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Nokia 4A0-116 Exam Syllabus Topics:

Topic	Details
Topic 1	Configuring segment routing LSPs with traffic engineering constraints Configuring IS-IS to advertise TE information
Topic 2	Link-state routing protocol extensions to support traffic engineering Configuring OSPF to advertise TE information
Topic 3	Advertisement of flex-algo information by OSPF Flexible algorithm configuration Flexible algorithm basics
Topic 4	Differences between segment routing and other traditional MPLS label signaling protocols MPLS data encapsulation and forwarding
Topic 5	Segment routing tunnels with traffic engineering constraints Enabling traffic engineering
Topic 6	Using segment routing tunnels with TE constraints (SR-TE) Label stack reduction for CSPF-calculated paths
Topic 7	Link-state routing protocol extensions to support segment routing Configuring OSPF to support segment routing

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Nokia Segment Routing Exam Sample Questions (Q33-Q38):

NEW QUESTION # 33
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?

• A. Segments defined by a Node-SID and segments defined by an Adjacency-SID.
• B. No segments, unless segment-routing fast-reroute is also explicitly enabled.
• C. Only segments defined by a Node-SID.
• D. Only segments defined by an Adjacency-SID.

Answer: A Explanation:
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.
NEW QUESTION # 34
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?

• A. R1, R2, R4 and R6
• B. R1, R3, R2, R5, R4 and R6
• C. R1, R3, R4 and R6
• D. R1, R2, R5 and R6

Answer: C
NEW QUESTION # 35
Which of the following statements about the operation of seamless-BFD is FALSE?

• A. A seamless-BFD template needs to be configured on the head-end of the LSP.
• B. To be able to respond to seamless-BFD messages, a router must be configured as a reflector.
• C. Seamless-BFD responses are sent back using the LSP label stack.
• D. The routing protocol (OSPF or IS-IS) is used to carry the reflector discriminator information.

Answer: C Explanation:
Seamless-BFD is a mechanism that allows the detection of faults in MPLS LSPs more quickly by using BFD (Bidirectional Forwarding Detection) protocol. Seamless-BFD responses are sent back using the MPLS data-plane, not the LSP label stack.
NEW QUESTION # 36
When OSPF is used to support Segment Routing, the first byte of the link-state ID associated with each of the opaque LSAs indicates the type of information being advertised. Which of the following associations between the first-byte value and its meaning is FALSE?

• A. Value 8 - Extended Link Info
• B. Value 4 - Router Info
• C. Value 1 - Traffic Engineering
• D. Value 7 - SRGB Range

Answer: A Explanation:
Value 8 - Extended Link Info: This statement is not true, value 8 is not used to indicate Extended Link Info. It is used for different types of information, such as Link-Local/Remote Identifiers (LLS/RLS) Identifiers and Node SID/Adj-SID.
NEW QUESTION # 37
Which of the following list of SR-TE attributes has to be advertised among routers?

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

Answer: B Explanation:
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.
NEW QUESTION # 38
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