Deck 16: Designing Cisco Data Center Infrastructure (DCID)

Question 1

Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

A) Apply a QPPB route policy to the BGP process using the table-policy command
B) Apply a QPPB route policy to the BGP neighbor using the route-policy command
C) Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group
D) Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set the BGP community
E) Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qos-group destination|source command
F) Enable QPPB on an interface using the ipv4 bgp policy propagation output ip-precedence|qos-group destination|source command

Answer 1

Apply a QPPB route policy to the BGP process using the table-policy command
Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group
Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qos-group destination|source command

Question 2

Referring to the Cisco IOS XR configuration exhibit, which labels will be advertised by the router with this configuration?

A) Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.
B) Labels for all prefixes will be advertised to the 10.1.1.1 LDP peer.
C) Labels for all prefixes will be advertised to all the LDP peers.
D) No labels will be advertised to any LDP peers.

Answer 2

Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.

Question 3

Which of the following three statements are correct regarding IPv6 QoS?  (Choose three.)

A) The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.
B) A 20-bit flow label field enables per-flow processing.
C) DS-TE is not supported by IPv6.
D) Per-hop behavior in IPv6 networks is based on EXP bits.
E) IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

Answer 3

The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.
A 20-bit flow label field enables per-flow processing.
IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

Question 4

On the Cisco IOS XR, when using the match protocol command within a class-map to classify traffic, you noticed that the match protocol option on the Cisco IOS XR shows much fewer protocol options than on the Cisco IOS or IOS XE, like there is no option such as the match protocol yahoo-messenger command on the Cisco IOS XR. Why is this?

A) because the Cisco IOS XR router does not have the correct software packages installed
B) because when defining the class-map, the class-map type should be set to type inspect: class-map type inspect class-map-name command
C) because NBAR is not supported on the Cisco IOS XR
D) because flexible packet matching has not been enabled on the Cisco IOS XR router

Question 5

Refer to the Cisco IOS XR policy-map configuration exhibit. What is wrong with the policy-map configuration?

A) missing the priority percent command under class one and class two
B) missing the police command under class one and class two
C) missing the police command under class three
D) missing the priority bandwidth command under class one and class two
E) missing the bandwidth command under class one and class two

Question 6

Which Cisco IOS XR command should be used in order to enable LDP-IGP synchronization for the ISIS IGP protocol?

A) RP/0/RSP0/CPU0:R1(config-isis-if-af)#mpls ldp sync
B) RP/0/RSP0/CPU0:R1(config-isis)#mpls ldp sync
C) RP/0/RSP0/CPU0:R1(config-ldp)#isis ldp sync
D) LDP-IGP synchronization is not supported for the ISIS IGP protocol on Cisco IOS XR platforms

Question 7

When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority command on a Cisco ASR9K router, which additional QoS command is required for this traffic class?

A) shape
B) police
C) random-detect
D) bandwidth

Question 8

Only based on the Cisco IOS XR policy-map configuration exhibit, which statement is correct?

A) All DSCP AF41 marked packets will be dropped when the average queue length reaches 12,000 packets.
B) DSCP AF11 marked packets will be randomly dropped when the average queue length reaches 10,000 packets.
C) DSCP AF11 and AF41 marked packets are guaranteed a minimum bandwidth of 1 Mb/s.
D) DSCP AF11 and AF41 marked packets are guaranteed a maximum bandwidth of 1 Mb/s.

Question 9

Referring to the Cisco IOS XR show command output exhibit, what are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

A) GigabitEthernet0/1/0/10 is not configured to run LDP.
B) Graceful restart is not configured on the peer.
C) The LDP neighbor on GigabitEthernet0/1/0/10 is not up.
D) The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.
E) LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.
F) GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.

Question 10

Which item is not available to be used for QoS classification in Cisco IOS XR?

A) MAC SA
B) protocol
C) inner EXP
D) discard-class
E) QoS-group
F) VLAN

Question 11

On the Cisco IOS XR, which MQC configuration is different than on the Cisco IOS and IOS XE?

A) On the Cisco IOS XR, WRED can only be applied in the output direction.
B) On the Cisco IOS XR, marking can only be applied in the input direction.
C) On the Cisco IOS XR, LLQ can be applied in the input or output direction.
D) On the Cisco IOS XR, LLQ can use up to four priority queues: level 1, level 2, level 3, and level 4.

Question 12

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 0 (bandwidth global pool)
B) class-type 1 (bandwidth subpool)
C) class-type 2 (bandwidth priority)
D) class type class-default (bandwidth best-effort)

Question 13

When implementing MPLS TE tunnels on Cisco IOS XR routers, what is the tunnel setup and hold priority value range, and which value has the highest priority?

A) 0-63, where 0 is the highest priority
B) 0-63, where 63 is the highest priority
C) 0-7, where 0 is the highest priority
D) 0-7, where 7 is the highest priority

Question 14

In which two Cisco IOS XR configuration modes can mpls ldp igp sync be configured?  (Choose two.)

A) config-ldp
B) config-if
C) config-ospf-ar
D) config-ospf
E) config-isis

Question 15

The Cisco IOS and IOS XE qos pre-classify command allows which kind of packet classification on IP packets that are encapsulated with GRE and IPsec?

A) allows for packets to be classified based on the ToS byte values before packet encryption
B) allows for packets to be classified based on the ToS byte values after packet encryption
C) allows for packets to be classified based on the packet payload before packet encryption
D) allows for packets to be classified based on the packet payload after packet encryption
E) allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

Question 16

When configuring class-based WRED on Cisco routers, which WRED parameter is not user configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?

A) the ingress or egress direction where the class-based WRED policy will be applied
B) the maximum threshold
C) the minimum threshold
D) the mark probability denominator

Question 17

On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?

A) LLQ
B) LPTS
C) Committed Access Rate
D) Control Plane Policing
E) Management Plane Protection
F) NetFlow
G) ACL

Question 18

Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

A) LDP session protection
B) LDP-IGP synchronization
C) BFD
D) IGP session protection

Question 19

When troubleshooting LDP operations on the Cisco IOS and IOS XE routers, what is one of the first things that should be verified?

A) if running OSPF as the IGP, ensure that OSPFv3 has been enabled
B) check if the ip cef command has been enabled
C) verify in the running configurations that all of the required LDP interfaces are defined under the mpls ldp command configuration mode
D) verify if there are any access lists that are denying TCP and UDP port 464 packets

Question 20

Refer to the Cisco IOS XR configuration exhibit. Which statement is correct?

A) The backup tunnel-te 10 tunnel is using the highest setup and hold priority settings of 7.
B) The backup tunnel path is learned dynamically.
C) The fast-reroute command is missing under the (config-mpls-te-if)# configuration mode.
D) Interface gi0/0/0/10 is the protected link.

Question 21

Which method maps MPLS EXP bit 5 to COS 5 on Cisco IOS XE?

A)
B)
C)
D)
E)

Question 22

Which two use cases are valid for Cisco WAN Automation Engine? (Choose two.)

A) deployment of SR policies
B) integration with Cisco XTC
C) what-if analysis
D) device manager
E) network controller

Question 23

An automation engineer is trying to configure a destination group to use dial-out telemetry with gRPC on a Cisco IOS XR platform. The template created is failing to apply. Which parameters must be configured?

A) source IP address, source port, encoding, and sampling interval
B) source IP address, source port, encoding, and protocol
C) destination IP address, destination port, encoding, and sensor path
D) destination IP address, destination port, encoding, and protocol

Question 24

What are two characteristics of the NFV architecture approach? (Choose two.)

A) It decouples the network functions from proprietary hardware appliances.
B) It provides 70% more efficiency of network infrastructure.
C) It is specially designed for Internet providers.
D) It is specially designed for telecommunications service providers.
E) It typically includes a hypervisor.

Question 25

What is a primary difference between QoS operations on IOS and IOS XR?

A) IOS XR features multi-level LLQ
B) IOS XR automatically polices the LLQ
C) IOS XR does not support NBAR
D) IOS XR cannot set FR-DE

Question 26

Which two Python libraries are used to write a script to retrieve network device information using RESTCONF? (Choose two.)

A) PySNMP
B) requests
C) ncclient
D) YANG
E) json

Question 27

Which Cisco IOS XR command should be used in order to enable LDP on all interfaces for which the IGP protocol is enabled?

A) RP/0/0/CPU0:R1(config-ospf)#mpls ldp auto-config
B) RP/0/0/CPU0:R1(config-ospf)#mpls ldp interface all enable
C) RP/0/0/CPU0:R1(config-ospf)#enable all
D) RP/0/0/CPU0:R1(config-ldp)#enable all

Question 28

What is a key feature of YANG?

A) use identification
B) error prediction
C) JAVA compatibility
D) reusable types and groupings

Question 29

Which two commands generate a template using Cisco NSO to build a service package? (Choose two.)

A) show running-config devices device ce-ios config ios:interface Loopback 0 | display template.xml
B) show running-config devices device ce-ios config ios:interface Loopback 0 | display xml | save template.xml
C) request running-config devices device ce-ios config ios:interface Loopback 0 | display xml
D) show running-config devices device ce-ios config ios:interface Loopback 0
E) show running-config devices device ce-ios config ios:interface Loopback 0 | display xml

Question 30

What is a benefit of Ansible for automating IOS XE or IOS XR platforms?

A) Playbooks can be written in XML format.
B) It has agent support
C) It supports asynchronous orchestration.
D) It offers native orchestration support for Cisco platforms.

Question 31

Which option is the appropriate method for CBWFQ WRED implementation in Cisco IOS XR?

A)
B)
C)
D)

Question 32

What tool is used to perform a "what if" failure analysis in a service provider network that is running Segment Routing?

A) Cisco WAN Automation Engine
B) Cisco Evolved Programmable Network Manager
C) Cisco Network Services Orchestrator
D) Cisco Segment Routing Path Computation Element

Question 33

An engineer is deploying a Python script to manage network devices through SSH. Which library based on Paramiko is used?

A) sshmiko
B) paramiko.agent
C) libssh2
D) netmiko

Question 34

Refer to the partial Cisco IOS XR configurations exhibit for Router 1 and Router 2. There are two routers that are connected back to back over the Gigabit Ethernet link. If the "show mpls ldp neighbor" command output on Router 1 does not show LDP peering with Router 2, what could be the possible root cause of the LDP peering problem?

A) missing interface under OSPF IGP configuration
B) hello timers mismatch on Router 1 and Router 2
C) password for LDP session mismatch on Router 1 and Router 2
D) MPLS LDP session protection is not configured

Question 35

Which Cisco IOS XR command should be used to identify if MPLS TE FRR is enabled?

A) show mpls traffic-eng tunnel
B) show mpls frr
C) show mpls traffic-eng protection
D) show mpls protection
E) show mpls fast-reroute

Question 36

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) protobuf notifications with XML
C) protobuf payload
D) JSON payload
E) gNMI notifications with JSON

Question 37

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) retrieves the system time
B) configures the system time
C) prints the uptime of the CRUDService
D) prints the system uptime

Question 38

Which command configures the remote peer when the Cisco IOS XR Traffic Controller is used?

A) peer-sync ipv4 192.168.0.3
B) state ipv4 192.168.0.3
C) peer ipv4 192.168.0.3
D) state-sync ipv4 192.168.0.3

Question 39

A Cisco NSO service has just been deployed. Which Cisco NSO CLI command is used to inspect the resulting device configuration changes before the changes are pushed to the network?

A) show service impact
B) commit dry-run outformat native
C) pseudo-commit
D) show dry-run output

Question 40

Refer to the exhibit. What is the result of the Ansible task?

A) It configures a Cisco IOS XR router with BGP AS65000 with two neighbors and redistributes OSPF into BGP.
B) It validates the BGP configuration on a Cisco IOS XR router, but it is a read-only module and cannot modify the configuration on the router.
C) It validates the BGP configuration on a Cisco IOS XE router, but it is a check mode-only network module and cannot modify the configuration on the router.
D) It configures a Cisco IOS router with BGP on AS500 and redistributes OSPF into BGP.

Question 41

Which NETCONF datastore is locked while the network device configuration is edited?

A) running
B) common
C) startup
D) working

Question 42

Refer to the exhibit. Which two configuration leaves in this YANG model are optional? (Choose two.)

A) last-change
B) oper-status
C) type
D) enabled
E) mtu

Question 43

Refer to the exhibit. What is the effect of the script on the device?

A) All interfaces except GigabitEthernet2 are reset to their default configurations.
B) It replaces the entire configuration for GigabitEthernet2 on the device using RESTCONF.
C) It merges the new configuration with the existing configuration on the device using RESTCONF.
D) It compares the configuration to the device. If it matches, the device sends back an HTTP 204 status code.

Question 44

An engineer just completed the installation of Cisco NSO and all of its components. During testing, some of the services are not working properly. To resolve the issue, the engineer started undeploying service instances. What can this cause?

A) It removes the service configuration from the network device only.
B) It removes the service configuration from the network and NSO.
C) It removes the service configuration from NSO only.
D) It runs the service code again when the device is out of sync.

Question 45

Refer to the exhibit. Based on the YANG presented, what is the correct xpath to retrieve the router named "ios-device" under the "CustomerA" service name?

A) /ncs:abc_service/CustomerA/ios-device
B) /abc_service/CustomerA/"ios-device"
C) /ncs:service/abc_service/"CustomerA"/ios-device
D) /ncs:services/abc_service/CustomerA/ios-device

Question 46

Refer to the exhibit. Which command prints out (44, 22) when this code is run on Python 3?

A) print(swap1(d, b))
B) print(swap2(a, b))
C) print(swap1(b, d))
D) print(swap2(22, 44))

Question 47

Refer to the exhibit. A Python script is created to add a new device on Cisco NSO using RESTCONF API. The device is added successfully, but a 405 Method Not Allowed RESTCONF error code has received as the line to fetch SSH keys runs. Which code is missing to complete the script?

A) response = requests.put(baseUriOperation + "/devices/device=ios-device/ssh/fetch-host-keys", auth=auth, headers=headers)
B) response = requests.post(baseUriOperation + "/devices/device=ios-device/ssh/fetch-host-keys", auth=auth, headers=headers)
C) response = requests.post(baseUriOperation + "/devices/device=ios-device/ssh/request-host-keys", auth=auth, headers=headers)
D) response = requests.put(baseUriOperation + "/devices/device=ios-device/ssh/request-host-keys", auth=auth, headers=headers)

Question 48

Refer to the exhibit. When YDK is used to interact with Cisco routers, what is the purpose of passing intf_f into the crud_service.read() method?

A) The Interfaces() class acts as a NETCONF filter, which limits the data returned to that of the openconfig:interfaces YANG model. The Interfaces() class acts as a NETCONF filter, which limits the data returned to that of the openconfig:interfaces YANG model.
B) It provides the data types of the openconfig:interfaces model to the router for dynamic configuration of the interfaces.
C) It locks the interfaces from modification by other active NETCONF sessions.
D) It passes default values into the crud_service , which reconfigures all interfaces to their default configurations. It passes default values into the crud_service , which reconfigures all interfaces to their default configurations.

Question 49

A user is debugging a problem with model-driven dial-in/out streams with gRPC for a Cisco IOS XR implementation. There is no streaming data and the path is not resolved when the show telemetry model-driven subscription command is issued on the router. What is the cause of the problem?

A) The emsd process is not running.
B) There are polling interval problems.
C) SNMP is not enabled.
D) There is no support for IOS XR 64-bit.

Question 50

Refer to the exhibit. Which two URI entries are optional and functional in this RESTCONF URI structure? (Choose two.)

A) fragment
B) query
C) operation
D) api-entry
E) path

Question 51

An engineer needs to configure network devices in an automated way. Which two ways are used to create structured data using YANG to provide REST-like APIs to enable programmability access? (Choose two.)

A) YAML
B) JSON
C) GPB
D) JSON-RPC
E) XML

Question 52

When using Cisco YDK, which syntax configures the BGP ASN using OpenConfig BGP?

A) bgp.config.as_ = 65000
B) bgp.global_.config.as = 65000
C) bgp.global.config.as_ = 65000
D) bgp.global_.config.as_ = 65000

Question 53

Refer to the exhibit. What is the cause of the status of the interface subscription?

A) The router cannot establish a gRPC connection with the collector.
B) The sensor-group "Interface-Counters" does not contain a valid YANG path.
C) The router is waiting for a collector to dial in.
D) This is the expected state of an active subscription.

Question 54

The Netmiko BaseConnection class contains a method called "send_config_set()". Which two actions does this method perform on the device? (Choose two.)

A) It takes a filename parameter that executes commands contained in that file on the device.
B) It requires the user to explicitly send configure terminal and exit commands to the device to enter and exit configuration mode. It requires the user to explicitly send configure terminal and exit commands to the device to enter and exit configuration mode.
C) It automatically enters and exits configuration mode on the device.
D) It takes a Python iterable, such as a list of commands, and executes them in order on the device.
E) It saves the running configuration to the startup configuration after executing the configuration commands on the device.

Question 55

Which two operations must be used to allow a network engineer to use NETCONF to configure and manage networking devices? (Choose two.)

A)
B)
C)
D)
E)

Question 56

Which two data formats are human readable? (Choose two.)

A) YAML
B) Apache Arrow
C) gRPC
D) binary
E) JSON

Question 57

Which statement describes an asynchronous API communication?

A) Asynchronous communication waits for a response.
B) Synchronous communication is with a central orchestrator.
C) It is not necessary to wait for availability of a resource.
D) An application can freeze if there is no response from a request.

Question 58

Refer to the exhibit. An automation engineer has created a RESTCONF POST to configure network devices. Which two tasks are accomplished when the code is executed? (Choose two.)

A) If the specified configuration is already in the running configuration, the command is replaced by this request.
B) If the specified configuration is already in the running configuration, the command is not replaced by this request.
C) If the specified configuration is already executed in the running configuration, the command is merged with this request.
D) If the specified configuration is already in the running configuration, the command updates this request.
E) If the specified configuration is not on the device, the POST request creates it.

Question 59

Which data format should be used to serialize structured data in the most compact way?

A) protobufs
B) YAML
C) JSON
D) XML

Question 60

Refer to the exhibit. Which HTTP authentication mechanism is being used?

A) simple
B) basic
C) OAuth
D) token

Question 61

Refer to the exhibit. Which XML output is a valid instantiation of the YANG model?

A)
B)
C)
D)

Question 62

Refer to the exhibit. What is the significance of "*" before the "father" leaf that is shown in the pyang tree output?

A) It is a node list in a leaf type node.
B) The father leaf is a key in the family list type.
C) The leaf father is read-write in the family list.
D) The node father is read-only in the family list.

Question 63

Which Git command is needed to stage the file network-deploy.py to then commit the changes to the revision history?

A) git init network-deploy.py
B) git add network-deploy.py
C) git merge network-deploy.py
D) git commit network-deploy.py

Question 64

Refer to the exhibit. What must be added after the last line of the Ansible playbook to check if the output contains "IOS-XR"?

A) wait_for: result[1] contains "IOS-XR"
B) wait_for: result[0] contains IOS-XR
C) notify: "IOS-XR"
D) wait_for_connection:

Question 65

Refer to the exhibit. After this operation, what else is needed to change the hostname of the router to IOS-XR-SJC-19?

A)
B)
C)
D)

Question 66

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)

Question 67

What are two benefits of using Cisco NSO? (Choose two.)

A) It abstracts the device adapter and complex device logic from the service logic.
B) It uses load balancing services for better traffic distribution.
C) It easily integrates into northbound systems and APIs.
D) It can replace the CI/CD pipeline tools.
E) It automatically discovers all deployed services.

Question 68

Refer to the exhibit. An engineer updated the skeleton template. How can a device be entered into the YANG Model?

A) Modify the device instance of the device by referencing the acl_lab variable from our YANG model.
B) Deploy a service instance that configures a VLAN of all of the devices present in Cisco NSO.
C) Deploy a service instance that configures a VLAN of a list of devices referenced to the service YANG model.
D) Modify the device instance by referencing the device variable from our YANG model.

Question 69

What is an interior YANG data node that exists in at most one instance in the data tree and has no value?

A) listing node
B) tree node
C) container node
D) leaf node

Question 70

Refer to the exhibit. XTC has been configured by an engineer. What does the IPv4 address represent on the snippet?

A) local address of the router on which it listens for PCEP
B) configured for the local peer for state synchronization
C) destination address of the router on which it listens for PCEP
D) configured for the remote peer for state synchronization

Question 71

Which statement describes the Cisco ESC core engine component?

A) It interacts with the top orchestration layer using the REST and NETCONF/YANG NB APIs.
B) It can be configured for high availability and cluster mode.
C) It performs monitoring based on several monitoring methods.
D) It manages transactions, validations, policies, workflows, VM state machines, and rollbacks.

Question 72

What are two advantages of using Python virtual environments? (Choose two.)

A) They allow for multiple Python projects to use different versions of the same dependency without conflict.
B) They allow multiple Python applications to share virtual memory between subprocesses.
C) They allow for isolated environments where each can use a different version of Python.
D) They allow for all Python projects to utilize the same set of shared dependencies.
E) They allow for multiple virtual machines to share a single Python environment.

Question 73

Which is a format used for the YANG JSON content-type header?

A) application/vnd/yang.data+json
B) application/vnd.yang.data+json
C) application/yang.data.json
D) application/vnd.yang.data json