Segment Routing at Scale for Service Providers

1. In a large-scale SR deployment, how does stateless forwarding reduce operational complexity?

Routers only forward based on segment stack without maintaining LSP state

Eliminates the need for routing protocols entirely

Reduces the number of routing table entries

Simplifies BGP confederation setup

Submit

3. Which of the following is a key operational challenge when deploying SR at scale?

Ensuring consistent SRGB allocation and SID management across all nodes

Maintaining LDP adjacencies on every link

Configuring RSVP-TE reservations manually

Distributing BGP communities to all routers

Submit

5. In a multi-domain SR network, how does BGP-LS facilitate inter-domain path computation?

BGP-LS advertises topology and SID information across domain boundaries to PCE

BGP-LS replaces all IGP routing protocols

BGP-LS enables direct packet forwarding without PCE involvement

BGP-LS automatically creates backup tunnels

6. What does the S-bit in an SRv6 SID indicate?

The segment is a static route entry

The segment is a static allocation or dynamic allocation

The segment requires BGP signaling

The segment supports multicast forwarding

7. In SR deployments at scale, what is the primary benefit of centralizing path computation?

PCE can optimize paths globally and reduce network congestion

Eliminates the need for any routing protocol

Automatically enables multicast across all domains

Reduces CPU usage on all routers uniformly

8. Which routing protocol must be enabled to advertise node SIDs in an SR-MPLS network?

IS-IS or OSPF with SR extensions

BGP-LS exclusively

LDP with RSVP signaling

RIP version 2

Submit

10. What is a Binding SID (BSID) used for in SR-TE?

To encapsulate a complex segment list into a single SID for simplified forwarding

To mark packets for DSCP-based QoS

To identify the source of a BGP route

To enable multicast replication at core routers

11. What is the primary advantage of Segment Routing over traditional MPLS in terms of state management?

SR eliminates the need for per-flow state at core routers

SR reduces routing protocol convergence time

SR improves BGP route reflection efficiency

SR simplifies OSPF area configuration

12. What is the purpose of the Segment Routing Global Block (SRGB) in an SR network?

To define the range of label values reserved for node and adjacency SIDs

To store BGP route reflector policies

To configure OSPF area numbering

To manage BGP AS path filtering

13. Which statement is true about Segment Routing and ECMP (Equal-Cost Multipath)?

SR inherently disables ECMP for traffic engineering paths

SR-TE paths can coexist with ECMP for non-TE traffic

ECMP is replaced entirely by segment routing

SR requires manual ECMP configuration on each node

Submit

15. What is the primary role of BGP-LS in an SR deployment?

To advertise network topology and segment identifiers to PCE

To establish MPLS LSP tunnels between routers

To provide backup path computation

To enable multicast forwarding in SR domains

16. Which of the following best describes Segment Routing Traffic Engineering (SR-TE)?

A method to steer traffic along explicit paths using segment lists

An extension of BGP for multipath routing

A protocol for QoS marking in MPLS networks

A technique to reduce BGP table size

Submit

18. What is the maximum segment identifier (SID) value in MPLS SR?

65,535

1,048,575

16,777,215

4,294,967,295

19. Which protocol is used by a Path Computation Engine (PCE) to communicate with routers in an SR domain?

BGP-LS and PCEP

IS-IS and OSPF

LDP and RSVP-TE

BFD and VRRP

20. In SR-MPLS, what does a node segment represent?

A specific interface on a router

A path to reach a particular node via shortest path

A link-local adjacency identifier

A BGP community value

CCIE Service Provider Segment Routing at Scale Quiz

1. In a large-scale SR deployment, how does stateless forwarding reduce operational complexity?

2.

What first name or nickname would you like us to use?

2. In SR, the concept of applying policies at the ingress node reduces forwarding complexity at transit routers by using ____.

3. Which of the following is a key operational challenge when deploying SR at scale?

4. The primary difference between node SID and prefix SID is that prefix SID can be shared across ____.

5. In a multi-domain SR network, how does BGP-LS facilitate inter-domain path computation?

6. What does the S-bit in an SRv6 SID indicate?

7. In SR deployments at scale, what is the primary benefit of centralizing path computation?

8. Which routing protocol must be enabled to advertise node SIDs in an SR-MPLS network?

9. SRv6 uses a ____-bit address space compared to SR-MPLS.

10. What is a Binding SID (BSID) used for in SR-TE?

11. What is the primary advantage of Segment Routing over traditional MPLS in terms of state management?

12. What is the purpose of the Segment Routing Global Block (SRGB) in an SR network?

13. Which statement is true about Segment Routing and ECMP (Equal-Cost Multipath)?

14. In SR-MPLS, an adjacency segment (Adj-SID) identifies a ____.

15. What is the primary role of BGP-LS in an SR deployment?

16. Which of the following best describes Segment Routing Traffic Engineering (SR-TE)?

17. In SRv6, segment identifiers are represented as ____.

18. What is the maximum segment identifier (SID) value in MPLS SR?

19. Which protocol is used by a Path Computation Engine (PCE) to communicate with routers in an SR domain?

20. In SR-MPLS, what does a node segment represent?