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100+ Free Nokia VPLS Practice Questions

Pass your Nokia Virtual Private LAN Services (4A0-105) exam on the first try — instant access, no signup required.

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What is a VPLS hub-and-spoke topology?

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2026 Statistics

Key Facts: Nokia VPLS Exam

40

Exam Questions

Nokia 4A0-105 exam profile

90 min

Exam Duration

Nokia 4A0-105 exam profile

70%

Passing Score

Nokia SRC scoring policy

$125

Exam Fee (USD)

Pearson VUE Nokia pricing

Pearson VUE

Test Provider

Nokia SRC delivery partner

3 years

Credential Validity

Nokia SRC recertification policy

The Nokia VPLS exam (4A0-105) is a 40-question, 90-minute multiple-choice test delivered through Pearson VUE for $125 USD with a 70% passing score. Candidates are tested on VPLS architecture (RFC 4665), pseudowire encapsulation (RFC 4448), LDP-based signaling (RFC 4762) with FEC 128/129, BGP-based auto-discovery and signaling (RFC 4761, RFC 6624), advanced features including MAC management, multihoming (RFC 7623), IGMP snooping, and VPLS troubleshooting on Nokia 7750 SR OS. The credential is part of the Nokia Service Routing Certification program and is valid for three years.

Sample Nokia VPLS Practice Questions

Try these sample questions to test your Nokia VPLS exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What type of VPN technology is VPLS (Virtual Private LAN Service)?
A.Layer 2 VPN that emulates a LAN segment over an MPLS backbone
B.Layer 3 VPN that provides IP routing between customer sites
C.Layer 1 VPN that provides dedicated wavelength services
D.Application-layer VPN that secures HTTP traffic
Explanation: VPLS is a Layer 2 VPN technology that emulates a LAN segment over an MPLS backbone, allowing customer sites to appear as if they are on the same local Ethernet segment.
2Which protocol is used as the transport for VPLS pseudowires in an MPLS network?
A.MPLS with LDP or BGP signaling
B.IPsec with IKEv2
C.GRE with OSPF
D.SSL/TLS over TCP
Explanation: VPLS uses MPLS as the transport mechanism with either LDP (Label Distribution Protocol) or BGP for signaling pseudowires between provider edge routers.
3In VPLS, what is a pseudowire (PW)?
A.A virtual connection between two PE routers that emulates a point-to-point Ethernet link
B.A physical fiber connection between CE devices
C.An OSPF adjacency between provider routers
D.A BGP session between customer edge routers
Explanation: A pseudowire is a virtual point-to-point connection between two PE routers that emulates an Ethernet link, carrying customer Layer 2 traffic across the MPLS backbone.
4How does VPLS handle MAC address learning?
A.PE routers learn customer MAC addresses by examining the source MAC of frames received on pseudowires and attachment circuits
B.CE routers exchange MAC tables using BGP
C.MAC addresses are statically configured on all PE routers
D.The provider core routers learn all customer MAC addresses
Explanation: In VPLS, PE routers perform MAC learning by examining the source MAC address of incoming frames on both pseudowires and attachment circuits, building a MAC forwarding table per VPLS instance.
5What does VPLS do when a frame arrives with an unknown destination MAC address?
A.Floods the frame to all pseudowires and attachment circuits in the same VPLS instance except the one it arrived on
B.Drops the frame silently
C.Sends an ICMP error back to the source
D.Forwards the frame to the default gateway
Explanation: When a PE router receives a frame with an unknown destination MAC, it floods the frame to all ports (pseudowires and attachment circuits) in the same VPLS instance except the ingress port, mimicking standard Ethernet switch behavior.
6What is the purpose of the VPLS full-mesh of pseudowires?
A.To ensure any PE can directly forward traffic to any other PE in the same VPLS instance without requiring a hub
B.To provide redundancy for physical fiber links
C.To enable OSPF routing between all PE routers
D.To allow CE devices to exchange routing information
Explanation: A full mesh of pseudowires connects every PE to every other PE in the same VPLS instance, allowing direct forwarding without a central hub and avoiding the need for split horizon filtering in many designs.
7What is the split horizon rule in VPLS?
A.A PE must not forward traffic received on one pseudowire to another pseudowire in the same VPLS instance
B.A PE must not learn MAC addresses from more than one attachment circuit
C.A PE must divide its forwarding table equally among all VPLS instances
D.A PE must use separate VLAN tags for upstream and downstream traffic
Explanation: The split horizon rule prevents a PE from forwarding traffic received on one pseudowire out another pseudowire in the same VPLS instance, which avoids forwarding loops in a full-mesh topology.
8Which LDP FEC element type is used for signaling VPLS pseudowires with auto-discovery?
A.FEC 129
B.FEC 128
C.FEC 130
D.FEC 127
Explanation: FEC 129 (the generalized PWid FEC element) is used for VPLS pseudowire signaling when combined with BGP auto-discovery, providing greater flexibility in identifying pseudowires.
9Which LDP FEC element type is used for statically configured VPLS pseudowires?
A.FEC 128
B.FEC 129
C.FEC 130
D.FEC 126
Explanation: FEC 128 (PWid FEC element) is used for statically configured pseudowires where the VC ID is manually assigned and the pseudowire endpoints are explicitly configured on each PE.
10What is the primary advantage of BGP-based VPLS auto-discovery over manually configured pseudowires?
A.PE routers automatically discover other PEs in the same VPLS instance, eliminating the need for manual pseudowire configuration on each PE
B.BGP provides faster data-plane forwarding than LDP
C.BGP auto-discovery enables encryption on pseudowires
D.BGP eliminates the need for MPLS labels
Explanation: BGP auto-discovery allows PE routers to automatically learn about other PEs participating in the same VPLS instance, significantly reducing configuration overhead as new sites no longer require manual pseudowire configuration on every existing PE.

About the Nokia VPLS Exam

The Nokia 4A0-105 VPLS exam is a Service Routing Certification (SRC) credential that validates intermediate-to-advanced knowledge of Virtual Private LAN Services architecture, LDP-based and BGP-based VPLS signaling, advanced Layer-2 features including multihoming and multicast optimization, and VPLS operations and troubleshooting on Nokia 7750 SR routers running SR OS. It targets engineers who design, deploy, and operate Ethernet-based Layer-2 VPN services in service-provider networks.

Assessment

40 multiple-choice questions covering VPLS fundamentals, VPLS signaling (LDP and BGP), VPLS advanced features, and VPLS operations and troubleshooting on Nokia SR OS

Time Limit

90 minutes

Passing Score

70%

Exam Fee

$125 (Nokia / Pearson VUE)

Nokia VPLS Exam Content Outline

25%

VPLS Fundamentals

VPLS architecture (RFC 4665), Ethernet frame forwarding and MAC learning within a VPLS instance, full-mesh and hub-and-spoke topologies, pseudowire encapsulation (RFC 4448) with control word, MPLS transport for VPLS (label stack with transport and VC labels), and the split-horizon forwarding rule that prevents loops in full-mesh VPLS deployments on Nokia SR OS.

30%

VPLS Signaling

LDP-based VPLS signaling (RFC 4762) with targeted LDP (T-LDP) sessions, VC type (Ethernet VLAN, Ethernet), VC label exchange, PW status TLV signaling, FEC 128 (PW ID FEC) and FEC 129 (Generalized PW ID FEC with attachment group ID and attachment individual ID), and BGP-based VPLS auto-discovery and signaling (RFC 4761, RFC 6624) with VPLS BGP NLRI encoding, route targets, layer-2 information extended community, and VSI auto-discovery.

25%

VPLS Advanced Features

MAC address management (dynamic learning, static entries, aging timers, MAC flushing on failover, MAC move detection), STP interaction with VPLS, VPLS multihoming with all-active and single-active redundancy modes, BGP multi-homing (RFC 7623) with designated forwarder election, IGMP snooping and multicast optimization (head-end replication vs P2MP LSP), QoS marking and scheduling in VPLS, and subscriber management on Nokia SR OS.

20%

VPLS Operations and Troubleshooting

VPLS service verification with show service commands, pseudowire status monitoring and troubleshooting (PW up/down, signaling state), MAC table analysis (show service mac-table), SDP (Service Distribution Point) diagnostics, OAM tools for VPLS including CFM (IEEE 802.1ag) continuity check, link trace, and loopback, LSP Ping/Trace for pseudowire verification (RFC 4379 extensions), and Nokia 7750 SR operational workflows for VPLS instance debugging.

How to Pass the Nokia VPLS Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 40 multiple-choice questions covering VPLS fundamentals, VPLS signaling (LDP and BGP), VPLS advanced features, and VPLS operations and troubleshooting on Nokia SR OS
  • Time limit: 90 minutes
  • Exam fee: $125

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Nokia VPLS Study Tips from Top Performers

1Know the split-horizon rule cold: in a full-mesh VPLS, a PE never forwards a frame received from one pseudowire out another pseudowire - only to local access ports.
2Master the difference between FEC 128 (PW ID FEC with pre-provisioned PW IDs) and FEC 129 (Generalized PW ID FEC with auto-discovered attachments) - both are heavily tested.
3Understand BGP-based VPLS auto-discovery NLRI format and how the layer-2 information extended community carries VSI ID, VPLS edge device ID, and signaling capabilities.
4Drill multihoming redundancy modes: all-active (both PEs forward, designated forwarder handles BUM traffic) vs single-active (only the designated forwarder forwards all traffic).
5Memorize MAC flush triggers and how they interact with VPLS failover - service churn during convergence is a common exam scenario.
6Practice with show service id <svc-id> base, show service mac-table, and show router ldp bindings fec-type vc commands on Nokia SR OS - they appear in troubleshooting questions.
7Know when to use head-end replication vs P2MP LSP for BUM traffic in VPLS, and the Nokia SR OS configuration for each.

Frequently Asked Questions

What is on the Nokia 4A0-105 VPLS exam?

The Nokia 4A0-105 exam tests VPLS architecture (RFC 4665), pseudowire encapsulation (RFC 4448), LDP-based VPLS signaling (RFC 4762) with T-LDP sessions and FEC 128/129, BGP-based VPLS auto-discovery and signaling (RFC 4761, RFC 6624), advanced VPLS features including MAC management, multihoming (RFC 7623), IGMP snooping, and VPLS operations and troubleshooting on Nokia 7750 SR routers running SR OS. It is part of the Nokia Service Routing Certification (SRC) program and is required for the SRA track.

How long is the Nokia VPLS exam and how many questions does it have?

The 4A0-105 exam contains 40 multiple-choice questions with a 90-minute time limit. Nokia recommends pacing at roughly 2 minutes per question and saving a few minutes at the end to flag and review uncertain answers.

What is the passing score for Nokia 4A0-105?

Nokia requires a 70% score (28 of 40 correct) to pass the VPLS exam. Aim for 85% or higher in practice exams - VPLS signaling mechanics (FEC 128 vs 129), multihoming redundancy modes, and MAC management behavior during failover are common stumbling blocks.

How much does the Nokia 4A0-105 VPLS exam cost?

The 4A0-105 exam fee is $125 USD per attempt, paid to Pearson VUE at registration. Optional Nokia self-paced or instructor-led VPLS training is sold separately and is not required to sit the exam.

How long is the Nokia VPLS credential valid?

Nokia SRC credentials, including the VPLS exam, are valid for three years. To stay current, candidates must pass any current Nokia SRC exam within the three-year window or recertify by retaking 4A0-105.

Are there prerequisites for 4A0-105?

There are no formal prerequisites for 4A0-105, but candidates are expected to be comfortable with TCP/IP, MPLS fundamentals (LDP, RSVP-TE), and Ethernet switching. Nokia recommends, but does not require, NRS I (4A0-100) and MPLS (4A0-103) before sitting the exam.