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ccna 200 301 booksmart film wiki.So in short, NTP's job is to prevent this "back to the future" thing from happening and to keep the network up and running - and that's really important!Domain Name ServiceThe Domain Name Service (DNS) is responsible for resolving host names ---------------- and especially Internet domain names, such as www.lammle.como DNS, by entering the IP address of the device you want to communicate with. IP addresses identify hosts on a network, as they do on the Internet. The original design of DNSwas to make our lives easier. Imagine a scenario where you want to migrate your Web page to another carrier. The IP address of the Web page changes, and no one else can know what the new IP address is. DNS allows you to use a domain name to assign an IP address, so you can change the IP address at any time and no one will notice.DNS is used to resolve FQDNs (Fully Qualified Domain Names) such as www.lammle.com todd.lammle.como An FQDN is a hierarchical system that locates a system based on a domain name identifier.If you wish to resolve the name todd , you must enter it in FQDN form: todd.lammle.com, or use a device (such as a PC or router) to add the suffix for you. On a Cisco router, for example, you can use the command ipdomain-namelammle.com, to add the lammle.com domain name to all requests. If this is not configured, you must enter the FQDN form to have DNS resolve the domain name.One DNS-related point is important: if you can ping through a device using the IP address, but cannot ping through using the device's FQDN, there may be some error in your DNS configuration.Dynamic Host Configuration Protocol / Bootstrap ProtocolDynamic Host Configuration Protocol (DHCP) is responsible for assigning IP addresses to hosts. It simplifies administration and can provide good service in network environments of all sizes. Any type of hardware device can be used as a DHCP server, including Cisco routers.DHCP differs from BootP (Bootstrap Protocol) in that BootP can also assign IP addresses to hosts, but the administrator must manually enter the hardware address of the host in the BootP table. You can think of DHCP as dynamic BootPo but remember that BootP can also send an operating system that the host can use to boot, a feature that DHCP does not have.