Ccna routing and Switching Complete Study Guide

NTP Server

---

96

 

Chapter 3 

■

  Introduction to TCP/IP 

An important thing to remember about DNS is that if you can ping a device 

with an IP address but cannot use its FQDN, then you might have some 

type of DNS configuration failure.

Dynamic Host Configuration Protocol (DHCP)/Bootstrap  

Protocol (BootP)

Dynamic Host Configuration Protocol (DHCP) assigns IP addresses to hosts. It allows for 

easier administration and works well in small to very large network environments. Many 

types of hardware can be used as a DHCP server, including a Cisco router.

DHCP differs from BootP in that BootP assigns an IP address to a host but the host’s 

hardware address must be entered manually in a BootP table. You can think of DHCP as 

a dynamic BootP. But remember that BootP is also used to send an operating system that a 

host can boot from. DHCP can’t do that.

But there’s still a lot of information a DHCP server can provide to a host when the host 

is requesting an IP address from the DHCP server. Here’s a list of the most common types 

of information a DHCP server can provide:

 

■

IP address

 

■

Subnet mask

 

■

Domain name

 

■

Default gateway (routers)

 

■

DNS server address

 

■

WINS server address

f I g u r e   3 .10    DNS

What is the address for

lammle.com?

I don’t know. Let me check

with another server!

I know the answer!

DNS Root Server

lammle.com is

198.1.78.115

Get me to 198.1.78.115 ASAP!

DNS Server

lammle.com is:

198.1.78.115