640-802 CCNA Study Guide - Elktech.org

Cisco 640-802 Exam
QUESTION NO: 379
In addition to assigning an IP address, Which of the following correctly describe regarding TCP/IP
stack configuration features can DHCP provide?(Choose three.)
A. Default gateway
B. DNS servers
C. FTP server
D. Helper address
E. Subnet mask
F. TFTP server
Answer: A,B,E
Explanation:
Default gateway refers to router default gateway, which is used to realize access between vlans.
When a router receives a destination unknown address packet, it will be sent to the default
gateway (such as a router's interface) if default gateway exists, otherwise the packet will be
discarded. DNS is Domain Name Server. The conversion between Domain names and IP
addresses is called domain analysis, and DNS is the server to process domain analysis. IP
addresses use network number and host number to mark network host, and only computers under
the same network number can intercommunicate "directly", computers with different networks may
intercommunicate only through Gateway. Thus IP networks are divided into smaller networks,
known as subnet. Subnet mask is used to determine whether two IP addresses are in the same
subnet, then only computers under the same subnet can intercommunicate "directly".
DHCP is used by workstations (hosts) to get initial configuration information, such as an IP
address, subnet mask, and default gateway upon bootup. Since each host needs an IP address to
communicate in an IP network, DHCP eases the administrative burden of manually configuring
each host with an IP address. Furthermore, if a host moves to a different IP subnet, it has to use a
different IP address than the one it was previously using. DHCP takes care of this automatically,
by allowing the host to choose an IP address in the correct IP subnet.
ReferencE.
“Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks”
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml#u
nderstanding
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