Appendix A
Acronyms
133
DHCP
DHCP is an acronym for Dynamic Host Configuration Protocol. It is a protocol used for assigning dynamic IP
addresses to devices on a network.
DHCP Relay
DHCP Relay is used to forward and to transfer DHCP messages between the clients and the server when they are
not on the same subnet domain.
DHCP Snooping
DHCP Snooping is used to block intruder on the untrusted ports of the switch device when it tries to intervene by
injecting a bogus DHCP reply packet to a legitimate conversation between the DHCP client and server.
DNS
DNS is an acronym for Domain Name System. It stores and associates many types of information with domain
names. Most importantly, DNS translates human-friendly domain names and computer hostnames into computer-
friendly IP addresses. For example, the domain name www.example.com might translate to 192.168.0.1.
DoS
DoS is an acronym for Denial of Service. In a denial-of-service (DoS) attack, an attacker attempts to prevent
legitimate users from accessing information or services. By targeting at network sites or network connection, an
attacker may be able to prevent network users from accessing email, web sites, online accounts (banking, etc.), or
other services that rely on the affected computer.
DSCP
DSCP is an acronym for Differentiated Services Code Point. It is a field in the header of IP packets for packet
classification purposes.
EEE
EEE is an abbreviation for Energy Efficient Ethernet defined in IEEE 802.3az.
EPS
EPS is an abbreviation for Ethernet Protection Switching defined in ITU/T G.8031.
Ethernet Type
Ethernet Type, or EtherType, is a field in the Ethernet MAC header, defined by the Ethernet networking standard. It
is used to indicate which protocol is being transported in an Ethernet frame.
FTP
FTP is an acronym for File Transfer Protocol. It is a transfer protocol that uses the Transmission Control Protocol
(TCP) and provides file writing and reading. It also provides directory service and security features.
Fast Leave
Multicast snooping Fast Leave processing allows the switch to remove an interface from the forwarding-table entry
without first sending out group specific queries to the interface. The VLAN interface is pruned from the multicast tree
for the multicast group specified in the original leave message. Fast-leave processing ensures optimal bandwidth
management for all hosts on a switched network, even when multiple multicast groups are in use simultaneously. This
processing applies to IGMP and MLD.
HTTP
HTTP is an acronym for Hypertext Transfer Protocol. It is a protocol that used to transfer or convey information on
the World Wide Web (WWW). HTTP defines how messages are formatted and transmitted, and what actions Web
servers and browsers should take in response to various commands. For example, when you enter a URL in your
browser, this actually sends an HTTP command to the Web server directing it to fetch and transmit the requested
Web page. The other main standard that controls how the World Wide Web works is HTML, which covers how Web
pages are formatted and displayed.
Any Web server machine contains, in addition to the Web page files it can serve, an HTTP daemon, a program that is
designed to wait for HTTP requests and handle them when they arrive. The Web browser is an HTTP client, sending
requests to server machines. An HTTP client initiates a request by establishing a Transmission Control Protocol (TCP)
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