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Welcome to my CCNA-CCNP wiki!

📢 This is the study notes of my personal CCNA & CCNP learning. Most of contents retrieved from the Youtube channel Jeremy's IT Lab.

Common Knowledge

Router Boost Order:

 Power on     Load Bootstrap     POST     Load IOS     Load startup configuration     Generate running configuration
+--------+->-+--------------+->-+----+->-+--------+->-+--------------------------+->-+------------------------------+
                  ROM            ROM       flash              NVRAM                              RAM

📎 Table-1 Name Abbrevations

Abbr.	Names	Purposes	Key-concepts
STP	Spanning Tree Protocol	Loop-free layer2 network	PortFast, BPDU guard/filter, Root/Loop guard
DTP	Dynamic Trunking Protocol	Automatically configure switchport states	Trunk/Access ports, native vlan
VTP	VLAN Trunking Protocol	Centralized VLANs management	v2 vs v3
CDP	CIsco Discovery Protocol	Exchange device info	Layer 2
NTP	Network Time Protocol	Syncronize time	Defualt stratum 8
NDP	Neighbor Discovering Protocol	Gather info required for IPv6 communication	5 ICMPv6 packet types
UDLD	Unidirectional Link Detection	Help STP to prevent layer2 loops	Unidirectional link

📎 Table-2 Well-know Multicast Addresses

Purpose	IPv4 Address	IPv6 Address
All nodes/hosts (like broadcast)	224.0.0.1	FF02::1
All routers	224.0.0.2	FF02::2
All OSPF routers	224.0.0.5	FF02::5
All OSPF DR/BDRs	224.0.0.6	FF02::6
All RIP routers	224.0.0.9	FF02::9
All EIGRP routers	224.0.0.10	FF02::A

📎 Table-3 Network Automation Tools

Name	Client-SRV	Op-Model	Protocol	Port	By-Lang	Use-Lang	Key Components
Ansible	agentless	push model	SSH	22	Python	YAML	Control Node: Inventory, Template, Variable, Playbook
Puppet	agent-based; agentless	pull model	HTTP(s)	8140	Ruby	Declarative lang	Puppet Master: Manifest , Templates
Chef	agent-based	pull model	HTTP(s)	10002	Ruby		Resources, Recipes, Cookbooks, Run-list

📎 Table-4 Special MAC Addresses

MAC Address	Destination for Protocols
01:00:0c:cc:cc:cc	CDP, VTP, DTP, PAgP, UDLD