TCP/IP model

Question 1

Place the following protocols to their corresponding layers in the TCP/IP model:

ARP, SNMP, ICMP, Telnet, IP, TCP, UDP, HTTP

TCP/IP Model

Layer-5

Layer-4

Layer-3

Layer-2

Layer-1

In which layer does a router operate?

In which layer does a switch operate?

What are the essential security hardening steps of router and switches?

What are hardening steps specific to ARP, SNMP, ICMP, and Telnet protocols?