Data communication and physical network

Data communication and network foundation
TCP/IP Model
https://www.cnblogs.com/jmilkfan-fanguiju/p/10589771.html
https://www.vuln.cn/2041
IPv4 Subnet partition
https://zhuanlan.zhihu.com/p/86045845
https://blog.csdn.net/weixin_42269817/article/details/107281599
Network equipment management and basic configuration
https://max.book118.com/html/2020/1125/6005131013003025.shtm
https://www.likecs.com/show-55155.html
https://www.cnblogs.com/lilywhite/p/10667731.html
https://blog.csdn.net/weixin_30362083/article/details/99038554
IP Routing principle
https://blog.csdn.net/weixin_45614937/article/details/120924739
https://blog.csdn.net/GALi_233/article/details/111409687
https://zhuanlan.zhihu.com/p/338894712
Dynamic routing protocol 、 RIP
https://www.cnblogs.com/00huajiang/p/11358107.html
https://blog.51cto.com/yangshufan/1959692
https://blog.51cto.com/dengqi/1258780
https://blog.csdn.net/weixin_50355475/article/details/109468247
https://blog.csdn.net/qq_39689711/article/details/103751137
OSPF Basics
https://blog.csdn.net/qq_38265137/category_7126126.html
https://blog.csdn.net/qq_37200978/category_10098420.html
https://blog.csdn.net/qq_37200978/article/details/96480446
https://blog.csdn.net/qq_37200978/article/details/96501255
https://blog.csdn.net/qq_38265137/article/details/80390666
https://www.cnblogs.com/yinzhengjie/p/6711282.html
Ethernet layer 2 switching foundation
https://www.doc88.com/p-5791211246520.html?r=1
https://blog.csdn.net/erwangshi/article/details/45038837
https://zhuanlan.zhihu.com/p/339326516
Spanning tree foundation
https://www.cnblogs.com/yinzhengjie/p/6696676.html
https://blog.csdn.net/qq_18649781/article/details/85616517
VLAN Three layer interworking of  VLAN Communication principle
https://blog.51cto.com/wn2100/2130076
https://www.cnblogs.com/xieyunc/p/9784041.html
Ethernet port mirroring and link aggregation vlan Technical principle
https://www.docin.com/p-950584342.html
https://blog.csdn.net/GALi_233/article/details/111303301
https://max.book118.com/html/2017/0426/102464364.shtm
ACL Access control list
https://zhuanlan.zhihu.com/p/39191464
https://blog.csdn.net/ningmeng_bumeng/article/details/78614362
https://blog.csdn.net/weixin_43205333/article/details/86562151
NAT Network address translation
https://blog.csdn.net/hzhsan/article/details/45038265
https://zhuanlan.zhihu.com/p/157769590
https://zhuanlan.zhihu.com/p/26992935
Eudemon1000E-X Firewall Foundation
https://cshihong.blog.csdn.net/article/details/88548511
VRRP Skills topics
http://www.doczj.com/doc/ba3b220bdd3383c4bb4cd2fa-30.html
Eudemon1000E-X Firewall dual hot standby
https://cshihong.blog.csdn.net/article/details/88920294
VPN Basics
https://blog.51cto.com/gejielin/88639
https://service.tp-link.com.cn/detail_article_167.html
https://baijiahao.baidu.com/s?id=1604478882830545048&wfr=spider&for=pc
IPSecVPN Basics
https://blog.csdn.net/weixin_38387929/article/details/117463067
https://cshihong.blog.csdn.net/article/details/89423551
https://cshihong.blog.csdn.net/category_8755876_2.html
http://www.zylxyl.com/archives/2021/01/24/1291.html
Remote dial in VPN
https://www.doc88.com/p-4744723754130.html?r=1
https://wenku.baidu.com/view/51d58b3143323968011c9226.html
https://wenku.baidu.com/view/0d0f273b112de2bd960590c69ec3d5bbfc0ada40.html