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Exam 400-151 All Questions

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Exam 400-151 topic 1 question 80 discussion

Actual exam question from Cisco's 400-151
Question #: 80
Topic #: 1
[All 400-151 Questions]

Which three benefits do VXLANs offer compared to VLANs (Choose three.)

  • A. It provides a solution toextend Layer 2 segments over a shared Layer 3 routed network.
  • B. It provides better utilization of available network paths in the underlay infrastructure.
  • C. VXLAN uses a 16-bit VNIS to overcome the 4094 VLAN scale limitation.
  • D. VXLAN uses a 24-bit VNID to overcome the 4094 VLAN scale limitation.
  • E. It provides a solution to extend Layer 2 segments over a single Layer 2 VLAN.
  • F. It provides better utilization of available network paths in the overlay infrastructure.
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Suggested Answer: ABD 🗳️
VXLANOverview As its name indicates, VXLAN is designed to provide the same Ethernet Layer 2 network services as VLAN does today, but with greater extensibility and flexibility. Compared to VLAN, VXLAN offers the following benefits: â— Flexible placement of multitenant segments throughout the data center: It provides a solution to extend Layer 2 segments over the underlying shared network infrastructure so that tenant workload canbe placed across physical pods in the data center. â— Higher scalability to addressmore Layer 2 segments: VLANs use a 12-bit VLAN ID to address Layer 2 segments, which results in limiting scalability of only 4094
VLANs. VXLAN uses a 24-bit segment ID known as the VXLAN network identifier (VNID), which enables up to 16 million VXLAN segments to coexist in the same administrative domain. â— Better utilization of available network paths in the underlying infrastructure: VLAN uses the Spanning Tree Protocol for loop prevention, which ends up not using half of the network links in a network by blocking redundant paths. In contrast, VXLAN packets are transferred through the underlying network based on its Layer 3 header and can take complete advantage of Layer 3routing, equal-cost multipath (ECMP) routing, and link aggregation protocols to useall available paths. VXLAN
Encapsulation and Packet Format VXLAN is a Layer 2 overlay scheme over a Layer 3 network. It uses MAC Address-in-User Datagram Protocol (MAC-in-UDP) encapsulation to provide a means to extend Layer 2 segments across the data center network. VXLAN is a solution to support a flexible, large-scale multitenant environment over a shared common physical infrastructure. The transport protocol over the physical data center network is IP plus UDP.
References:
by kidschannel1988 at April 3, 2025, 10:53 p.m.

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