Implementing and Operating Cisco Service Provider Network Core Technologies

Here you have the best Cisco SPCOR practice exam questions

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This questions were last updated on May 25, 2025
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Question 1 of 371

DRAG DROP -

Drag and drop the OSs from the left onto the correct descriptions on the right.

Select and Place:

Correct Answer:

Reference:

https://specialties.bayt.com/en/specialties/q/276369/what-is-the-key-difference-between-ios-ios-xe-and-ios-xr-for-cisco-devices/

Question 2 of 371

Refer to the exhibit. P3 and PE4 are at the edge of the service provider core and serve as ABR routers. Aggregation areas are on either side of the core.

Which statement about the architecture is true?

To support seamless MPLS, the BGP route reflector feature must be disabled.

If each area is running its own IGP, BGP must provide an end-to-end MPLS LSP.

If each area is running its own IGP, the ABR routers must redistribute the IGP routing table into BGP.

To support seamless MPLS, TDP must be used as the label protocol.

Correct Answer: B

If each area in a network architecture is running its own Interior Gateway Protocol (IGP), Border Gateway Protocol (BGP) must be utilized to provide an end-to-end Multiprotocol Label Switching (MPLS) Label Switched Path (LSP). BGP is necessary to interconnect different areas and ensure continuous MPLS forwarding across them, as each IGP domain would not inherently understand the MPLS labels from other areas. Thus, BGP plays a crucial role in facilitating seamless MPLS by providing the necessary LSPs that span different IGP areas.

Question 3 of 371

Which component is similar to an EVPN instance?

router distinguisher

MPLS label

IGP router ID

VRF

Correct Answer: D

An EVPN instance (EVI) is conceptually similar to a Virtual Routing and Forwarding (VRF) instance. Both are used to segment networks in a similar way. An EVI represents a specific VPN instance on a Provider Edge (PE) router, serving the same role as a VRF, which is also used to create isolated routing instances in a network.

Question 4 of 371

Why do Cisco MPLS TE tunnels require a link-state routing protocol?

The link-state database provides segmentation by area, which improves the path-selection process.

The link-state database provides a data repository from which the tunnel endpoints can dynamically select a source ID.

Link-state routing protocols use SPF calculations that the tunnel endpoints leverage to implement the tunnel.

The tunnel endpoints use the link-state database to evaluate the entire topology and determine the best path.

Correct Answer: D

Cisco MPLS TE tunnels require a link-state routing protocol because the tunnel endpoints use the link-state database to evaluate the entire topology and determine the best path. Link-state protocols provide comprehensive information about the network's topology, which is essential for determining optimal routing paths for traffic engineering. This capability is crucial for the efficient implementation of MPLS TE tunnels, as it allows for better path calculation and network resource management.

Question 5 of 371

Refer to the exhibit. BGPsec is implemented on R1, R2, R3, and R4. BGP peering is established between neighboring autonomous systems.

Which statement about implementation is true?

BGP updates from the iBGP peers are appended with a community of local-as.

BGP updates from the all BGP peers are appended with a community of no-export.

BGP updates from the eBGP peers are appended with an additional AS path value that is statically set by the domain administrator.

BGP updates from the eBGP peers are appended with a BGPsec attribute sequence that includes a public key hash and digital signature.

Correct Answer: D

BGPsec is designed to provide security for BGP updates by ensuring the authenticity and integrity of the AS path information. When BGPsec is implemented, BGP updates from eBGP peers include a BGPsec attribute sequence. This sequence contains a digital signature and a public key hash, which verifies the legitimacy of the origin and sequence of the AS path. This ensures that each hop in the path is validated using cryptographic methods, preventing route hijacking and other malicious activities.