4A0-106 Nokia Virtual Private Routed Networks Free Practice Exam Questions (2025 Updated)

PE1 pushes an LDP transport label.

CSC-CE1 pops the LDP label and pushes a BGP label.

CSC-PE1 pops the BGP label and pushes two labels: a VPN label and an MPLS transport label.

CSC-PE2 pops the MPLS label and pushes a BGP label.

PE1 sends an IPv4 update for prefix 192.168.1.0/27 via MP-BGP to ASBR1.

ASBR1 sends an IPv4 update for prefix 192.168.1.0/27 to ASBR2.

ASBR1 transforms an IPv4 update for prefix 192.168.1.0/27 to a VPN-IPv4 route; allocates VPN label V1 and sends the update to ASBR2.

ASBR2 accepts a VPN-IPv4 update from ASBR1, then sends the update to PE2 via MP-BGP.

No need to build and maintain its own backbone.

The solution scales as the number of serviced customer carriers increases.

The solution scales as the number of VPNs offered by the customer carriers increases.

The ability to manage end-customer services.

In the CSC VPRN, configure an eBGP session between CSC-PE and CSC-CE and use the "advertise-label vpn-ipv4" CLI command to enable the advertisement of VPN-IPv4 routes.

When the customer carrier uses the same autonomous system number in various sites, use the "loop-detect off" CLI command to disable the loop detection functionality on CSC-CE and PE routers.

On the CSC-PE routers, use the "carrier-carrier-vpn" CLI command to configure the VPRN service as CSC.

Configure an iBGP session between PE1 and PE2 and use the "family vpn-ipv4" CLI command to directly exchange end-customer routes learned from CE1 and CE2.

This approach is recommended when multiple sites advertise the same prefix.

This approach limits the opportunities for load balancing.

This approach requires additional memory on the PEs to store more routes.

This approach is recommended for extranet VPN.

This configuration is correct and complete

This configuration is correct except that the system interface must be added

This configuration is correct except that the interfaces facing the CE routers must be added.

MPLS configuration is not required

An MP-BGP update carries an MPLS label that is used as the service label for a VPRN.

There can be multiple Route Targets per route in an MP-BGP update.

There can only be one Route Distinguisher per route in an MP-BGP update.

On a specific PE, the MP-BGP updates for prefixes from a single VPRN carry different labels.

Traditional BGP attributes and MP-BGP attributes are present in an MP-BGP update.

The ASBRs use MP-eBGP to peer with each other and exchange IPv4 routes between autonomous systems.

The ASBRs use MP-iBGP to peer with PE routers in their autonomous system and exchange VPN-IPv4 routes.

The ASBRs maintain a mapping of labels for IPv4 routes exchanged between autonomous systems.

The ASBRs require per-VPRN configuration.

A single routing protocol for exchanging routes with both the internal customer routers and with the PE

MP-BGP to exchange routes with the PE.

MPLS and a routing protocol for the exchange of labels and routes with the PE

MPLS for exchanging labels with other CE devices

A routing protocol for exchanging routes with the internal customer routers and a routing protocol for exchanging routes with the PE

The Nokia 7750 SR allows the setting of the maximum number of routes that can be accepted in a VRF for a VPRN service.

The "maximum-routes" command is used to specify the maximum number of remote routes that can be held within a VRF for a VPRN service.

When the "maximum-routes" command is used with the "log-only" parameter, new routes are still learned.

Once the "threshold" value is reached, no new routes are added to the VRF.

Show service id base

Show router bgp routes

Show service id maximum-routes

Show router status

When sites of different VPRN customers use the same BGP AS number

When sites of the same VPRN customer use the same BGP AS number

When sites of different VPRN customers use different BGP AS numbers

When sites of the same VPRN customer use different BGP AS numbers

When the customer site AS number is the same as the provider AS number

Show router bgp routes

Show router bgp routes address-family vpn-ipv4

Show router bgp routes

Show router bgp routes

A

B

C

D

PE1

PE2, PE3 and PE4

PE1, PE2, PE3 and PE4

This command is not required for the configuration of this PE hub and spoke VPRN.

The PE will install a maximum of 40 prefixes into the customer vrf and generate a log message when 40 routes are received

The PE will install a maximum of 40 prefixes into the customer vrf, and generate a log message both when 30 and 41 routes are received

The PE will install a maximum of 40 prefixes into the customer vrf, generate a log message when 10 routes are received and disable learning of new routes at 41

The PE will install a maximum of 40 prefixes into the customer vrf, generate a log message when 10 routes are received and drop the connection at 41

The PE will install a maximum of 40 prefixes into the customer vrf, generate a log message when 4 routes are received and disable learning of new routes at 41

CSC eliminates the need for customer carriers to build and maintain their own MPLS backbone.

CSC is also known as carrier's carrier or carrier serving carrier.

The customer carrier provides VPN or Internet services to its end-customers.

A CSC VPRN is configured on the customer carrier's CSC-CE routers.

OSPF is not configured on the CE router

There is a problem with OSPF authentication

The operational MTU does not match

The PE and CE router have different OSPF interface types configured

None of the above

Reduced number of VPN tunnels that need to be managed.

Optimal routing between all sites.

Limited configuration required on the hub PE device.

Site to site redundancy support.