CCIE依旧是IT行业含金量最高的职业认证，要想获得这一证书，需要掌握丰富的网络知识，并了解大量的技术细节，同时还要具有相当强的问题分析与解决能力。备考CCIE是艰苦的，但回报却又相当丰厚。以下是思科（Cisco）官网推荐的通过CCIE考试（路由与交换方向，Routing & Switching）需要阅读的专业技术书籍（并非强制）。当然，即便你只是对网络技术感兴趣，系统地阅读这些经典的网络技术书籍也会大有裨益。（2016年11月更新）

CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, 5th Edition

CCIE Routing and Switching v5.0 Official Cert Guide, Volume 2, 5th Edition

Cisco CCIE Routing and Switching v5.0 Troubleshooting Practice Labs, 2nd Edition

Cisco CCIE Routing and Switching v5.0 Configuration and Troubleshooting Practice Labs Bundle

CCIE Routing and Switching v5.0 Official Cert Guide Vol 1 Premium Edition eBook/Practice Test, 5th Edition

Cisco CCIE Routing and Switching v5.0 Configuration Practice Labs, 3rd Edition

Routing TCP/IP, Volume 1

Routing TCP/IP, Volume II (CCIE Professional Development)

Troubleshooting IP Routing Protocols

Inside Cisco IOS Software Architecture (CCIE Professional Development Series)

Cisco OSPF Command and Configuration Handbook (paperback)

Cisco BGP-4 Command and Configuration Handbook

Cisco Field Manual: Router Configuration

Developing IP Multicast Networks, Volume I

Internet Routing Architectures

MPLS and VPN Architectures

MPLS and VPN Architectures, Volume II

End-to-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs

Deploying IPv6 Networks

Network Security Technologies and Solutions (CCIE Professional Development Series)

Implementing EIGRP

IP Routing on Cisco IOS, IOS XE, and IOS XR: An Essential Guide to Understanding and Implementing IP Routing Protocols

Reference Material for Evolving Technology section

参考链接：

https://learningnetwork.cisco.com/docs/DOC-4601

ROE，是英文Return On Equity的缩写，其中文意思是：净资产回报率。ROE是用来衡量一家上市公司盈利能力的重要财务指标，也是价值投资者（value investor）对股票进行基本面分析的重要工具。ROE的计算方法（公式）为：ROE=（年度）净利润/平均股东净资产*100%。从ROE的计算结果，我们可以看到公司每投入1元钱，能挣到多少钱的利润回报。

一般来说，ROE的比例越高越好。通过将某家公司的ROE与其自身历史数据纵向比较，并与行业同类型公司纵向比较，我们可以对该公司的经营水平有较为客观的把握。ROE公式可进一步分解，变为如下形式：ROE = (one year’s earnings / one year’s sales) * (one year’s sales / assets) * (assets / shareholder equity)，从而更加清晰地看到一家企业的：利润率、库存周转率、杠杆率，帮助投资者更好地分析、判断企业的经营效率及赚钱能力。

参考链接：

http://www.financeformulas.net/Return-on-Equity.html

https://www.fool.com/how-to-invest/return-on-equity-an-introduction.aspx

http://www.investinganswers.com/financial-dictionary/financial-statement-analysis/return-equity-roe-916