Networking Infrastructure - Essay Example

iv) Not all communication channels preserve the order of messages sent to them. To deal with the possible loss of sequencing them, the protocol must make explicit provision for the receiver to allow the pieces to be put back together properly. v) Sometimes the process may be unable to accept long messages. This property leads to mechanisms for disassembling, transmitting, and then reassembling messages.(Computer networks- Andrew S. Tanenbaum) The above architecture consists of four areas: NC area (NCA), freely accessible area (FAA) for subscription purposes, protected provider's private area (PPA) for service-specific servers and global Internet (GI).

These areas are physically separated and IP traffic between them is run over a router with enabled packet-filtering controlled by the LS (log in server). The client will be connected to UNIX based server (i.e. the Sunblade machine). Setting up a DHCP server enables the user to manage the addresses and other network information for client computers on the private network. With the DHCP configured on the network, a client computer can simply indicate that it wants to use DHCP and the DHCP server can provide it's IP address, network mask, DNS server, router and other information needed to get up and running on the network.

With the DHCP, the user can simplify the initial network configuration that each client computer on the network needs to do. Later as the network evolves, the information can be easily updated, having changes automatically picked up clients when they restart their network interfaces.The minimum tools needed to set up DHCP server are:A firewall that allows requests for DHCP service.A configured /etc/dhcpd.conf file (For Sunblade machine)A running dhcp server daemonThe DNS (Domain Name System) is essentially a distributed database that translates hostnames into IP addresses and IP addresses back to host names.

The database also contains information related to each domain, such as how the domain is organized into zones, where to route mail for that domain and whom to contact with questions associated with the domain.To maintain the DNS server efficiently the following configuration tasks can be performed:Logging: The user can indicate what he wants to log and where log files reside.Remote server options: The user can set options for specific DNS servers to perform such tasks as blocking information from a bad server, setting encryption keys to use with a server or defining transfer methods.

In the above model the DNS, DHCP, Win server, mail and FTP all have public IP addresses.2. Network Address Translation allows a single device, such as a router, to act as agent between the Internet (or "public network") and a local (or "private") network. This means that only a single unique IP address is required to represent an entire group of computers to anything outside their network.The shortage of IP addresses is only one reason to use NAT. Two other good reasons