[End] Round 60 | Join the Daily Q&A Challenge and Get Coins
  

Sangfor Jojo Lv5Posted 2026-Jun-03 09:25



Are you smarter than the average IT Pro?

Find out by joining the Sangfor Daily Challenge and answering a new tech question each day.
The questions for the Daily Q&A Challenge are designed around common configuration knowledge, usage tips, and best practices for Sangfor products. We hope to help more people learn about and use Sangfor products through this activity.  

Now today’s question is:
Which network solution is used for east-west VM communication in HCI?
   A. VLAN
  B. VXLAN
   C. iSCSI
   D. NFS



How to Play                                                                                                                        

Reply to the thread with your correct answers.
For example:  A. Upgrade all endpoints at once during working hours to complete the task quickly


Coins to Get                                                                                                                        

1. Users who reply to the thread with correct answers will get 100 coins. No coins for wrong answers.  
2. Users who answer correctly for 5 consecutive days within a week will receive 200 coins.  
3. Users who achieve a 100% average answer accuracy rate within a month will receive 300 coins.


Participation Rules                                                                                                            

1. The event only works for logged-in members who have been verified as Sangfor partners or VIP customers, or other unauthenticated members at level 2 or above.
2. Once you’ve answered the question, the next one will be available starting before 10:00 (UTC +08) of the next business day.   
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4. Sangfor Community admin will send the coin rewards to your account once the activity ends via the system message.



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jeffC Lv2Posted 2026-Jun-04 06:15
  
My answerr is

B. VXLAN
George Fady Lv2Posted 2026-Jun-04 05:06
  
the correct answer is B. VXLAN.ExplanationIn the Sangfor HCI network virtualization architecture, the Virtual Switch (often a Distributed Virtual Switch) allows for Layer 2 communication between virtual machines (VMs). To enable this efficient communication across the HCI infrastructure, Sangfor HCI utilizes the VXLAN (Virtual Extensible LAN) network protocol as an overlay interface to achieve seamless connectivity. VXLAN effectively encapsulates traffic, allowing for the flexible "east-west" (server-to-server or VM-to-VM) communication required in modern virtualized data center environments.  Correct Answer:B. VXLAN

1. The Concept: East-West vs. North-South Traffic
In a data center environment, traffic patterns are categorized by their direction:

North-South Traffic: Communication between the internal data center (VMs) and the external network (clients, users, the internet).

East-West Traffic: Communication occurring within the data center, specifically between Virtual Machines (VMs), storage nodes, or server-to-server traffic.

In a Hyper-Converged Infrastructure (HCI), the vast majority of traffic is East-West (e.g., a web server talking to an app server, or an app server querying a database).

2. Why VXLAN is the Standard
Traditional networks rely heavily on VLANs (Virtual LANs). However, VLANs have significant limitations in modern HCI and Cloud environments:

Scalability: VLANs are limited to 4,094 IDs. Large data centers or multi-tenant clouds require thousands more segments.

Flexibility: VLANs are physically tied to the underlying network configuration, making it difficult to move VMs across hosts (Live Migration) without breaking network connectivity.

VXLAN (Virtual Extensible LAN) solves these problems by creating a virtual "Overlay" network on top of the existing physical "Underlay" network.

3. Step-by-Step: How East-West Communication Works in VXLAN
When VM-A (on Host 1) wants to talk to VM-B (on Host 2), the following steps happen inside the HCI virtual network layer:

Encapsulation (Sender side): When the source VM sends an Ethernet frame, the virtual switch (distributed vSwitch) on the host intercepts it. It wraps (encapsulates) the original Ethernet frame inside a UDP packet.

Overlay Creation: The packet is given a VXLAN header, which includes a VNI (VXLAN Network Identifier). This VNI acts like a VLAN tag but supports up to 16 million segments, allowing for massive scalability.

Transport (Physical Network): The HCI host sends this UDP packet over the physical network (the Underlay) to the destination host. Because it is just a standard IP packet to the physical switches, it passes through the network easily regardless of complex physical topology.

Decapsulation (Receiver side): The destination host receives the UDP packet, strips away the VXLAN header, and extracts the original Ethernet frame.

Delivery: The host delivers the original frame to the destination VM (VM-B).

4. Why the other options are incorrect:
A. VLAN: While used in many networks, it is technically limited for the dynamic, scalable requirements of modern HCI environments, which is why VXLAN is the preferred architectural solution for virtualization.

C. iSCSI: This is a storage protocol, not a network communication protocol for VM-to-VM traffic. It is used to connect servers to block storage devices.

D. NFS: Like iSCSI, this is a storage protocol (Network File System) used for sharing file-level storage, not for managing VM-to-VM network communication.
Newbie585065 Lv2Posted 2026-Jun-04 02:33
  
B. VXLAN      
Brando Lv5Posted 2026-Jun-04 00:04
  
  B. VXLAN           
AriAri Lv2Posted 2026-Jun-03 23:04
  
B. VXLAN is my answer
Kbob Lv3Posted 2026-Jun-03 22:51
  
B. VXLAN               
Rendy Rinaldy Lv3Posted 2026-Jun-03 22:48
  
B. VXLAN        
Enrico Vanzetto Lv5Posted 2026-Jun-03 21:57
  
B. VXLAN         
Zonger Lv5Posted 2026-Jun-03 20:20
  
B. VXLAN   
MTR Lv2Posted 2026-Jun-03 19:44
  
The correct answer is B. VXLAN