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What protocol is being used when a network administrator is testing IP connectivity between end nodes?
ICMP
UDP
ARP
DHCP
DNS
Internet Control Message Protocol (ICMP) is a layer 3 protocol that helps IP to fulfill different services. ICMP provides a messaging service and error reporting for IP. ICMP messages are carried in IP datagrams. Ping and Traceroute are two common tools that use ICMP. ARP is a protocol that resolves MAC addresses with known IP addresses. UDP is a layer 4 protocol used for transporting information in an unreliable manner. DHCP is used for dynamic host configuration. DNS resolves host names to IP address. For more information refer to: [Todd Lammle. - CCNA Routing and Switching Study Guide 2013, Chapter 3]
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