Nokia Segment Routing

Here you have the best Nokia 4A0-116 practice exam questions

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This questions were last updated on December 16, 2024

Question 1 of 40

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.

Correct Answer: C

An LSP (Label Switched Path) is not a bi-directional tunnel; it is unidirectional. This means data flows in one direction along the path defined by the MPLS labels. Therefore, the statement that an LSP is a bi-directional tunnel is FALSE.

Question 2 of 40

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.

Correct Answer: B

The statement that is false is 'Adjacency-SID values are taken from the SRGB configured for the routing protocol.' By default, Adjacency-SIDs are allocated from the dynamic label range and are non-persistent, meaning they are not taken from the configured Segment Routing Global Block (SRGB).

Question 3 of 40

Which of the following statements about Segment Routing is FALSE?

No path signaling is required to establish an SR tunnel.

Intermediate routers do not maintain any tunnel information.

A link-state IGP is required to distribute SID information.

For TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.

Correct Answer: D

Segment Routing (SR) uses a list of segments to define the path that a packet should follow through the network. This means that for Traffic Engineering (TE)-constrained tunnels, each data packet usually carries a stack of MPLS labels, not just a single MPLS label, to specify the tunnel path. Therefore, the statement that each data packet typically carries a single MPLS label for TE-constrained tunnels is false.

Question 4 of 40

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

A local Node-SID can be configured directly as an MPLS label.

A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.

All routers do NOT need to have the same SRGB range configured.

A local Node-SID can be configured as an index.

Correct Answer: B

A router advertises its local Node-SID as a local SRGB and an index regardless of whether it is configured as an index or as an MPLS label. The false statement among the options is that a router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index. This is because the advertisement happens irrespective of the configuration as an index.

Question 5 of 40

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?

Value 1 - Traffic Engineering

Value 4 - Router Info

Value 7 - SRGB Range

Value 8 - Extended Link Info

Correct Answer: C

When OSPF is used to support Segment Routing, the first byte of the link-state ID associated with each of the opaque LSAs indeed indicates the type of information being advertised. Here is the correct information: Value 1 represents Traffic Engineering, Value 4 represents Router Info, Value 7 represents Extended Prefix Info, and Value 8 represents Extended Link Info. Therefore, the false statement is that Value 7 is associated with SRGB Range; it should be Extended Prefix Info.