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300-730 · Question #118

Refer to the exhibit. Based on the configuration output, what is the VPN technology?

The correct answer is C. L2VPN. The configuration output shows a Layer 2 VPN (L2VPN) technology, which operates at the data link layer to extend Layer 2 connectivity across a routed network.

Site-to-site Virtual Private Networks on Routers and Firewalls

Question

Refer to the exhibit. Based on the configuration output, what is the VPN technology?

Options

  • Asite-to-site
  • BDMVPN
  • CL2VPN
  • Dmulticast VPN

How the community answered

(23 responses)
  • A
    4% (1)
  • B
    4% (1)
  • C
    91% (21)

Why each option

The configuration output shows a Layer 2 VPN (L2VPN) technology, which operates at the data link layer to extend Layer 2 connectivity across a routed network.

Asite-to-site

Site-to-site VPN uses IPsec tunnel mode to connect two networks at Layer 3, and its configuration shows crypto maps, transform sets, and access lists - not Layer 2 bridging constructs.

BDMVPN

DMVPN is identified by mGRE tunnel interfaces and NHRP configuration, which enable dynamic spoke-to-spoke tunnels - not present in an L2VPN configuration.

CL2VPNCorrect

L2VPN technologies such as VPLS, EoMPLS, or L2TPv3 are identified by configuration elements like xconnect statements, pseudowire encapsulation, or VPLS bridge-domains that indicate Layer 2 forwarding across an IP or MPLS core. These constructs are distinct from Layer 3 VPN configurations and signal that the tunnel is carrying Ethernet or other Layer 2 frames rather than routed IP traffic.

Dmulticast VPN

Multicast VPN uses MDT or mLDP profiles and VRF-based multicast routing configuration, which is unrelated to Layer 2 forwarding constructs seen here.

Concept tested: Identifying L2VPN technology from configuration output

Source: https://www.cisco.com/c/en/us/tech/ip/layer-2-vpns-l2vpn/index.html

Topics

#L2VPN#VPN technology identification#site-to-site#exhibit analysis

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