Component description server networks contain two

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Component Description Server Networks contain two types of hosts: hosts that consume a service and hosts that provide a service. Hosts that provide a service are called servers. The following are some of the more common types of servers: File and Print Server - Provides file sharing and print sharing services. Application Server - Provides access to a shared network application (e.g., a database server that contains customer information). Directory Server - Handles user authentication. Also stores user credentials, permissions, and settings. Remote Access Server - Provides remote access to network resources. Web Server - Serves web pages and web content via HTTP. DNS Server - Uses the domain name service to map IP addresses to domain names. DHCP Server - Automatically configures network hosts with an IP address, subnet mask, DNS server, and default gateway. VoIP VoIP devices provide voice communication over a packet-switched network (an IP network). The most common VoIP device is an IP phone. Instead of using the standard public switched telephone network, IP phones connect to an Ethernet network using an RJ45 connection. Basic VoIP services include Skype or Google Voice. Businesses that use VoIP typically hire a third-party entity (e.g., Vonage or Jive) to set up the service and configure devices. Internet appliance An Internet appliance is a specialized device that performs a specific network role. The following are some common Internet appliances: Web proxy Content filter Malware scanner Internet appliances are typically more expensive than configuring a server to perform the same task. However, Internet appliances perform much better and have more features. Network attached storage (NAS) A NAS is a device that is optimized to provide a single service: file sharing. NAS devices range in price from several hundred to several thousand dollars. A NAS can be connected to a network and configured very easily. This makes them a great choice for most networks needing a file sharing service. A network adapter (also called a network interface card or NIC ) connects a host to the network medium. The network adapter is responsible for converting binary data into a format to be sent on the network medium. o A transceiver is responsible for converting digital data into digital signals to be sent on the medium. The type of signal the transceiver sends depends on the type of network. A fiber optic NIC sends light signals, an Ethernet NIC sends electronic signals on a wire, and a wireless NIC sends radio signals. To receive signals, the transceiver converts digital signals from the network to digital data for the PC. o A modem converts binary data to analog waves ( modulation ) on the sending end, and then converts the analog waves back to binary data ( demodulation ) on the receiving end.
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  • Spring '14
  • Computer network, Local area network, Network topology, Metropolitan area network

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