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LX0-104 · Question #365

In which of the following scenarios MUST an administrator use ethernet bridging instead of routing when configuring an OpenVPN site? (Select TWO correct answers)

The correct answer is B. NetBIOS traffic must be able to traverse the VPN without implementing a WINS server. E. The IPX protocol is required.. This question identifies scenarios where OpenVPN bridging mode is essential over routing, specifically for non-IP protocol support.

Networking Fundamentals

Question

In which of the following scenarios MUST an administrator use ethernet bridging instead of routing when configuring an OpenVPN site? (Select TWO correct answers)

Options

  • ASome OpenVPN clients will be installed on laptops and must be able to connect from different locations.
  • BNetBIOS traffic must be able to traverse the VPN without implementing a WINS server.
  • CThe IPv4 protocol is required.
  • DIt will be necessary to use an MTU setting other than the default.
  • EThe IPX protocol is required.

How the community answered

(23 responses)
  • A
    9% (2)
  • B
    74% (17)
  • C
    13% (3)
  • D
    4% (1)

Why each option

This question identifies scenarios where OpenVPN bridging mode is essential over routing, specifically for non-IP protocol support.

ASome OpenVPN clients will be installed on laptops and must be able to connect from different locations.

Both routing and bridging modes support clients connecting from various locations, so this is not a scenario exclusive to bridging.

BNetBIOS traffic must be able to traverse the VPN without implementing a WINS server.Correct

NetBIOS relies heavily on broadcast traffic for name resolution and service discovery; routing mode typically blocks such broadcasts, so bridging mode is required to allow NetBIOS traffic to traverse the VPN without a WINS server.

CThe IPv4 protocol is required.

OpenVPN's default routing mode (tun) and bridging mode (tap) both fully support the IPv4 protocol.

DIt will be necessary to use an MTU setting other than the default.

MTU settings can be configured and adjusted in both OpenVPN routing and bridging configurations.

EThe IPX protocol is required.Correct

The IPX protocol operates at Layer 3 but is not an IP-based protocol; OpenVPN's routing mode (tun device) is designed for IP traffic, so bridging mode (tap device), which operates at Layer 2, is necessary to encapsulate and transport non-IP protocols like IPX.

Concept tested: OpenVPN routing vs. bridging scenarios

Source: https://openvpn.net/community-resources/how-to-implement-a-bridged-vpn-with-openvpn/

Topics

#OpenVPN#ethernet bridging#routing#NetBIOS

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