1. Communications within a computer network rely on numerouscomponents for data to traverse from the initial sender of a message or fileto the receiver at the distant end of the communication path. In addition tothe media that the data travels across, the devices that guide the datapackets through the network, and the protocols that establish end-to-endconnectivity and negotiate the communication, network services play acritical role in providing the necessary addressing and name resolutionservices. Describe the following services and their role in networkcommunications: ARP, DHCP, ICMP, SNMP, and DNS.

2. Modern organizations rely on the Internet for information and researchnecessary to stay competitive but this access can come with significant riskif they don’t take the necessary steps to safeguard their internal resourcesfrom outside attackers. In this week’s reading, various types of firewalls andfirewall configurations were discussed. Describe the terms bastion host,DMZ, dual-homed firewall, screened host, and screened subnet and theirroles in firewall architectures.

3. Many organizations employ a mobile workforce and/or provide the optionof telework to their employees to allow them to work from home. In bothsituations, a secure means of accessing the corporate network remotelymust be provided. Discuss the four main tunneling protocols used toprovide virtual private network access between remote users and theircorporate network.