MPLS Implementation for Enterprise Infrastructure

1. MPLS penultimate hop popping (PHP) is enabled by which mechanism?

Explicit label assignment

Implicit null label (label 3)

Label retention mode

TTL inheritance

Submit

3. What is the difference between a Label Switched Path (LSP) and a traditional IP route?

LSPs use labels for forwarding; IP routes use destination IP addresses

LSPs only work in MPLS VPN; IP routes work everywhere

LSPs are faster than IP routes

LSPs require encryption; IP routes do not

4. Which Cisco feature enables MPLS Fast Reroute (FRR) to protect against link failures?

RSVP-TE with facility backup

LDP link protection

BGP route refresh

ISIS flooding optimization

Submit

6. What is the main advantage of using BGP for label distribution over LDP in large-scale deployments?

BGP requires fewer TCP connections

BGP integrates naturally with BGP routing and policy control

BGP has faster convergence than LDP

BGP uses less bandwidth than LDP

Submit

8. Which MPLS convergence mechanism provides sub-50ms failover times?

BFD with MPLS TE FRR

LDP graceful restart

BGP convergence

IGP re-convergence

9. In MPLS VPN, what is a Route Target (RT)?

A label that identifies the customer

An extended BGP community that controls VPN route import/export

A physical interface for VPN traffic

The encryption key for VPN tunnels

10. What is the purpose of the Segment Routing (SR) extension in modern MPLS deployments?

Simplify label distribution by encoding path info in packet header

Increase label size for more routes

Replace BGP routing entirely

Encrypt all MPLS traffic

11. What is the primary function of the Label Information Base (LIB) in MPLS?

Store mappings between FEC and labels

Forward packets based on IP destination only

Maintain routing protocol updates

Encrypt label information across hops

12. In RSVP-TE, what does the Explicit Route Object (ERO) specify?

The exact path a tunnel must follow

The bandwidth requirement for the LSP

The backup route for fast reroute

The priority level of the tunnel

13. Which MPLS feature enables the creation of multiple customer VPNs over a single provider backbone?

MPLS TE

MPLS VPN (BGP/MPLS)

LDP

RSVP

14. What are the two main types of LDP discovery mechanisms?

Basic and Extended

Link-local and Targeted

Primary and Secondary

Active and Passive

Submit

16. LDP uses which port number for TCP communication?

179

646

500

1433

17. Which MPLS application allows traffic to be engineered along a specific path rather than following IGP shortest path?

MPLS VPN

Traffic Engineering (TE)

Label Hopping

Segment Routing

18. What is the standard label size in MPLS?

8 bits

16 bits

20 bits

32 bits

19. In MPLS, what does the Forwarding Equivalence Class (FEC) represent?

A group of packets treated identically for forwarding

The physical interface for label switching

The encryption standard for labels

A backup route for traffic rerouting

20. Which protocol is used by default for label distribution in Cisco IOS XE?

BGP

LDP

RSVP-TE

ISIS

CCIE Enterprise Infrastructure MPLS Implementation Quiz

1. MPLS penultimate hop popping (PHP) is enabled by which mechanism?

2.

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

2. In MPLS TE, the Affinity Attribute controls which resources can be used by a tunnel via ______ masks.

3. What is the difference between a Label Switched Path (LSP) and a traditional IP route?

4. Which Cisco feature enables MPLS Fast Reroute (FRR) to protect against link failures?

5. In MPLS, the TTL (Time to Live) field is decremented at each ______ to prevent loops.

6. What is the main advantage of using BGP for label distribution over LDP in large-scale deployments?

7. The MPLS label stack allows multiple labels to be ______ on a single packet.

8. Which MPLS convergence mechanism provides sub-50ms failover times?

9. In MPLS VPN, what is a Route Target (RT)?

10. What is the purpose of the Segment Routing (SR) extension in modern MPLS deployments?

11. What is the primary function of the Label Information Base (LIB) in MPLS?

12. In RSVP-TE, what does the Explicit Route Object (ERO) specify?

13. Which MPLS feature enables the creation of multiple customer VPNs over a single provider backbone?

14. What are the two main types of LDP discovery mechanisms?

15. In MPLS, the label is typically placed between the ______ and IP headers.

16. LDP uses which port number for TCP communication?

17. Which MPLS application allows traffic to be engineered along a specific path rather than following IGP shortest path?

18. What is the standard label size in MPLS?

19. In MPLS, what does the Forwarding Equivalence Class (FEC) represent?

20. Which protocol is used by default for label distribution in Cisco IOS XE?