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Segment Routing Flashcards

1
Q

A Prefix-SID can only be associated with a single prefix.

A Prefix-SID can be assigned to any prefix, not just a /32 or /128 host prefix.

A

true

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2
Q

A operação SR continue é equivalente a operação mpls PoP

A

False, Continue = Swap

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3
Q

SR Operation:

Active segment is finished, next segment become active

A

true

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4
Q

Node SID is not a prefix SID

A

false

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5
Q

Node SID is a prefix SID with N flag, it must be /32 or /128a

A

true

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6
Q

Anycast SID is a prefix SID with N flag

A

false

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7
Q

Qual tipo de SID pode ser utilizado para steer traffic para um LAG

A

L2 Adjacency SID

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8
Q

A layer 2 Adjacency- SID can be used to:
- Send traffic over a specific interface of an EtherChannel, even if only one IGP adjacency is formed over that EtherChannel

A

True

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9
Q

Wich SID is used in cases whereby there are multiple adjacencies between nodes that are not bundled together using a LAG protocol, but you still wish to group ports together.

A

group adj segment

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10
Q

__________ specify a group of neighbors, the resulting instruction of which is to ECMP towards those neighbors.

A

BGP Peer Set Segments

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11
Q

_________ specify a path or link to a specific neighbor and is signalled using BGP Link State.

A

BGP Peer Adjacency Segment

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12
Q

NO SRv6

SR and non-SR nodes can co-exist

A

verdadeiro

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13
Q

Complete:

__________ nodes:

Plain IPv6 forwarding is used.

Solely based on IPv6 destination address.

No SRH inspection or update is possible.

Transparent and interoperable with legacy non-SR-capable nodes.

A

Non-SR transit

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14
Q

The _________ is a range of label values preserved for the manual allocation of adjacency segment identifiers (adj-SIDs)

The default SRLB range is from ______ to _____

A

Segment Routing Local Block (SRLB)

15000 to 15999

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15
Q

The SRGB is advertised in the IS-IS _____ Capabilities TLV.

The SR Capabilities sub-TLV is included in the _____ Capabilities TLV

A

Router for both

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16
Q

The flags in the SR-Capabilities sub-TLV are as follows:

___: IPv4; if set, the router is capable of outgoing IPv4 encapsulation on all interfaces.

___ : IPv6; if set, the router is capable of outgoing IPv6 encapsulation on all interfaces.

A

I, V

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17
Q

Na saída do sh isis database verbose o que indicam as flags abaixo:

X:0 R:0 N:1

A

prefixo é node sid

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18
Q

O que as flags abaixo apontam ?

Router Cap: 10.0.255.5 D:0 S:0
Segment Routing: I:1 V:0, SRGB Base: 16000 Range: 8000

A

SID apenas para ipv4

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19
Q

Qual comando OSPF exibe as capabilities do router

A

show ospf database opaque-area 4.0.0.0 self-originate

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20
Q

OSPF SR:

Qual comando exibe informações no database relacionadas a SR ?

A

show ospf database opaque-area

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21
Q

Aponte dentre as entradas abaixo quais são referentes a prefix sid:

            Type-10 Opaque Link Area Link States (Area 0)

Link ID ADV Router

  1. 0.0.0 10.0.255.5
  2. 0.0.8 10.0.255.5
  3. 0.0.0 10.0.255.5
  4. 0.0.1 10.0.255.5
  5. 0.0.2 10.0.255.5
  6. 0.0.8 10.0.255.5
A

Todas as que iniciam com 7.x.x.x.x
ext-prefix Extended Prefix LSA
show ospf database opaque-area ext-prefix

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22
Q

Aponte dentre as entradas abaixo quais são referentes a capacidades do router:

            Type-10 Opaque Link Area Link States (Area 0)

Link ID ADV Router

  1. 0.0.0 10.0.255.3
  2. 0.0.5 10.0.255.3
  3. 0.0.7 10.0.255.3
  4. 0.0.0 10.0.255.3
  5. 0.0.1 10.0.255.3
  6. 0.0.5 10.0.255.3
  7. 0.0.7 10.0.255.3
A

4.0.0.0
router-info Router Information LSA
show ospf database opaque-area router-info

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23
Q

Aponte dentre as entradas abaixo quais são referentes a links de transito:

            Type-10 Opaque Link Area Link States (Area 0)

Link ID ADV Router

  1. 0.0.0 10.0.255.3
  2. 0.0.5 10.0.255.3
  3. 0.0.7 10.0.255.3
  4. 0.0.0 10.0.255.3
  5. 0.0.1 10.0.255.3
  6. 0.0.5 10.0.255.3
  7. 0.0.7 10.0.255.3
A

8.x.x.x.x
ext-link Extended Link LSA
show ospf database opaque-area ext-link

24
Q

Quais comandos para configurar o segment routing no OSPF?

A

segment-routing

router ospf 10
 segment-routing mpls
 segment-routing forwarding mpls
 address-family ipv4 unicast
 area 0
  interface Loopback0
   prefix-sid index 5
25
Q

Como um BGP prefix sid é associado a um prefixo ?

A

Via route-policy

route-policy SET-SID
set label-index 11
end-policy

26
Q

Multiple IP-to-MPLS entries (LDP and SR) for the same prefix path can coexist.

A

falso, it cannot

27
Q

If an unlabeled packet with destination 1.1.1.5 arrives on node 1, which label should be pushed? Both SR and LDP labels lead toward the node-originating prefix 1.1.1.5, which is node 5. By default, node 1 imposes the ___ label.

28
Q

In Segment routing incoming labels must be unique

29
Q

O Mapping agent anuncia labels LDP para nodes SR Capable

A

False, é o inverso.

30
Q

O Mapping agent anuncia SID SR para nodes em nome de Nodes LDP

31
Q

Qual problema resolve o mapping agent ?

A

SR Nodes não possuirão Sids para nodes LDP only, porém LDP possuirão labels para nodes SR Only.

32
Q

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

33
Q

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

34
Q

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

35
Q

Configuração do mapping server

10.1.1.1/32 10 range 200

A range of 200 mappings for a prefix range starting at 10.1.1.1/32, with the prefix-SID range starting at index __. As you see on the right, this will result in prefix 10.1.1.1/32 being mapped to prefix-SID index __, 10.1.1.1.2/32 mapped to prefix-SID index __, and so on, until prefix 10.1.1.200/32 is mapped to prefix-SID index____

A

index 10, 10 e 11, 209

36
Q

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

A

false, it is enable by default

37
Q

Qual resultado da configuração abaixo ?

20.1.0.0/24 400 range 300

A

20.1.0.0/24 - 16400 ?
até
20.2.44.0/24 - 16699 ?

38
Q

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

39
Q

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

40
Q

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

41
Q

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

42
Q

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

43
Q

Em qual das topologias abaixo é usado o node sid para alcançar o P node ?

Zero segment
single segment
Double segment

44
Q

Em qual das topologias abaixo é usado o adj sid para alcançar o Q node ?

Zero segment
single segment
Double segment

45
Q

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

A

False

[…]
This means that nodes on the backup path must not all be SR-capable

46
Q

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

47
Q

Header SRv6

A

Segment Routing Header (SRH)

48
Q

Campos do header SRv6
________ ________ : 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.

A

Segments Left

49
Q

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

A

Source node

Transit node:

50
Q

No SRv6 SR and non-SR nodes can co-exist

51
Q

Quais os dois modos de redundância PCE ?

A

Pcc centric

Pce centric

52
Q

No modo pce centric o delegate bit é controlado pelo pcc

A

Falso, pelo pce

53
Q

No pcc centric mode o delegate bit é dontrolado pelo headend

A

Verdadeiro

54
Q

Qual modo de redundancia PCE default?

A

Pce centric

55
Q

Qual parametro usado na conficuracak do pce para que o pcc reporte as policies configuradas ?

A

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CCNP SP (24 decks)

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