CMIT425 Assigment 4.docx - 1 Communications within a...

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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. They are typically only used for network diagnostics by routers and switches to communicate network conditions. Simple Network Management Protocol (SNMP) is used in remote network monitoring and management. SNMP packets generally use UDP on ports 161 and 162. There are 3 versions of SNMP, but SNMPv3 adds full cryptographic security to

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