Latest [Apr 30, 2023] Real Nokia 4A0-116 Exam Dumps Questions [Q21-Q39]

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Latest [Apr 30, 2023] Real Nokia 4A0-116 Exam Dumps Questions

4A0-116 Dumps To Pass Nokia Service Routing Architect Exam in One Day (Updated 42 Questions)

问题 21
Based on the exhibit, which of the following is a viable option for the Path Computation Element (PCE) to obtain all the necessary topology and traffic-engineering information from the network, so that it can calculate LSP paths on behalf of the PE routers?

Establishing an IGP adjacency with router R2

Establishing IGP adjacencies with routers R1 and R2

Establishing a BGP session using the BGP-LS address family with router R3

Establishing BGP sessions using the BGP-LS address family with routers R3 and R4

问题 22
OSPF type-10 Opaque LSAs can carry different types of advertisements. What type of advertisement carries a router’s local 5RGB information?

Extended Prefix Info

Router Info

Extended Link Info

Traffic Engineering Info

This type of advertisement carries a router’s local SRGB information, which is used to distribute information about the local SID allocation range

问题 23
Which of the following statements about a Segment Routing SID is FALSE?

A Node-SID is usually associated with a router’s system interface.

Adjacency-SID values are taken from the SRGB configured for the routing protocol.

A Prefix-SID can be configured directly as a label value or indirectly as an index.

An Adjacency-SID does not have to be configured.

An Adjacency-SID does not have to be configured: this statement is not true, An Adjacency-SID is associated with a neighbor router, it is used to identify an adjacency between two routers. An Adjacency-SID must be configured to identify the adjacency.

问题 24
Which of the following is NOT one of the main goals of traffic engineering?

Utilizing redundant links.

Avoiding potential congestion points in the network.

Defining traffic paths based on various constraints.

Using the shortest possible path through the network to the destination.

问题 25
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?

The IGP link-state database

The traffic-engineering database

The operational state of existing LSP paths

The amount of bandwidth reserved for each of the existing LSP paths

问题 26
Which of the following statements about path definitions is FALSE?

Once a path is associated with an LSP, it cannot be used by other LSPs.

A loose hop is one that does not have to be directly adjacent to the previous hop in the path list

The path hops can be defined by either the system or physical interface IP address.

In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.

问题 27
Which of the following list of SR-TE attributes has to be advertised among routers?

Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to.

Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to.

Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to, link status up/down.

Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to, link status up/down.

In SR-TE, routers need to advertise certain attributes of their links to other routers in the network in order to calculate traffic-engineered paths. These attributes include:
Administrative groups that each link belongs to: This information is used to restrict the use of certain links to specific traffic types or groups.
TE metric of links: This information is used to calculate the cost of using a particular link for a traffic-engineered path.
Bandwidth availability of each link: This information is used to control the amount of traffic that can be sent over a particular link.
SRLG that each link belongs to: This information is used to avoid routing over the same physical link. Link status up/down is not needed to be advertised as it is part of the IGP protocol and is used to check the reachability of a link.

问题 28
Based on the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE?

Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.

Only standard LFA is enabled on both routers R1 and R2.

Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.

Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.

问题 29
Loopfree-alternate has been enabled on a router for its link-state routing protocol. For which types of segments will the router attempt to find a backup path, so that they become protected by fast re-route?

Only segments defined by a Node-SID.

Only segments defined by an Adjacency-SID.

Segments defined by a Node-SID and segments defined by an Adjacency-SID.

No segments, unless segment-routing fast-reroute is also explicitly enabled.

Loopfree-alternate is a mechanism that enables fast re-route for link-state routing protocols, it allows the router to find a backup path for both Node-SID and Adjacency-SID segments, so that they become protected by fast re-route.

问题 30
The exhibit shows the fast re-route configuration on router R1, in which both R-LFA and TI-LFA have been enabled. Assume that there are multiple potential backup paths for a given prefix. Which of the following options will router R1 use?

A standard LFA path that would not coincide with the path after IGP re-convergence.

An R-LFA path that would not coincide with the path after IGP re-convergence.

A D-LFA path that would not coincide with the path after IGP re-convergence.

A D-LFA path that would coincide with the path after IGP re-convergence.

The exhibit shows that both R-LFA and TI-LFA have been enabled on router R1. R-LFA (Remote Loop-Free Alternate) is a method that is used to protect the active segment of a tunnel, and it allows the router to find a backup path that coincides with the path that will become active after IGP reconvergence. TI-LFA (Topology Independent LFA) is a method that is used to protect an end-to-end multi-segment tunnel, it allows the router to find a backup path that does not rely on the IGP topology, but on the segment routing topology.
With R-LFA and TI-LFA enabled, router R1 will use a D-LFA (Dual-Loop-Free Alternate) path, which is a combination of both R-LFA and TI-LFA, this path will coincide with the path after IGP re-convergence.
A standard LFA, R-LFA, and D-LFA which do not coincide with the path after IGP re-convergence are not the options.

问题 31
For any of the LFA methods to work properly, there must be a router in the backup path that will forward traffic addressed to the destination without sending it back to the source. Which of the following statements describes the way R-LFA selects such a router?

It selects an immediate neighbor.

It selects a remote router, reachable through a tunnel defined by a single Node-SID.

It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.

It can select an immediate neighbor or a remote router, as long as the backup path coincides with the path that will become active after IGP reconvergence.

R-LFA (Remote Loop-Free Alternate) is a method that can select either an immediate neighbor or a remote router to be used as a backup next hop, as long as the backup path coincides with the path that will become active after IGP reconvergence.

问题 32
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?

Using a flex-algo Node-SID as an explicit hop in the path definition of an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.

Specifying the flex-algo instance ID as an additional TE constraint for an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.

Configuring and applying a VRF import policy to a VPRN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.

Configuring and applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.

Applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service is not a valid option for steering traffic into a flex-algo segment-routing tunnel, VSI is not related to flex-algo SR.

问题 33
Which of the following statements about Multi-Protocol Label Switching networks is FALSE?

MPLS uses a signaling protocol to exchange labels between routers.

An LSR forwards data based on the MPLS labels.

An LSP is a bi-directional tunnel that uses MPLS labels to forward data.

The data is transparently carried from end to end.

The data is transparently carried from end to end: This statement is not true, MPLS does not provide data transparency, which means that the data is not carried unmodified from end to end. MPLS uses labels to forward data, so the original IP packets are encapsulated in new MPLS packets, and the original IP headers are not visible at the egress LSR.

问题 34
An SR-TE LSP with a path definition that includes router R4 as a loose hop and for which Seamless-BFD has been enabled is following the path shown in the exhibit. What happens after router R4 fails if the routers along the path follow the default behavior?

The head end will periodically try to calculate a new path at a rate defined by the retry timer.

The head end will periodically try to calculate a new path at a rate defined by the resignal timer.

The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.

The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.

When an SR-TE LSP with Seamless-BFD enabled, the BFD sessions are established between the routers along the path to detect any failures quickly. If a failure happens in the path, the router will stop forwarding the traffic and send a BFD control packet to the head-end router. In this case, R4 failed, BFD sessions will detect the failure and send a message to the head-end router, but since R4 is a loose hop, the path doesn’t have to be re-calculate. The head-end router will continue forwarding traffic to the current next-hop, R2, which will be discarded at the point of failure (R4) as it doesn’t know about the failure. And the traffic will not be redirected to R3 after IGP reconvergence.

问题 35
A router participating in SR-TE is advertising a value of Ox11 for the admin-group membership of one of its interfaces. Which of the following statements is TRUE?

The interface belongs to admin group RED, configured with a value of 17.

The interface belongs to two different admin groups.

The interface belongs to three different admin groups.

The interface belongs to four different admin groups.

In SR-TE, the admin-group is represented by a 32-bit value, where each bit represents a different admin-group. The value Ox11 in binary is 000100010001, which has two bits set to 1, indicating that the interface belongs to two different admin groups. The exact admin-groups that the interface belongs to depends on how the admin-groups have been configured on the router.

问题 36
Based upon the exhibit, which of the following statements regarding the configuration is FALSE?