1. Communications within a computer network rely on numerous components for
data to traverse from the initial sender of a message or file to the receiver at the
distant end of the communication path. In addition to the media that the data travels
across, the devices that guide the data packets through the network, and the
protocols that establish end-to-end connectivity and negotiate the communication,
network services play a critical role in providing the necessary addressing and name
resolution services. Describe the following services and their role in network
communications: ARP, DHCP, ICMP, SNMP, and DNS.
Address Resolution Protocol (ARP) works to assign the IP address of the device to
its’ MAC address.
ARP operates between the Data Link and Network layers of the
OSI model and provides the physical address for the frames to be sent.
Dynamic Host Configuration Protocol (DHCP) assigns an IP address from a scope of
available addresses using renewable leases and other network configuration
information when a device joins the network.
The Internet Control Message Protocol (ICMP) is a network maintenance protocol
used in a variety of message types, which are carried as IP payloads.
typically only used for network diagnostics by routers and switches to communicate
Simple Network Management Protocol (SNMP) is used in remote network
monitoring and management.
SNMP packets generally use UDP on ports 161 and
There are 3 versions of SNMP, but SNMPv3 adds full cryptographic security to