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7. Glossary
Terms Definitions
DNS
Domain Name System. Used for mapping a domain name to its corresponding IP
address and vice versa.
DoS
Denial of Service. They are attacks aimed at devices and networks with a connection
to the Internet. Their goal is to disable a device or network, so users do not have
access to network resources. The Zyxel device is pre-configured to automatically
detect and prevent all known DoS attacks.
Firewall
The firewall protects your devices and network from unauthorized access by hackers
on the Internet.
FTP
File Transfer Protocol. It is a communications protocol used for transferring files from a
server to a client on a computer network.
HTTP
Hypertext Transfer Protocol. It is an application layer protocol used for transferring
data over the World Wide Web.
HTTPS
Hypertext Transfer Protocol Secure. It is the combination of HTTP and SSL/TLS used
for establishing an encrypted connection over the World Wide Web.
IAD
Integrated Access Device. It is a device at the subscriber premises that is used for
providing access to the Internet.
IMAP
Internet Message Access Protocol. It is an Internet protocol used by e-mail clients to
retrieve messages from a mail server.
IPv4
Internet Protocol version 4. An Internet protocol that is used for assigning 32-bit
numeric IP addresses to devices on a computer network.
IPv6
Internet Protocol version 6. A newer version of IPv4. It is used for assigning 128-bit IP
alphanumeric addresses to devices on a computer network.
ICMPv6
Internet Control Message Protocol for IPv6. It is an implementation of ICMP for IPv6.
Used for performing error reporting.
LAN
Local Area Network. A computer network that connects computers or other devices in
a limited area such as homes or oces.
PBC
Push-button configuration.
PIN
Personal Identification Number.
POP3
Post Oce Protocol. An Internet protocol used by e-mail clients to retrieve email from
a mail server.
PPPoE
Point-to-Point Protocol over Ethernet. It is a network protocol used for managing how
data is transmitted over Ethernet networks.
PTM
Packet transfer mode. Supported by the VDSL2 standard. In PTM, packets are
encapsulated directly in the HDLC frames.
SIP
Session Initiation Protocol. A signalling standard that lets a network device, such as a
computer or IAD, communicate with another device.
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