Understand the certification
Cisco 300-820 CLCEI (Implementing Cisco Collaboration Cloud and Edge Solutions) 是 CCNP Collaboration 的 Concentration 选修之一,聚焦 Cisco Expressway-C/E 边界控制器、Mobile & Remote Access (MRA)、B2B SIP/H.323 视频互通、Webex Hybrid Services 的部署与排障。
考试规格:65 题 / 120 分钟,及格 825/1000,考试费 $330 USD,有效期 3 年。
核心考纲领域:
- Expressway-C and Expressway-E — 35%:Expressway 集群部署、证书管理(CA-signed cert + trust chain)、traversal zone(client/server)配置、DNS 记录(SRV _collab-edge)、防火墙端口需求(8443/TCP, 2222/TCP)
- Mobile and Remote Access (MRA) — 25%:Jabber/Webex App 通过 Expressway 穿越注册到 CUCM 的全流程、OAuth token 认证、Unified CM Service Discovery
- B2B Communication — 20%:SIP B2B trunk 通过 Expressway-E、H.323 interworking、URI dialing(user@domain.com)、bandwidth management
- Webex Hybrid Services — 20%:Hybrid Calendar (Exchange/O365 集成)、Hybrid Call Service Connect/Aware、Hybrid Message Service、Expressway-C connector
300-820 和 300-810 (CLICA) 的区别:CLICA 偏内网 UC 应用(CUCM/Unity/IM&P),CLCEI 偏边界穿越和云集成(Expressway/MRA/Webex Hybrid)。如果你日常管 Expressway 对和 Webex hybrid connector,选 CLCEI;如果你日常在 CUCM Admin 里加分机,选 CLICA。
Exam at a glance
- Exam code
- 300-820
- Provider
- Cisco
- Format
- Single choice / Multiple select
- Language
- English
- Validity
- 3 years
- Exam fee
- $330
Skills in focus
Learning outcomes
- Prepare for the Cisco 300-820 CLCEI exam with a structured study path
- Deploy and troubleshoot Expressway and Webex hybrid services more confidently
- Handle certificates, TLS, and traversal requirements correctly
- Improve your fit for collaboration cloud and edge implementation roles
Who this is for
- Collaboration engineers deploying cloud and edge services
- Voice and UC engineers working with Expressway, CUCM, and Webex
- IT professionals responsible for collaboration security and connectivity
- Candidates preparing for the Cisco 300-820 CLCEI exam
Before you start
- Basic Cisco collaboration knowledge is recommended
- Familiarity with CUCM, SIP, and DNS will help
- Hands-on access to Expressway or a lab environment is strongly recommended
- Understanding certificates and firewall traversal is useful
Consider another path if
- 纯 Webex Cloud 管理员 — Control Hub 够用,Expressway 知识用不上
- 目标 Microsoft Teams 生态的人 — CLCEI 知识在 Teams Direct Routing 下不通用
- 没有 Expressway 或视频会议实操经验的纯路由交换工程师
Your learning path
6 chapters
Plan your preparation
- Learning hours
- 40h
- With relevant experience
- 8-12 weeks
- Starting from scratch
- 16-20 weeks
- Daily study
- 1.5-2h
Included in your preparation
- 231 practice questions focused on collaboration cloud and edge tasks
- Coverage of Expressway, MRA, Webex hybrid services, and certificate handling
- Practical review of edge deployment and troubleshooting scenarios
- Mock exam aligned to the official 120-minute format
- Detailed explanations that focus on how the collaboration pieces fit together
1. 第一阶段:Expressway 架构 + 证书体系(3-4 周)
搭 Expressway-C + Expressway-E Lab(CML 或 VMware Workstation 跑 OVA,每台 4GB RAM)。核心任务:理解 Expressway-C (内网) 和 Expressway-E (DMZ) 的角色差异、traversal zone (client/server) 的建立流程、证书信任链(Expressway-E 需要公网 CA 签名证书,Expressway-C 可以用内部 CA)、DNS SRV 记录 _collab-edge._tls.domain.com 指向 Expressway-E。
2. 第二阶段:MRA + B2B 通信(3-4 周)
MRA 全流程:Jabber 在外网 → DNS SRV 发现 Expressway-E → HTTPS 穿越到 Expressway-C → CUCM 认证(OAuth token)→ 注册成功。每一步都可能出题。B2B:Expressway-E 上配 SIP B2B search rule + transform、H.323 gatekeeper 模式、带宽管理(zone bandwidth limits)。排障重点:证书错误(SAN 字段不匹配)和防火墙端口(8443 没开)是两大高频故障原因。
3. 第三阶段:Webex Hybrid + 刷题冲刺(2-3 周)
Webex Hybrid Services 20% 权重不能丢。Hybrid Calendar(Exchange connector / O365 connector 部署在 Expressway-C 上)、Hybrid Call Service(Connect 模式 vs Aware 模式的区别 — Connect 走 on-prem 通话路径,Aware 只做一键呼叫按钮)。最后 1 周刷 Boson ExSim for 300-820 或 Cisco Learning Network 模考。
Career value
CLCEI 的市场定位:企业 on-prem 视频会议(Cisco TelePresence/Room 系列)向 Webex 云迁移的过渡期,Expressway 是关键桥梁。混合部署(on-prem CUCM + Webex Cloud)是当前企业 UC 的主流架构,Expressway-C/E 负责边界穿越和 hybrid connector,懂这套的人在 Cisco partner 生态里吃香。
谁在招:Cisco Gold Partner 的 Collaboration practice(Data#3、Logicalis、CDW、Presidio)、大型企业 IT 的视频会议团队(尤其金融、政府、医疗行业,这些行业对 on-prem 有合规要求,不能全上 Webex Cloud)。
薪资:和 CLICA 持证者薪资区间接近,美国 $95-140K,澳洲 $115-150K AUD。Expressway + Webex Hybrid 双技能的人比纯 CUCM 运维稍有溢价,因为涉及安全证书和防火墙规则设计。
不适合考的人:纯 Webex Cloud 管理员(Webex Control Hub 够用,不需要 Expressway)。目标是 Microsoft Teams 生态的人 — CLCEI 的知识在 Teams Direct Routing 场景下完全不通用。
- 澳洲
- AUD 115,000 – 155,000
- 美国
- USD 95,000 – 145,000
- 中国
- CNY 220,000 – 420,000
Preparation tips
- **Expressway Lab 必须搭** — 没有 Expressway 实操经验纯背概念,MRA 和 B2B 排障题必挂。CML 或 VMware Workstation 跑两台 Expressway OVA 即可。
- **证书是第一高频考点** — SAN 字段、trust chain、CA vs self-signed、证书续期流程,至少 5-8 道题和证书相关。
- **120 分钟 65 题** — 有 GUI Sim 题让你在 Expressway Web UI 上操作。前面选择题压到 90 秒/题给 Sim 留空间。
Common mistakes
- **Expressway-C 和 Expressway-E 角色搞反** — Expressway-C 在内网(traversal client),Expressway-E 在 DMZ(traversal server)。证书要求不同:E 需要公网 CA 证书(给外部客户端验证),C 可以用内部 CA。配反了 MRA 和 B2B 全不通。
- **MRA 的 DNS SRV 记录名记错** — 外部 Jabber 发现 Expressway-E 用的是 `_collab-edge._tls.domain.com`,不是 `_sip._tls` 或 `_cisco-uds._tcp`。三个 SRV 记录用途完全不同,混用会导致客户端连错服务。
- **Hybrid Call Service Connect vs Aware 区别** — **Connect**:通话走 on-prem 路径(CUCM → PSTN),Webex App 上的"呼叫"按钮触发 CUCM 回拨。**Aware**:只在 Webex App 里显示在线状态和一键呼叫按钮,通话本身不经过 on-prem。考题经常给场景问"用哪种模式",混了就错。
- **防火墙端口需求记不全** — Expressway-C → Expressway-E 穿越用 **TCP 7001 (SIP)** 和 **TCP 2222 (traversal media)**;Expressway-E 对外用 **TCP 8443 (HTTPS/MRA)** 和 **TCP 5061 (SIP TLS B2B)**。最常漏开 2222 导致"信令通但没声音"。
Before you register
How difficult is the 300-820 exam?
The exam is 120 minutes long. A systematic preparation period of 3-6 months is recommended. Through the systematic practice in this course, you can effectively improve your pass rate.
How much does the exam cost?
The 300-820 exam costs $330 USD. The certification is valid for 3 years.
Learner experiences
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日常管 30+ 间会议室的 Cisco Room Kit + Expressway 对。考 CLCEI 最难的是 证书链排障 — Expressway-E 的 SAN 字段必须包含 Expressway-E FQDN + collab-edge SRV 记录的域名,漏一个 MRA 就断。真考 2 道排障题都围绕证书展开。建议把 Expressway Admin Guide 的 Certificate 章节逐字读完。
M. Li
Video Collaboration Engineer (MSP, 新加坡) · 847/1000 · 11 weeks
银行合规要求 on-prem CUCM + Webex Hybrid。考 CLCEI 是因为 Hybrid Calendar 和 Hybrid Call Service 我部署了一年想拿个认证背书。最意外的是 B2B H.323 interworking 还在考 — 我以为全行业都上 SIP 了,结果还有 H.323 gatekeeper 的题。不能跳过。
某大型银行 IT
UC 架构师(悉尼) · 872/1000 · 9 weeks
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