levels to form a valid TE class. When the TE class map configuration is changed, tunnels already up are brought down. Tunnels in the down state, can be set up if a valid TE class map is found.
Table 4 TE Classes and Priority
The default mapping includes four classes types.
質問 # 32
An engineer wants to replace the BLOCK_BAD ACL on the Cisco IOS XE router with this new content. The engineer wants to use RESTCONF for this and constructs a PUT request to the resource/restconf/data/native/ip/access-list/Cisco-IOS-XE-acl:extended=BLOCK_BAD. What must the body look like to achieve the Cisco IOS XE configuration?
Desired configutation:
ip access-list extended BLOCK_BAD
permit ip any host 192.168.20.1
deny ip any any
A)
B)
C)
D)
- A. Option C
- B. Option A
- C. Option D
- D. Option B
正解：C
質問 # 33
Refer to the exhibit.
Using the provided XML snippet, which Xpath expression prints "Jane"?
- A. //employee[0]/firstName/text()
- B. //employee[1]/firstName/value()
- C. //employee[0]/firstName/value()
- D. //employee[1]/firstName/text()
正解：A
質問 # 34
Which data format should be used to serialize structured data in the most compact way?
- A. JSON
- B. YAML
- C. protobufs
- D. XML
正解：B
解説：
Section: 3.0 Network Device Programmability
Explanation/Reference: https://www.sitepoint.com/data-serialization-comparison-json-yaml-bson-messagepack/
質問 # 35
Which two use cases are valid for Cisco WAN Automation Engine? (Choose two.)
- A. device manager
- B. network controller
- C. integration with Cisco XTC
- D. deployment of SR policies
- E. what-if analysis
正解：C、E
質問 # 36
Which API style is commonly used for remote procedure calls (RPC)?
- A. GraphQL
- B. JSON-RPC
- C. REST
- D. SOAP
正解：B
質問 # 37
What is the architecture of Cisco Network Services Orchestrator (NSO)?
- A. Centralized
- B. Peer-to-peer
- C. Client-server
- D. Distributed
正解：A
質問 # 38
What is a difference between JSON and XML in regard to data types?
- A. JSON uses arrays, whereas XML supports comments.
- B. JSON is binary, whereas XML is human-readable.
- C. JSON is human-readable, whereas XML is binary.
- D. JSON uses comments, whereas XML supports arrays.
正解：A
解説：
JSON natively supports arrays as a data type, whereas XML allows comments but does not have a native array type.
質問 # 39
Which two Python libraries are used to write a script to retrieve network device information using RESTCONF? (Choose two.)
- A. json
- B. requests
- C. PySNMP
- D. YANG
- E. ncclient
正解：A、B
質問 # 40
Refer to the exhibit.
Which command prints out (44, 22) when this code is run on Python 3?
- A. print(swap2(22, 44))
- B. print(swap1(d, b))
- C. print(swap2(a, b))
- D. print(swap1(b, d))
正解：D
質問 # 41
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