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Network Programmability and Automation Fundamentals, 1st edition
Published by Cisco Press (June 28, 2021) © 2021
- Khaled Abuelenain
- Anton Karneliuk
- Vinit Jain Best-selling Cisco Press author, expert trainer, and Cisco Certified Internetwork Expert (No. 22854)
- Jeff Doyle
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Network Programmability and Automation covers designing, implementing, monitoring and operating networks using programmable interfaces on network devices versus the legacy (and soon-to-be obsolete) methods and protocols such as the Command Line Interface (CLI) and Simple Network Management Protocol (SNMP). It discusses the protocols, tools, techniques and technologies upon which Network Programmability is based.
Covering the fundamentals that a network engineer needs to transition to the software and programmability domains, the book opens with an introduction that lays the foundation by discussing the market trends and emerging technologies such as SDN, NFV and Cloud, and how network programmability skills are paramount for aligning oneself with these technologies. It provides network engineers with a solid foundation in Python programming and Linux in the context of network programmability and automation.
- The definitive guide to take students to expert level in network programmability and automation
- This book assumes no prior knowledge in programming, Linux, or any other subject, apart from basic knowledge of networks
- This book is closely aligned with the industry, building the correct and relevant skill set to be competitive in the market of tomorrow as a network engineer
- Both Cisco and Open Source platforms, tools, and technologies are covered
Introduction xxix
Part I Introduction
Chapter 1 The Network Programmability and Automation Ecosystem 1
First, a Few Definitions 2
Your Network Programmability and Automation Toolbox 14
Software and Network Engineers: The New Era 19
Part II Linux
Chapter 2 Linux Fundamentals 21
The Story of Linux 21
The Linux Boot Process 26
A Linux Command Shell Primer 28
Finding Help in Linux 31
Files and Directories in Linux 35
Input and Output Redirection 57
Archiving Utilities 67
Linux System Maintenance 73
Installing and Maintaining Software on Linux 94
Summary 118
Chapter 3 Linux Storage, Security, and Networks 119
Linux Storage 119
Linux Security 135
Linux Networking 158
Summary 181
Chapter 4 Linux Scripting 183
Regular Expressions and the grep Utility 184
The AWK Programming Language 193
The sed Utility 196
General Structure of Shell Scripts 203
Output and Input 207
Variables 215
Conditional Statements 223
Loops 232
The until-do Loop 237
Functions 238
Expect 242
Summary 246
Part III Python
Chapter 5 Python Fundamentals 249
Scripting Languages Versus Programming Languages 250
Network Programmability 253
Computer Science Concepts 255
Python Fundamentals 260
Summary 309
References 310
Chapter 6 Python Applications 311
Organizing the Development Environment 311
The virtualenv Tool 331
Python Modules 333
Python Applications 336
Summary 385
Part IV Transport
Chapter 7 HTTP and REST 387
HTTP Overview 387
The REST Framework 392
The HTTP Connection 394
HTTP Transactions 397
HTTP Messages 415
Resource Identification 431
Postman 436
HTTP and Bash 447
HTTP and Python 455
Summary 467
Chapter 8 Advanced HTTP 469
HTTP/1.1 Authentication 469
Transport Layer Security (TLS) and HTTPS 487
HTTP/2 503
Summary 508
Chapter 9 SSH 509
SSH Overview 509
Setting Up SSH 521
Enabling SSH on Cisco Devices 526
Secure File Transfer 540
Summary 551
References 551
Part V Encoding
Chapter 10 XML 553
XML Overview, History, and Usage 553
XML Syntax and Components 554
Making XML Valid 562
Navigating XML Documents 574
XML Stylesheet Language Transformations (XSLT) 578
Processing XML Files with Python 580
Summary 588
Chapter 11 JSON 591
JavaScript Object Notation (JSON) 591
JSON Schema Definition (JSD) 595
Summary 614
Chapter 12 YAML 615
YAML Structure 616
Handling YAML Data Using Python 626
Summary 637
Part VI Modeling
Chapter 13 YANG 639
A Data Modeling Primer 639
YANG Data Models 642
Types of YANG Modules 663
YANG Tools 673
Summary 688
Part VII Protocols
Chapter 14 NETCONF and RESTCONF 689
NETCONF 689
RESTCONF 739
Summary 779
Chapter 15 gRPC, Protobuf, and gNMI 781
Requirements for Efficient Transport 781
History and Principles of gRPC 782
gRPC as a Transport 784
The Protocol Buffers Data Format 786
Working with gRPC and Protobuf in Python 790
The gNMI Specification 798
The Anatomy of gNMI 799
Managing Network Elements with gNMI/gRPC 814
Summary 818
Chapter 16 Service Provider Programmability 819
The SDN Framework for Service Providers 819
Segment Routing (SR) 823
BGP Link State (BGP-LS) 843
Path Computation Element Protocol (PCEP) 859
Summary 880
Part VIII Programmability Applications
Chapter 17 Programming Cisco Platforms 881
API Classification 882
Network Platforms 883
Meraki 922
DNA Center 931
Collaboration Platforms 942
Summary 954
Chapter 18 Programming Non-Cisco Platforms 957
General Approaches to Programming Networks 957
Implementation Examples 962
Summary 987
Chapter 19 Ansible 989
Ansible Basics 989
Extending Ansible Capabilities 1003
Jinja2 Templates 1034
Using Ansible for Cisco IOS XE 1055
Using Ansible for Cisco IOS XR 1073
Using Ansible for Cisco NX-OS 1084
Using Ansible in Conjunction with NETCONF 1095
Summary 1108
Part IX Looking Ahead
Chapter 20 Looking Ahead 1109
Some Rules of Thumb 1109
What Does All This Mean for Your Career? 1118
9781587145148, TOC, 4/1/2021
Khaled Abuelenain, CCIE No. 27401 (R&S, SP), is currently the Consulting Director at Acuative, a Cisco Managed Services Master Partner. Khaled has spent the past 18 years designing, implementing, operating, and automating networks and clouds. He specializes in service provider technologies, SD-WAN, data center technologies, programmability, automation, and cloud architectures. Khaled is especially interested in Linux and OpenStack.
Khaled is a contributing author of the best-selling Cisco Press book Routing TCP/IP, Volume II, 2nd edition, by Jeff Doyle. He also blogs frequently on network programmability and automation on blogs.cisco.com. Khaled is also a member of the DevNet500 group, being one of the first 500 individuals in the world to become DevNet certified. Khaled lives in Riyadh, Saudi Arabia, and when not working or writing, he likes to run marathons and skydive. He can be reached at kabuelenain@gmail.com, on Twitter at @kabuelenain or on LinkedIn at linkedin.com/in/kabuelenain.
Jeff Doyle, CCIE No. 1919, is a Member of Technical Staff at Apstra. Specializing in IP routing protocols, complex BGP policy, SDN/NFV, data center fabrics, IBN, EVPN, MPLS, and IPv6, Jeff has designed or assisted in the design of large-scale IP and IPv6 service provider networks in 26 countries over 6 continents.
Jeff is the author of CCIE Professional Development: Routing TCP/IP, Volumes I and II and OSPF and IS-IS: Choosing an IGP for Large-Scale Networks; a co-author of Software-Defined Networking: Anatomy of OpenFlow; and an editor and contributing author of Juniper Networks Routers: The Complete Reference. Jeff is currently writing CCIE Professional Development: Switching TCP/IP. He also writes for Forbes and blogs for both Network World and Network Computing. Jeff is one of the founders of the Rocky Mountain IPv6 Task Force, is an IPv6 Forum Fellow, and serves on the executive board of the Colorado chapter of the Internet Society (ISOC).
Anton Karneliuk, CCIE No. 49412 (R&S, SP), is a Network Engineer and Manager at THG Hosting, responsible for the development, operation, and automation of networks in numerous data centers across the globe and the international backbone. Prior to joining THG, Anton was a team lead in Vodafone Group Network Engineering and Delivery, focusing on introduction of SDN and NFV projects in Germany. Anton has 15 years of extensive experience in design, rollout, operation, and optimization of large-scale service providers and converged networks, focusing on IP/MPLS, BGP, network security, and data center Clos fabrics built using EVPN/VXLAN. He also has several years of full-stack software development experience for network management and automation.
Anton holds a B.S. in telecommunications and an M.S. in information security from Belarusian State University of Informatics and Radio Electronics. You can find him actively blogging about network automation and running online training at Karneliuk. com. Anton lives with his wife in London.
Vinit Jain, CCIE No. 22854 (R&S, SP, Security & DC), is a Network Development Engineer at Amazon, managing the Amazon network backbone operations team. Previously, he worked as a technical leader with the Cisco Technical Assistance Center (TAC), providing escalation support in routing and data center technologies. Vinit is a speaker at various networking forums, including Cisco Live! events. He has co-authored several Cisco Press titles, such as Troubleshooting BGP, and Troubleshooting Cisco Nexus Switches and NX-OS, LISP Network Deployment and Troubleshooting, and has authored and co-authored several video courses, including BGP Troubleshooting, the CCNP DCCOR Complete Video Course, and the CCNP ENCOR Complete Video Course. In addition to his CCIEs, Vinit holds multiple certifications related to programming and databases. Vinit graduated from Delhi University in mathematics and earned a master's in information technology from Kuvempu University in India. Vinit can be found on Twitter as @VinuGenie.
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