CCNA - TCP/IP Including TCP/IP Model

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For CCNA - TCP/IP Basics Including TCP/IP Model Vs OSI Model.

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What are 4 layers of TCP/IP stack?
 
Application (Layer 4) Transport (Host-to-host) (Layer 3) Internet (Layer 2) Network Access (Layer 1)
TCP/IP Application layer - Equivalent of OSI layer?
 
Top 3 layers - Application, Presentation and Session
TCP/IP Transport (Host-to-host) layer - Equivalent of OSI layer?
 
Transport
TCP/IP Internet layer - Equivalent of OSI layer?
 
Network
TCP/IP Network Access layer - Equivalent of OSI layer?
 
Data Link & Physical
What protocol to respond ARP request intended for a remote host?
 
Proxy ARP
Within which datagrams are ICMP packets encapsulated, IP or UDP?
 
IP
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