Question 1
Which statement about Network Services Orchestrator (NSO) is true?
- A. It is used only in service provider environments
- B. It can be used only with XML coding
- C. It uses YANG modeling language to automate devices
- D. It must use SDN as an overlay for addressing
Answer:
C
Explanation:
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Network Services Orchestrator (NSO) uses the YANG (Yet Another Next Generation) modeling language to provide a
standardized way to automate network devices. YANG provides a powerful schema to model configuration and state data
for network elements, which NSO leverages for service automation and orchestration.
Reference: Cisco Crosswork Network Services Orchestrator (NSO) - Cisco2
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Question 2
Which task must be performed first to Implement BFD in an IS-IS environment?
- A. Disable Cisco Express Forward.ng on all interfaces running routing protocols other than IS-IS
- B. Configure BFD under the IS-IS process
- C. Configure all ISIS routers as Level 2 devices
- D. Configure BFD in an interface configuration mode
Answer:
D
Explanation:
To implement Bidirectional Forwarding Detection (BFD) in an IS-IS environment, the first task is to configure BFD in an
interface configuration mode. This involves setting up BFD parameters on the interfaces where IS-IS is running to enable
quick failure detection.
Reference: Implementing BFD in an IS-IS Environment - Exam-Answer3
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Question 3
An engineer working for telecommunication company with an employee id: 3715 15 021 needs to secure the LAN network
using a prefix list Which best practice should the engineer follow when he implements a prefix list?
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- A. An engineer must use non sequential sequence numbers in the prefix list so that he can insert additional entries later.
- B. The final entry in a prefix list must be /32
- C. An engineer must identity the prefix list with a number only
- D. An engineer must include only the prefixes for which he needs to log activity.
Answer:
A
Explanation:
When implementing a prefix list, it is a best practice to use nonsequential sequence numbers. This allows for the insertion
of additional entries at a later time without the need to renumber the entire list, providing flexibility in managing the prefix
list.
Reference: Best Practices for Implementing a Prefix List - exam-answer.com4
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Question 4
Refer to the exhibit:
A network operator working for service provider with an employee id 3715 15:021 applied this configuration to a router.
Which additional step should the engineer use to enable LDP?
- A. Disable Cisco Express Forwarding globally
- B. Delete the static router ID
- C. Enable MPLS LDP on the interface
- D. Configure the both keyword to enable LDP globally http://www.justcerts.com P-
Answer:
C
Explanation:
The configuration snippet shows that MPLS and LDP are configured globally but not enabled on an interface. The
commands include “mpls label protocol ldp,” “mpls ldp router-id loopback 0,” and “mpls ip,” which are necessary for global
settings. However, to establish LDP neighbors and exchange labels, LDP must be enabled on the specific interface where it’s
needed.
Reference:
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR)
Cisco SPCOR Training resources available on the Cisco Learning Network Store.
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Question 5
Which configuration mode do you use to apply the mpls Idp graceful-restart command in IOS XE Software? MPLS
- A. MPLS
- B. LDP neighbor
- C. global
- D. interface
Answer:
C
Explanation:
The mpls ldp graceful-restart command is applied in the global configuration mode in IOS XE Software.
This command
enables MPLS LDP Graceful Restart, which assists a neighboring router with MPLS LDP Stateful Switchover/Nonstop
Forwarding (SSO/NSF) Support and Graceful Restart to recover gracefully from an interruption in service without losing its
MPLS forwarding state1
.
Reference: MPLS Configuration Guide, Cisco IOS XE 17.x1
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Question 6
Which statement describes the advantage of a Multi-Layer control plane?
- A. It automatically provisions monitors, and manages traffic across Layer 0 to Layer 3
- B. It minimizes human error configuring converged networks
- C. It supports dynamic wavelength restoration in Layer 0
- D. It provides multivendor configuration capabilities for Layer 3 to Layer 1
Answer:
A
Explanation:
A Multi-Layer control plane, like Cisco’s nLight technology, provides an integrated approach that allows for the automatic
provisioning, monitoring, and management of traffic across different network layers, from Layer 0 (optical) to Layer 3
(IP).
This integration increases network agility and flexibility while improving network utilization, leading to significant cost
savings and more efficient network resiliency solutions2
.
Reference: The Economics of Cisco’s nLight Multilayer Control Plane Architecture2
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Question 7
Refer to the exhibit:
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Which statement about the status of the neighbor relationship between R1 and R2 is true?
- A. The neighbor relationship is down because the two routers are configured with different area types
- B. The neighbor relationship is down because the two routers are in the same subnet.
- C. The neighbor relationship is up because R2 is level 1 and level 2 router.
- D. The neighbor relationship is down because R2 is operating as a Level 1 router and the two routers are in different area
Answer:
D
Explanation:
The neighbor relationship is down because R2 is operating as a Level 1 router and the two routers are in different areas. In
the IS-IS (Intermediate System to Intermediate System) protocol, Level 1 routers exchange routing information with other
Level 1 routers in the same area, while Level 2 routers exchange information between areas. Since R1 is configured as a
level-2 router and R2 as a level-1 router, they cannot form a neighbor relationship if they are not in the same
area. Reference: Implementing and Operating Cisco Service Provider Network Core Technologies source documents or
study guide
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Question 8
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Refer to the exhibit:
A network engineer is implementing a BGP protocol. Which effect of the local-as keyword in this configuration is true?
- A. It enables peer 192.168.1.2 to establish a BGP relationship with R1 using AS 65012 and the VPNv4 address family
- B. It enables peer 192.168.1.2 to establish a BGP relationship with R1 using AS 65012 without additional configuration
- C. It enables peer 192.168.1.2 to establish a BGP relationship with R1 using AS 65112 and the VPNv4 address family
- D. It enables peer 192.168.1.2 to establish a BGP relationship with R1 using AS 65112 without additional configuration.
Answer:
D
Explanation:
The local-as keyword is used in BGP configurations to change the local AS number that is used in the BGP OPEN message
when establishing a BGP session with a specific neighbor. In this case, even though the router is configured with AS 65000,
it will use AS 65112 when establishing a connection with neighbor 192.168.1.2 due to the local-as keyword
configuration. Reference :=
Cisco
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13761-39.html
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Question 9
Refer to the exhibit:
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Which condition must be met by the OSPF peer of router R1 before the two devices can establish communication?
- A. The interface on the OSPF peer must use the same key ID and key value as the configured interface
- B. The interface on the OSPF peer may have a different key ID, but it must use the same key value as the configured interface
- C. The OSPF peer must be configured as an OSPF stub router
- D. The OSPF peer must use clear-text authentication
Answer:
A
Explanation:
In OSPF, for two routers to establish communication, they must have the same key ID and key value on their interfaces. This
ensures secure communication between the OSPF peers. The key ID and value are part of the OSPF authentication
mechanism that helps in validating the identity of OSPF peers before exchanging routing information. Reference:
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) -
Cisco SPCOR Training &
Certification
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Question 10
Refer to the exhibit:
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Which statement about the neighbor statements for 192.168.1.1 is true?
- A. The router must have TDP configured for the send-label command to operate
- B. The neighbor router receives at least four labels from this router
- C. The router sends BGP labels for its prefixes to this peer
- D. The router sends only a label for the prefix for LoopbackO.
Answer:
C
Explanation:
In OSPF, for two routers to establish communication, they must have the same key ID and key value on their interfaces. This
ensures secure communication between the OSPF peers. The key ID and value are part of the OSPF authentication
mechanism that helps in validating the identity of OSPF peers before exchanging routing information. Reference:
Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) -
Cisco SPCOR Training &
Certification
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