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
- 229 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
Loading reviews…
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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