What is a Campus Network
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A campus network is a local area network that connects people and things within a limited area; a campus network usually has only one management entity; if there are multiple management entities, it is usually considered multiple campus networks.
Typical Campus Network Architecture
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Typical architecture of a small campus network
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Small campus networks are used in scenarios with a small number of access users, and generally support several to dozens of users. Network coverage is also limited to one location, and the network is not hierarchical. The purpose of network construction is often to meet the mutual visits of internal resources. Small-scale campus network features: a small number of users, only a single location, no hierarchical network, and simple network requirements 
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Typical architecture of a medium-sized campus network
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A large campus network can support the access of hundreds to thousands of users. The medium-sized network introduces the concept of partitioning by function, that is, the modular design idea, but there are relatively few functional modules. Generally, flexible partitioning is performed according to business needs. Features of a medium-sized campus network: medium-scale, most application occasions, and functional divisions Generally, a three-layer network structure is adopted: core, aggregation, and access 
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Typical architecture of a large campus network
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A large campus network may be a network that covers multiple buildings, or it may be a network that connects multiple campuses within a city through a WAN. Generally, access services are provided to allow employees on business trips to access the company's internal network through technologies such as VPN. Features of a large-scale campus network: wide coverage, large number of users, complex network requirements, complete functional modules, and rich network layers 
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Campus network main protocols/technologies
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Small Campus Network Design
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Networking scheme design
After comprehensive consideration of factors such as budget and business requirements, the physical topology is shown in the following figure:
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Basic service design: VLAN design
It is recommended to assign VLAN numbers continuously to ensure reasonable utilization of VLAN resources.
VLAN division needs to distinguish service VLAN, management VLAN and interconnection VLAN.
The most commonly used method of division is based on the interface.
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VLAN planning
Reserve the management VLAN of the Layer 2 device.
According to the personnel structure, it is divided into visitor VLAN, R&D department VLAN, marketing department VLAN, and administrative department VLAN.
Considering that the Layer 3 switch needs to be connected to the router through VLANIF, it is necessary to reserve interconnected VLANs.
VLAN required to establish a CAPWAP tunnel between the AP and the AC.
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Basic service design: IP address design
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IP address planning
Considering the number of access clients and reserving enough IP addresses, plan network segments and gateway addresses for each type of business.
为管理IP划分网段。
为互联IP划分网段。
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基础业务设计：IP地址分配方式设计
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IP地址分配方式规划
出口网关采用PPPoE方式获取IP地址。
所有终端采用DHCP方式获取IP地址，服务器及打印机分配固定的IP地址。
所有网络设备上的IP地址采用手工静态方式配置（AP除外）。
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基础业务设计：路由设计
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WLAN设计
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WLAN数据规划
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可靠性设计
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二层环路避免
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出口NAT设计
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安全设计
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运维管理设计
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小型园区网络调试
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小型园区网络运维
项目上线运行之后，就进入到了运维阶段，常见的运维手段包括：
设备环境检查
设备基本信息检查
设备运行状态检查
业务检查
告警处理
当网络达到一定规模，可以采用网络管理软件进行管理和运维，提升效率。
小型园区网络优化
通过网络优化，能够整体提升网络的可靠性、健壮性，更好的支撑企业业务的发展。
常见的优化方案包括但不限于：
设备性能优化，如升级硬件设备、更新设备软件版本等。
网络基础优化，如网络架构优化、路由协议调整等。
业务质量优化，如针对语音、视频业务的优先转发等。
应从网络需求出发，结合实际情况制定适合的优化方案。