Segment routing 2.0

Question 1

What problem does the mapping agent solve?

Answer 1

SR nodes will not have SIDs for LDP-only nodes, but LDP will have labels for SR-only nodes.

Question 2

For IS-IS, the mapping server advertisements are currently propagated between levels.

Answer 2

False

Question 3

For multilevel IS-IS networks, a mapping server for each IS-IS area is currently required.

Answer 3

True

Question 4

For OSPF, the mapping server advertisements are propagated between areas.

Answer 4

True

Question 5

Mapping server configuration: 10.1.1.1/32 10 range 200

Answer 5

A range of 200 mappings for a prefix range starting at 10.1.1.1/32, with the prefix-SID range starting at index 10. As you see on the right, this will result in prefix 10.1.1.1/32 being mapped to prefix-SID index 10, 10.1.1.2/32 mapped to prefix-SID index 11, and so on, until prefix 10.1.1.200/32 is mapped to prefix-SID index 209.

Question 6

The mapping server configuration also requires the client functionality to be enabled, which is not done by default for more recent software releases.

Answer 6

False, it is enabled by default.

Question 7

What is the result of the configuration below? 20.1.0.0/24 400 range 300

Answer 7

20.1.0.0/24 - 16400? up to 20.2.44.0/24 - 16699?

Question 8

The P space is the set of nodes that are reachable from node S, the point of local repair (PLR), without using the protected link L.

Answer 8

True

Question 9

The Q space is the set of nodes that are reachable from node S, the point of local repair (PLR), without using the protected link L.

Answer 9

False

Question 10

The extended P space is the combination of the P spaces of all neighbors of S.

Answer 10

True

Question 11

The Q space is the set of nodes that can reach destination D without crossing the protected link L.

Answer 11

True

Question 12

The Q space is the set of nodes that can reach Source S without crossing the protected link L.

Answer 12

False

Question 13

In which of the topologies below is the node SID used to reach the P node?

Answer 13

Single segment

Question 14

In which of the topologies below is the adj SID used to reach the Q node?

Answer 14

Double segment

Question 15

TI-LFA protection uses the SR/LDP interworking functionality. SR/LDP interworking is also applied to the backup path. This means that nodes on the backup path must all be SR-capable.

Answer 15

False. This means that nodes on the backup path must not all be SR-capable.

Question 16

The benefit is that TI-LFA provides 100-percent coverage without using targeted LDP sessions.

Answer 16

True

Question 17

SRv6 Header

Answer 17

Segment Routing Header (SRH)

Question 18

Fields of the SRv6 header: ________ ________: index, in the Segment List, of the current active segment in the SRH. Decremented at each segment endpoint. It is a list of 128-bit IPv6 addresses representing each segment of the path.

Answer 18

Segments Left

Question 19

SRH behavior and processing depends on the type and capability of the node:

Answer 19

Source node, Transit node

Question 20

In SRv6, SR and non-SR nodes can coexist.

Answer 20

True

Question 21

What are the two redundancy modes of PCE?

Answer 21

PCC-centric, PCE-centric

Question 22

In PCE-centric mode, the delegate bit is controlled by the PCC.

Answer 22

False, it is controlled by the PCE.

Question 23

In PCC-centric mode, the delegate bit is controlled by the headend.

Answer 23

True

Question 24

What is the default PCE redundancy mode?

Answer 24

PCE-centric

Question 25

What parameter is used in the PCE configuration for the PCC to report the configured policies?

Answer 25

Report-all