First cut at CERN case study

7. Case Studies/7. Case Studies.md

@@ -10,17 +10,20 @@ A good set of existing case studies from ARIN members can be found in
 Here is a Malaysian case study via
 [APNIC](https://blog.apnic.net/2023/03/17/telekom-malaysias-ipv6-readiness-journey/).
 
-This is an __open invitation__ to contribute a case study for this chapter.
-If you have deployed an IPv6 network, please write a short section
-with emphasis on what major choices you made, what worked well, and
-what problems you encountered. Even a summary in one paragraph would be helpful.
-Large and small enterprise networks, and large or small carrier networks,
-are all of interest. It isn't necessary to identify the particular network,
-if you prefer to keep that private. 
+This is an __open invitation__ to contribute a case study for this
+chapter. If you have deployed an IPv6 network, please write a short
+section with emphasis on what major choices you made, what worked well,
+and what problems you encountered. Even a summary in one paragraph would
+be helpful. Large and small enterprise networks, and large or small
+carrier networks, are all of interest. It isn't necessary to identify
+the particular network, if you prefer to keep that private.
 
-If you have already published such a description, just a pointer will be fine.
+If you have already published such a description, just a pointer will be
+fine.
 
-[How to contribute](https://github.com/becarpenter/book6/blob/main/1.%20Introduction%20and%20Foreword/How%20to%20contribute.md#how-to-contribute)  
+[How to contribute](https://github.com/becarpenter/book6/blob/main/1.%20Introduction%20and%20Foreword/How%20to%20contribute.md#how-to-contribute)
+
+## [CERN and the LHC](CERN%20and%20the%20LHC.md)
 
 <!-- Link lines generated automatically; do not delete -->
 

7. Case Studies/CERN and the LHC.md

@@ -0,0 +1,12 @@
+## CERN and the LHC
+
+The [CERN laboratory](https://www.cern.ch) and the [Worldwide LHC Computing Grid (WLCG)](https://home.cern/science/computing/grid) are large users of IPv6 for massive data transfers.
+Some recent statistics are shown here:<img src="./CERN-IPv6-Feb24.png" alt="Graph showing 644 Gb/s"> 
+
+(Image from the February 2024 data challenge at CERN.)
+
+The CERN site itself operates a classical IPv4 and IPv6 dual stack, and uses DHCPv6 for IPv6 address assignment.
+
+<!-- Link lines generated automatically; do not delete -->
+
+### [<ins>Chapter Contents</ins>](7.%20Case%20Studies.md)

Contents.md

@@ -60,6 +60,7 @@ and a [citation index](./Citex.md).
 * Basic Windows commands
 
 [7. Case Studies](7.%20Case%20Studies/7.%20Case%20Studies.md)
+* CERN and the LHC
 
 [8. Deployment Status](8.%20Deployment%20Status/8.%20Deployment%20Status.md)
 * Status