Simple Network Management Protocol (SNMP)
collects and manipulates this valuable network information. It gathers data by
polling the devices on the network from a management station at fixed or random intervals, requiring them to disclose certain information. When all is well, SNMP receives
something called a baseline—a report delimiting the operational traits of a
This protocol can also stand as a watchdog over the network,
quickly notifying managers of any sudden turn of events. These network
watchdogs are called agents,and when aberrations occur, agents send an alert called a
trap to the management station.
Domain Name Service (DNS)
Domain Name Service (DNS) resolves host names, specifically Internet
names, like www.techsfair.comYou don’t have to use DNS; you can just type in the
IP address of any device you want to communicate with.
However, DNS was designed to make our lives easier. Also, what would happen if you
wanted to move your Web page to a different service provider? The IP
address would change and no one would know what the new one was. DNS
allows you to use a domain name to specify an IP address. You can change
the IP address as often as you want and no one will know the difference.
DNS is used to resolve Fully Qualified Domain Names
that can logically locate a system based on its domain identifier.
If you want to resolve the name “todd,” you either must type in the
FQDN of www.techsfair.comor have a device like a PC or router add the suffix
for you. For example, on a Cisco router, you can use the command ip domain-name lammle.com to append each request with the www.techsfair.com
domain. If you don’t do that, you’ll have to type in the FQDN to get the DNS to resolve the name.