ecute any file and change other users' permissions). Note: other accounts may have root access, and the root account may not always have root access, depending on the sysadmin(22) (but root is the default account for root access).15. Bandwidth - the total amount of speed a network connection device (a modem, a network card, a mail pigeon etc') can get to. For example: I just bought a new modem. It has a bandwidth of 100Ks per second, meaning it can transfer up to 100Ks per second.When you use your network device to do something it will drain some of the bandwidth in order to do this operation.16. Client program - a program that connects to a certain service(3). Most client programs would know how to communicate with that service with or without the information it will receive from the daemon banner(4).Example: an Internet browser (such as Netscape) is a client program because it connects to port(2) 80, where the webserver daemon(1) is waiting for connections, and interacts with it in order to retrieve the file you're looking for. A browser has to know how to communicate with the webserver daemon (also referred to as HTTPD, HTTP Daemon. HTTP stands for Hyper Text(23) Transfer Protocol) in order to fulfill your requests.17. DNS server - a server that stores hostnames(10) and their IP addresses(11). Instead of having InterNIC's servers handle the entire planet, every ISP has a DNS server.When you type in a hostname and tell your modem to connect to it, your computer will perform an action called 'DNS Lookup'. In other words, it will ask your ISP's DNS server what is the appropriate IP address for the hostname you've typed in. If your ISP's DNS server will not know the answer, it will ask a higher-level DNS server. If the higher-level DNS server will not know the answer, it will ask an even higher-level DNS server, etc' etc' etc'. The highest level is InterNIC itself.If the DNS server knew the IP in the first place it would give it to you. ...
