H12-821_V1.0 · Question #851
The VNI field length of VXLAN packets is 24 bits.
The correct answer is A. TRUE. Option A is correct because VXLAN (Virtual Extensible LAN), defined in RFC 7348, uses a 24-bit VNI (VXLAN Network Identifier) field within its 8-byte header, which allows for up to 2^24 (approximately 16.7 million) unique network segments. This was a deliberate design choice to…
Question
Options
- ATRUE
- BFALSE
How the community answered
(31 responses)- A81% (25)
- B19% (6)
Explanation
Option A is correct because VXLAN (Virtual Extensible LAN), defined in RFC 7348, uses a 24-bit VNI (VXLAN Network Identifier) field within its 8-byte header, which allows for up to 2^24 (approximately 16.7 million) unique network segments. This was a deliberate design choice to overcome the 4,096-segment limitation of traditional VLANs, which use only a 12-bit identifier. Option B is wrong simply because the 24-bit VNI length is a fixed, standardized specification - it is not 12-bit (VLAN), 32-bit, or any other value.
Memory tip: Think "VXLAN = eXpanded LAN" - it eXpands the old 12-bit VLAN ID by doubling it to 24 bits, giving you millions of segments instead of thousands.
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