Computer-Networking-A-Top-Down-Approach-6th-E.pdf

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In Chapter 1, the treatment of access networks has been modernised, and the description of the internet ISP ecosystem has been substantially revised, accounting for the recent emergence of content provider networks, such as Google’s. The presentation of packet switching and circuit switching has also been reorganised, providing a more topical rather than historical orientation.

In Chapter 2, Python has replaced Java for the presentation of socket programming. While still  explicitly exposing the key ideas behind the socket API, Python code is easier to understand for the novice programmer. Moreover, unlike Java, Python provides access to raw sockets, enabling students to build a larger variety of network applications. Java-based socket programming labs have been

replaced with corresponding Python labs, and a new Python-based ICMP Ping lab has been added. As always, when the material is retired from the book, such as Java-based socket programming material, it remains available on the book’s Companion Website (see following text). 

In Chapter 3, the presentation of one of the reliable data transfer protocols has been simplified and a new sidebar on TCP splitting, commonly used to optimise the performance of cloud services, has been added. 

In Chapter 4, the section on router architectures has been significantly updated, reflecting recent developments and practices in the field. Several integrative sidebars involving DNS, BGP, and OSPF are included 

Chapter 5 has been reorganized and streamlined, accounting for the ubiquity of switched Ethernet in local area networks and the consequent increased use of Ethernet in point-to-point scenarios. Also, a new section on data center networking has been added.

Chapter 6 has been updated to reflect recent advances in wireless networks, particularly cellular data networks and 4G services and architecture. 

Chapter 7, which focuses on multimedia networking, has gone through a major revision. The chapter  includes an in-depth discussion of streaming video, including adaptive streaming, and an entirely new and modernized discussion of CDNs. A newly added section describes the Netflix, YouTube, and Kankan video streaming systems. The material that has been removed to make way for these new topics is still available on the Companion Website.  

Chapter 8 contains an expanded discussion on endpoint authentication.