Mikrotik MTCRE-04

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Questions and Answers

Qual é a principal diferença entre VPNs Layer 2 e Layer 3 no MPLS?

  • A camada de enlace suporta tunelamento no Layer 2.
  • Apenas VPNs Layer 3 utilizam pseudowires.
  • VPNs Layer 2 não possuem suporte a VPLS.
  • VPNs Layer 3 utilizam VRFs para segregar tráfego. (correct)

O Route Distinguisher (RD) é usado para identificar rotas únicas em uma VPN MPLS Layer 3.

True (A)

O que acontece se o MTU de uma interface em um túnel VPLS for menor que o esperado?

  • Pacotes serão fragmentados corretamente.
  • Pacotes serão descartados ou gerarão mensagens ICMP. (correct)
  • As sessões BGP relacionadas ao túnel serão encerradas.
  • O tráfego será redirecionado para outras interfaces.

Qual protocolo de roteamento pode ser usado entre roteadores PE e CE em uma VPN MPLS?

<p>Todos os anteriores (D)</p> Signup and view all the answers

Em uma VPN MPLS Layer 3, o Route Target (RT) é usado para:

<p>Permitir a importação e exportação de rotas entre VRFs. (B)</p> Signup and view all the answers

O que é "Explicit Null" no MPLS?

<p>Configuração para preservar o QoS. (A)</p> Signup and view all the answers

Filtros de entrada (IN) controlam as rotas recebidas e manipulam o tráfego de saída.

<p>True (A)</p> Signup and view all the answers

O que significa o termo "split horizon" em redes VPLS?

<p>Bloquear a propagação de pacotes entre interfaces com o mesmo valor de horizon. (A)</p> Signup and view all the answers

Qual é a principal vantagem de usar BGP para VPLS em vez de LDP?

<p>Reduz a necessidade de configuração manual de túneis. (C)</p> Signup and view all the answers

Qual comando habilita filtros para rotas específicas no MPLS LDP?

<p>/mpls ldp advertise-filter (A)</p> Signup and view all the answers

Flashcards

Difference between Layer 2 and Layer 3 VPNs in MPLS

Layer 3 VPNs use Virtual Routing and Forwarding (VRFs) to isolate traffic streams, while Layer 2 VPNs do not.

Role of Route Distinguisher (RD) in MPLS Layer 3 VPNs

The RD uniquely identifies routes within a specific VPN, preventing routing conflicts.

Impact of small interface MTU in VPLS tunnels

Packets exceeding the interface MTU will be dropped or cause ICMP messages.

Routing protocol between PE and CE routers in MPLS VPN

Any routing protocol (like BGP) can be used to exchange routing information.

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Route Target (RT) function in MPLS Layer 3 VPN

RT allows the import and export of routes between different VRFs in a VPN.

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Meaning of Explicit Null in MPLS

Explicit Null is a configuration that preserves Quality of Service (QoS) parameters during encapsulation.

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Function of Input (IN) filters in MPLS

Input filters control received routes and manipulate outgoing traffic.

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Split Horizon in VPLS Networks

A mechanism that prevents routing loops by not advertising routes back to the source interface

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Advantage of BGP over LDP for VPLS

BGP reduces the need for manual tunnel configurations.

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Command for enabling filters for specific routes in MPLS LDP

/mpls ldp advertise-filter

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