ToR Switch, Rack

#Infra #On-premises #Concept

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1. What Is a Rack?

In a data center, there’s a large metal shelf-like frame used to stack servers and network equipment.

That’s called a Rack.

  • A single rack holds multiple servers, storage units, and network devices all lined up
  • Servers like the Dell R760 and R730xd you’ve seen are all equipment that goes inside a rack

2. What Is ToR (Top of Rack)?

  • Top of Rack = the network device sitting at the very top of a rack

  • That device is a Switch

  • For the servers inside the rack to use the network, they need somewhere to plug in their cables, right?

    → Think of that plug-in point as the ToR switch

3. Why Put It at the Top?

  • Easier cable management (servers only need to run cables upward)
  • Easier to manage (one per rack keeps the structure simple)
  • In large-scale data centers, this is the standard approach

4. A Super Simple Analogy

  • You have a home router (Wi-Fi router), right? → It plays a similar role to a ToR switch
  • If you have multiple computers at home, they all connect to the router to use the internet, right?
  • In a data center, multiple servers plug into a ToR switch, and that ToR switch connects upstream to the broader network

5. Simple Diagram

[ 데이터센터 큰 네트워크 ]
          |
      [ ToR 스위치 ]   ← 랙 맨 위에 있음
      /   |   \
 [서버] [서버] [서버]  ← 같은 랙 안 장비들