CCNP MPLS and VPN Technologies

Question 1

What is the primary function of a Label Edge Router (LER) in an MPLS network?

Accepted Answer

Push or pop MPLS labels at the boundary of the MPLS domain

Answer

Forward packets based solely on IP routing tables

Answer

Assign BGP community attributes to MPLS paths

Answer

Perform RSVP signaling between core routers

Question 2

In MPLS LDP, what is the default label distribution mode on Cisco routers?

Accepted Answer

Independent control with downstream unsolicited

Answer

Ordered control with downstream on demand

Answer

Ordered control with upstream on demand

Answer

Independent control with downstream on demand

Question 3

Which MPLS label value is reserved to indicate the Explicit Null label for IPv4?

Accepted Answer

0

Answer

1

Answer

2

Answer

3

Question 4

What mechanism does Penultimate Hop Popping (PHP) use to reduce processing on the egress LSR?

Accepted Answer

The second-to-last LSR pops the outermost label before the final hop

Answer

The ingress PE router pops the label before forwarding

Answer

The egress PE applies a swap operation instead of a pop

Answer

BGP next-hop self is enabled on the penultimate router

Question 5

In an MPLS L3VPN, which protocol is used to exchange VPN routing information between PE routers?

Accepted Answer

MP-BGP with VPNv4 address family

Answer

OSPF with route redistribution

Answer

IS-IS with extended TLVs

Answer

EIGRP with named mode

Question 6

What is the purpose of a Route Distinguisher (RD) in MPLS L3VPN?

Accepted Answer

It makes overlapping customer IP prefixes unique in the BGP table

Answer

It selects which VRF imports a prefix from BGP

Answer

It defines the MPLS label stack depth for VPN packets

Answer

It authenticates BGP sessions between PE routers

Question 7

Which command verifies the MPLS label forwarding table on a Cisco router?

Accepted Answer

show mpls forwarding-table

Answer

show ip route mpls

Answer

show mpls ldp bindings detail

Answer

show mpls traffic-eng tunnels